New board: ThinkPad R500 (experimental)

The ich9deblob and ich9gen utilities were modified, so that they
support reading and/or writing descriptor images where the GbE
region is not defined. These utilities were also re-factored
and tidied up a bit.

A quick was noticed during the course of this work, in that
Compenent 1 Density was being set to 8MiB constantly, even
on systems with 4MiB flash chips. Component 2 Density was
set statically to 2MiB. ich9gen now sets both to 4MiB or 8MiB,
depending on whether building the descriptor for a 4MiB or
8MiB ROM image.

There are still some ACPI bugs (see docs/hcl/r500.html), which
will have to be fixed upstream. TODO: get hw reg dumps from
a factory R500, and compare with the X200 or T400 dumps.

9 files changed, 288 insertions, 159 deletions

diff --git a/resources/utilities/coreboot-libre/deblob b/resources/utilities/coreboot-libre/deblob
index 65611b36..bc488bdc 100755
--- a/resources/utilities/coreboot-libre/deblob
+++ b/resources/utilities/coreboot-libre/deblob
@@ -156,6 +156,9 @@ rm -f \
 # Purpose unknown. TODO: investigate
 # ----------------------------------
 
+# <Stepan> francis7: util/broadcom/secimage/misc.c is a precalculated crc32 polynome table
+# <Stepan> It's just a standard crc32 implementation
+
 rm -f \
 "util/broadcom/secimage/misc.c"
 
diff --git a/resources/utilities/ich9deblob/src/demefactory.c b/resources/utilities/ich9deblob/src/demefactory.c
index 13e0f0bd..56618f5c 100644
--- a/resources/utilities/ich9deblob/src/demefactory.c
+++ b/resources/utilities/ich9deblob/src/demefactory.c
@@ -52,7 +52,7 @@ int main()
 	
 	/*
 	 * ------------------------------------------------------------------
-	 * Extract the descriptor and gbe regions from the factory.rom dump
+	 * Extract the descriptor region from the factory.rom dump
 	 * ------------------------------------------------------------------
 	 */
 	FILE* fp = NULL;
@@ -98,7 +98,8 @@ int main()
 	 */
 
 	// Disable the ME/TPM:
-	descriptorStruct = descriptorDisableMeTpm(descriptorStruct);
+	descriptorStruct = descriptorDisableMe(descriptorStruct);
+	descriptorStruct = descriptorDisableTpm(descriptorStruct);
 	
 	/* Host/CPU is allowed to read/write all regions. */
 	descriptorStruct = descriptorHostRegionsUnlocked(descriptorStruct);
@@ -111,7 +112,7 @@ int main()
 
 	/*
 	 * ------------------------------------------------------------------
-	 * Create the file with the modified descriptor and gbe inside
+	 * Create the file with the modified descriptor inside
 	 * ------------------------------------------------------------------
 	 */
 
@@ -122,7 +123,7 @@ int main()
 	
 	/*
 	 * ------------------------------------------------------------------
-	 * Generate ich9gen data (C code that will recreate the deblobbed descriptor+gbe from scratch)
+	 * Generate ich9gen data (C code that will recreate the deactivatedME descriptor from scratch)
 	 * ------------------------------------------------------------------
 	 */
 	/* Code for generating the Descriptor struct */
diff --git a/resources/utilities/ich9deblob/src/descriptor/descriptor.c b/resources/utilities/ich9deblob/src/descriptor/descriptor.c
index c627afa9..5a898131 100644
--- a/resources/utilities/ich9deblob/src/descriptor/descriptor.c
+++ b/resources/utilities/ich9deblob/src/descriptor/descriptor.c
@@ -28,14 +28,13 @@
 
 /*
  * ---------------------------------------------------------------------
- * Descriptor functions
+ * Descriptor related functions
  * ---------------------------------------------------------------------
  */
 
 /* Set the Host CPU / BIOS region to have read-write access on all regions */ 
 struct DESCRIPTORREGIONRECORD descriptorHostRegionsUnlocked(struct DESCRIPTORREGIONRECORD descriptorStruct)
-{	
-   /* FLMSTR1 (Host CPU / BIOS) */
+{
    descriptorStruct.masterAccessSection.flMstr1.fdRegionReadAccess = 0x1;
    descriptorStruct.masterAccessSection.flMstr1.biosRegionReadAccess = 0x1;
    descriptorStruct.masterAccessSection.flMstr1.meRegionReadAccess = 0x1;
@@ -46,14 +45,13 @@ struct DESCRIPTORREGIONRECORD descriptorHostRegionsUnlocked(struct DESCRIPTORREG
    descriptorStruct.masterAccessSection.flMstr1.meRegionWriteAccess = 0x1;
    descriptorStruct.masterAccessSection.flMstr1.gbeRegionWriteAccess = 0x1;
    descriptorStruct.masterAccessSection.flMstr1.pdRegionWriteAccess = 0x1;
-   
+
    return descriptorStruct;
 }
 
 /* Set the ME to have *no* read-write access on any region */
 struct DESCRIPTORREGIONRECORD descriptorMeRegionsForbidden(struct DESCRIPTORREGIONRECORD descriptorStruct)
-{	
-   /* FLMSTR2 (ME) */
+{
    descriptorStruct.masterAccessSection.flMstr2.fdRegionReadAccess = 0x0;
    descriptorStruct.masterAccessSection.flMstr2.biosRegionReadAccess = 0x0;
    descriptorStruct.masterAccessSection.flMstr2.meRegionReadAccess = 0x0;
@@ -64,92 +62,84 @@ struct DESCRIPTORREGIONRECORD descriptorMeRegionsForbidden(struct DESCRIPTORREGI
    descriptorStruct.masterAccessSection.flMstr2.meRegionWriteAccess = 0x0;
    descriptorStruct.masterAccessSection.flMstr2.gbeRegionWriteAccess = 0x0;
    descriptorStruct.masterAccessSection.flMstr2.pdRegionWriteAccess = 0x0;
-   
+
    return descriptorStruct;
 }
- 
-struct DESCRIPTORREGIONRECORD descriptorMePlatformRegionsRemoved(struct DESCRIPTORREGIONRECORD descriptorStruct)
+
+/* Disable (delete) the ME region */
+struct DESCRIPTORREGIONRECORD descriptorMeRegionRemoved(struct DESCRIPTORREGIONRECORD descriptorStruct)
 {
-	/* 
-	 * set number of regions from 4 -> 2 (0 based, so 4 means 5 and 2
-	 * means 3. We want 3 regions: descriptor, gbe and bios, in that order)
-	 */
-	descriptorStruct.flMaps.flMap0.NR = 2;
-	
-	/*
-	 * There are 5 regions. Since we set the number now to 3, that means
-	 * we need to disable 2 regions. ME and Platform will be disabled!
-	 * 
-	 * To disable a region, set the BASE to 1FFF. Shifted by FLREGIONBITSHIFT,
-	 * this puts the beginning of that region well outside the ROM image. 
-	 * Also set the LIMIT to 0.
-	 */
-	/* Disable (delete) the ME region */
 	descriptorStruct.regionSection.flReg2.BASE = 0x1FFF;
 	descriptorStruct.regionSection.flReg2.LIMIT = 0;
-	/* Disable (delete) the Platform region */
+
+	return descriptorStruct;
+}
+
+/* Disable (delete) the Platform region */
+struct DESCRIPTORREGIONRECORD descriptorPlatformRegionRemoved(struct DESCRIPTORREGIONRECORD descriptorStruct)
+{
 	descriptorStruct.regionSection.flReg4.BASE = 0x1FFF;
 	descriptorStruct.regionSection.flReg4.LIMIT = 0;
 	
 	return descriptorStruct;
 }
 
-struct DESCRIPTORREGIONRECORD descriptorDisableMeTpm(struct DESCRIPTORREGIONRECORD descriptorStruct)
+/* Disable the ME in ICHSTRAP0 and MCHSTRAP0 */
+struct DESCRIPTORREGIONRECORD descriptorDisableMe(struct DESCRIPTORREGIONRECORD descriptorStruct)
+{
+	descriptorStruct.ichStraps.ichStrap0.meDisable = 1;
+	descriptorStruct.mchStraps.mchStrap0.meDisable = 1;
+	
+	return descriptorStruct;
+}
+
+/* Disable the TPM in MCHSTRAP0 */
+struct DESCRIPTORREGIONRECORD descriptorDisableTpm(struct DESCRIPTORREGIONRECORD descriptorStruct)
 {
-	descriptorStruct.ichStraps.ichStrap0.meDisable = 1; /* Disable the ME in ICHSTRAP0 */
-	descriptorStruct.mchStraps.mchStrap0.meDisable = 1; /* Disable the ME in MCHSTRAP0 */
-	descriptorStruct.mchStraps.mchStrap0.tpmDisable = 1; /* Disable the TPM in MCHSTRAP0 */
+	descriptorStruct.mchStraps.mchStrap0.tpmDisable = 1;
 	
 	return descriptorStruct;
 }
 
+/* Relocate the Gbe region to begin at 4KiB (immediately after the flash descriptor) */
 struct DESCRIPTORREGIONRECORD descriptorMoveGbeToStart(struct DESCRIPTORREGIONRECORD descriptorStruct)
 {
-	/* Relocate the Gbe region to begin at 4KiB (immediately after the flash descriptor) */
 	descriptorStruct.regionSection.flReg3.BASE = DESCRIPTORREGIONSIZE >> FLREGIONBITSHIFT;
 	descriptorStruct.regionSection.flReg3.LIMIT = GBEREGIONSIZE_8K >> FLREGIONBITSHIFT;
 	
 	return descriptorStruct;
 }
 
+/* Disable (delete) the GbE region */
+struct DESCRIPTORREGIONRECORD descriptorGbeRegionRemoved(struct DESCRIPTORREGIONRECORD descriptorStruct)
+{
+	descriptorStruct.regionSection.flReg3.BASE = 0x1FFF;
+	descriptorStruct.regionSection.flReg3.LIMIT = 0;
+	
+	return descriptorStruct;
+}
+
+/* BIOS Region begin after descriptor+gbe at first 12KiB, fills the rest of the image */
 struct DESCRIPTORREGIONRECORD descriptorBiosRegionFillImageAfterGbe(struct DESCRIPTORREGIONRECORD descriptorStruct, unsigned int romSize)
 {
-	/* BIOS Region begin after descriptor+gbe at first 12KiB, fills the rest of the image */
 	descriptorStruct.regionSection.flReg1.BASE = (DESCRIPTORREGIONSIZE + GBEREGIONSIZE_8K) >> FLREGIONBITSHIFT;
 	descriptorStruct.regionSection.flReg1.LIMIT = (romSize >> FLREGIONBITSHIFT) - 1;
 	
 	return descriptorStruct;
 }
- 
-struct DESCRIPTORREGIONRECORD deblobbedDescriptorStructFromFactory(struct DESCRIPTORREGIONRECORD descriptorStruct, unsigned int romSize)
+
+/* BIOS Region begin after descriptor at first 4KiB, fills the rest of the image */
+struct DESCRIPTORREGIONRECORD descriptorBiosRegionFillImageAfterDescriptor(struct DESCRIPTORREGIONRECORD descriptorStruct, unsigned int romSize)
+{
+	descriptorStruct.regionSection.flReg1.BASE = DESCRIPTORREGIONSIZE >> FLREGIONBITSHIFT;
+	descriptorStruct.regionSection.flReg1.LIMIT = (romSize >> FLREGIONBITSHIFT) - 1;
+	
+	return descriptorStruct;
+}
+
+/* Set OEM string to "LIBERATE" */
+struct DESCRIPTORREGIONRECORD descriptorOemString(struct DESCRIPTORREGIONRECORD descriptorStruct)
 {
-	// Disable the ME/TPM and remove the ME/Platform regions:
-	descriptorStruct = descriptorMePlatformRegionsRemoved(descriptorStruct);
-	descriptorStruct = descriptorDisableMeTpm(descriptorStruct);
-
-	// Move GbE region to the start of the image (after the descriptor)
-	descriptorStruct = descriptorMoveGbeToStart(descriptorStruct);
-
-	/* BIOS region fills the remaining space */
-	descriptorStruct = descriptorBiosRegionFillImageAfterGbe(descriptorStruct, romSize);
-	 
-	/*
-	 * Set region read/write access
-	 * -------------
-	 */
-	 
-	/* Host/CPU is allowed to read/write all regions. */
-	descriptorStruct = descriptorHostRegionsUnlocked(descriptorStruct);
-	/* The ME is disallowed read-write access to all regions
-	 * (this is probably redundant, since the ME is already removed from libreboot) */
-	descriptorStruct = descriptorMeRegionsForbidden(descriptorStruct);
-	
-	/*
-	 * Miscellaneous
-	 * -------------
-	 */
-	
-	/* Set OEM string to "LIBERATE" */
 	descriptorStruct.oemSection.magicString[0] = 0x4C;
 	descriptorStruct.oemSection.magicString[1] = 0x49;
 	descriptorStruct.oemSection.magicString[2] = 0x42;
@@ -158,6 +148,100 @@ struct DESCRIPTORREGIONRECORD deblobbedDescriptorStructFromFactory(struct DESCRI
 	descriptorStruct.oemSection.magicString[5] = 0x41;
 	descriptorStruct.oemSection.magicString[6] = 0x54;
 	descriptorStruct.oemSection.magicString[7] = 0x45;
+
+	return descriptorStruct;
+} 
+
+/* Check whether a GbE region is defined by this descriptor.
+ * Not thorough, but should work in most cases */
+int descriptorDefinesGbeRegion(struct DESCRIPTORREGIONRECORD descriptorStruct)
+{
+	if (
+		(descriptorStruct.regionSection.flReg3.BASE == 0x1FFF || descriptorStruct.regionSection.flReg3.BASE == 0xFFF)
+		&&
+		(descriptorStruct.regionSection.flReg3.LIMIT == 0)
+	)
+		return 0; /* has no GbE region */
+	else if (
+		descriptorStruct.ichStraps.ichStrap0.integratedGbe == 0
+		||
+		descriptorStruct.ichStraps.ichStrap0.lanPhy == 0
+	)
+		return 0; /* has no GbE region */
+	else
+		return 1; /* has a GbE region */
+}
+
+/* Configure the BIOS and GbE regions, as required by libreboot.
+ * Enable or disable the GbE region, based on what's in the descriptor */
+struct DESCRIPTORREGIONRECORD librebootSetGbeBiosDescriptorRegions(struct DESCRIPTORREGIONRECORD descriptorStruct, unsigned int romSize)
+{
+	if (descriptorDefinesGbeRegion(descriptorStruct))
+	{
+		/* 
+		 * set number of regions from 4 -> 2 (0 based, so 4 means 5 and 2
+		 * means 3. We want 3 regions: descriptor, gbe and bios, in that order)
+		 */
+		descriptorStruct.flMaps.flMap0.NR = 2;
+		/* Move GbE region to the start of the image (after the descriptor) */
+		descriptorStruct = descriptorMoveGbeToStart(descriptorStruct);
+		/* BIOS region fills the remaining space */
+		descriptorStruct = descriptorBiosRegionFillImageAfterGbe(descriptorStruct, romSize);
+
+		/* GbE region means that an Intel NIC is to be present */
+		descriptorStruct.ichStraps.ichStrap0.integratedGbe = 0x1;
+		descriptorStruct.ichStraps.ichStrap0.lanPhy = 0x1;
+	}
+	else {
+		/* 
+		 * set number of regions from 4 -> 2 (0 based, so 4 means 5 and 1
+		 * means 2. We want 2 regions: descriptor and bios, in that order)
+		 */
+		descriptorStruct.flMaps.flMap0.NR = 1;
+		/* Disable the GbE region */
+		descriptorStruct = descriptorGbeRegionRemoved(descriptorStruct);
+		/* BIOS region fills the remaining space, after the descriptor */
+		descriptorStruct = descriptorBiosRegionFillImageAfterDescriptor(descriptorStruct, romSize);
+
+		/* No GbE region means that an onboard NIC is still used, but it's discrete (eg Broadcom) */
+		descriptorStruct.ichStraps.ichStrap0.integratedGbe = 0x0;
+		descriptorStruct.ichStraps.ichStrap0.lanPhy = 0x0;
+	}
+
+	return descriptorStruct;
+}
+
+uint8_t componentDensity(unsigned int romSizeInBytes)
+{
+	/* component density, see Component Section Record. page 848 in the datasheet */
+	switch (romSizeInBytes)
+	{
+		case ROMSIZE_512KB: return 0;
+		case ROMSIZE_1MB: return 1;
+		case ROMSIZE_2MB: return 2;
+		case ROMSIZE_4MB: return 3;
+		case ROMSIZE_8MB: return 4;
+		case ROMSIZE_16MB: return 5;
+		default: return 0x7; /* reserved value */
+	}
+}
+
+/* From a factory.rom image, create a modified descriptor region, suitable
+ * for use by the libreboot project */
+struct DESCRIPTORREGIONRECORD librebootDescriptorStructFromFactory(struct DESCRIPTORREGIONRECORD descriptorStruct, unsigned int romSize)
+{
+	/* Enable or disable the GbE region, from what's in the descriptor */
+	descriptorStruct = librebootSetGbeBiosDescriptorRegions(descriptorStruct, romSize);
+
+	/* Disable the ME/TPM and remove the ME/Platform regions: */
+	descriptorStruct = descriptorMeRegionRemoved(descriptorStruct);
+	/* Disable the ME/TPM and remove the ME/Platform regions: */
+	descriptorStruct = descriptorPlatformRegionRemoved(descriptorStruct);
+	
+	/* Disable the ME itself, so that it doesn't try to start when this descriptor is in use */
+	descriptorStruct = descriptorDisableMe(descriptorStruct);
+	/* Also disable the TPM, by default */
+	descriptorStruct = descriptorDisableTpm(descriptorStruct);
 	
 	return descriptorStruct;
 }
@@ -192,13 +276,7 @@ int notCreatedHFileForDescriptorCFile(char* outFileName, char* cFileName)
 	fprintf(fp, "#include <string.h>\n");
 	fprintf(fp, "#include \"../descriptor/descriptor.h\"\n\n");
 	
-	fprintf(fp, "/* ROM image sizes in bytes */\n");
-	fprintf(fp, "#define ROMSIZE_4MB 0x400000\n");
-	fprintf(fp, "#define ROMSIZE_8MB 0x800000\n\n");
-	
-	fprintf(fp, "struct DESCRIPTORREGIONRECORD generatedDescriptorStruct(unsigned int romSize);\n");
-	fprintf(fp, "struct DESCRIPTORREGIONRECORD generatedDescriptorStructRom4M();\n");
-	fprintf(fp, "struct DESCRIPTORREGIONRECORD generatedDescriptorStructRom8M();\n");
+	fprintf(fp, "struct DESCRIPTORREGIONRECORD generatedDescriptorStruct(unsigned int romSize, int hasGbe);\n");
 	
 	fprintf(fp, "#endif\n");
 	
@@ -234,7 +312,7 @@ int notCreatedCFileFromDescriptorStruct(struct DESCRIPTORREGIONRECORD descriptor
 	fprintf(fp, "/* Generate a 4KiB Descriptor struct, with default values. */\n");
 	fprintf(fp, "/* Read ../descriptor/descriptor.h for an explanation of the default values used here */\n\n");
 	
-	fprintf(fp, "struct DESCRIPTORREGIONRECORD generatedDescriptorStruct(unsigned int romSize)\n");
+	fprintf(fp, "struct DESCRIPTORREGIONRECORD generatedDescriptorStruct(unsigned int romSize, int hasGbe)\n");
 	fprintf(fp, "{\n");
 	fprintf(fp, "    int i;\n");
 	fprintf(fp, "    struct DESCRIPTORREGIONRECORD descriptorStruct;\n");
@@ -250,7 +328,8 @@ int notCreatedCFileFromDescriptorStruct(struct DESCRIPTORREGIONRECORD descriptor
 	fprintf(fp, "    descriptorStruct.flMaps.flMap0.NC = 0x%01x;\n", descriptorStruct.flMaps.flMap0.NC);
 	fprintf(fp, "    descriptorStruct.flMaps.flMap0.reserved1 = 0x%02x;\n", descriptorStruct.flMaps.flMap0.reserved1);
 	fprintf(fp, "    descriptorStruct.flMaps.flMap0.FRBA = 0x%02x;\n", descriptorStruct.flMaps.flMap0.FRBA);
-	fprintf(fp, "    descriptorStruct.flMaps.flMap0.NR = 0x%01x; /* see ../descriptor/descriptor.c */\n", descriptorStruct.flMaps.flMap0.NR);
+	fprintf(fp, "    /* descriptorStruct.flMaps.flMap0.NR = 0x%01x; */ /* see ../descriptor/descriptor.c */\n", descriptorStruct.flMaps.flMap0.NR);
+	fprintf(fp, "    descriptorStruct.flMaps.flMap0.NR = hasGbe ? 0x2 : 0x1; /* see ../descriptor/descriptor.c */\n");
 	fprintf(fp, "    descriptorStruct.flMaps.flMap0.reserved2 = 0x%02x;\n", descriptorStruct.flMaps.flMap0.reserved2);
 	fprintf(fp, "    /* FLMAP1 */\n");
 	fprintf(fp, "    descriptorStruct.flMaps.flMap1.FMBA = 0x%02x;\n", descriptorStruct.flMaps.flMap1.FMBA);
@@ -266,8 +345,10 @@ int notCreatedCFileFromDescriptorStruct(struct DESCRIPTORREGIONRECORD descriptor
 	/* Component Section Record */
 	fprintf(fp, "    /* Component Section Record */\n");
 	fprintf(fp, "    /* FLCOMP */\n");
-	fprintf(fp, "    descriptorStruct.componentSection.flcomp.component1Density = 0x%01x;\n", descriptorStruct.componentSection.flcomp.component1Density);
-	fprintf(fp, "    descriptorStruct.componentSection.flcomp.component2Density = 0x%01x;\n", descriptorStruct.componentSection.flcomp.component2Density);
+	fprintf(fp, "    /* descriptorStruct.componentSection.flcomp.component1Density = 0x%01x; */\n", descriptorStruct.componentSection.flcomp.component1Density);
+	fprintf(fp, "    /* descriptorStruct.componentSection.flcomp.component2Density = 0x%01x; */\n", descriptorStruct.componentSection.flcomp.component2Density);
+	fprintf(fp, "    descriptorStruct.componentSection.flcomp.component1Density = componentDensity(romSize);\n");
+	fprintf(fp, "    descriptorStruct.componentSection.flcomp.component2Density = componentDensity(romSize);\n");
 	fprintf(fp, "    descriptorStruct.componentSection.flcomp.reserved1 = 0x%01x;\n", descriptorStruct.componentSection.flcomp.reserved1);
 	fprintf(fp, "    descriptorStruct.componentSection.flcomp.reserved2 = 0x%02x;\n", descriptorStruct.componentSection.flcomp.reserved2);
 	fprintf(fp, "    descriptorStruct.componentSection.flcomp.reserved3 = 0x%01x;\n", descriptorStruct.componentSection.flcomp.reserved3);
@@ -305,7 +386,7 @@ int notCreatedCFileFromDescriptorStruct(struct DESCRIPTORREGIONRECORD descriptor
 	fprintf(fp, "    descriptorStruct.regionSection.flReg0.reserved2 = 0x%01x;\n", descriptorStruct.regionSection.flReg0.reserved2);
 	fprintf(fp, "    /* FLREG1 (BIOS) */\n");
 	fprintf(fp, "    /* descriptorStruct.regionSection.flReg1.BASE = 0x%04x; */\n", descriptorStruct.regionSection.flReg1.BASE);
-	fprintf(fp, "    descriptorStruct.regionSection.flReg1.BASE = (DESCRIPTORREGIONSIZE + GBEREGIONSIZE_8K) >> FLREGIONBITSHIFT; /* see ../descriptor/descriptor.c */\n");
+	fprintf(fp, "    descriptorStruct.regionSection.flReg1.BASE = (DESCRIPTORREGIONSIZE + (hasGbe ? GBEREGIONSIZE_8K : 0)) >> FLREGIONBITSHIFT; /* see ../descriptor/descriptor.c */\n");
 	fprintf(fp, "    descriptorStruct.regionSection.flReg1.reserved1 = 0x%01x;\n", descriptorStruct.regionSection.flReg1.reserved1);
 	fprintf(fp, "    /* descriptorStruct.regionSection.flReg1.LIMIT = 0x%04x; */\n", descriptorStruct.regionSection.flReg1.LIMIT);
 	fprintf(fp, "    descriptorStruct.regionSection.flReg1.LIMIT = ((romSize >> FLREGIONBITSHIFT) - 1); /* see ../descriptor/descriptor.c */\n");
@@ -317,10 +398,10 @@ int notCreatedCFileFromDescriptorStruct(struct DESCRIPTORREGIONRECORD descriptor
 	fprintf(fp, "    descriptorStruct.regionSection.flReg2.reserved2 = 0x%01x;\n", descriptorStruct.regionSection.flReg2.reserved2);
 	fprintf(fp, "    /* FLREG3 (Gbe) */\n");
 	fprintf(fp, "    /* descriptorStruct.regionSection.flReg3.BASE = 0x%04x; */\n", descriptorStruct.regionSection.flReg3.BASE);
-	fprintf(fp, "    descriptorStruct.regionSection.flReg3.BASE = DESCRIPTORREGIONSIZE >> FLREGIONBITSHIFT; /* see ../descriptor/descriptor.c */\n");
+	fprintf(fp, "    descriptorStruct.regionSection.flReg3.BASE = hasGbe ? (DESCRIPTORREGIONSIZE >> FLREGIONBITSHIFT) : 0x1fff; /* see ../descriptor/descriptor.c */\n");
 	fprintf(fp, "    descriptorStruct.regionSection.flReg3.reserved1 = 0x%01x;\n", descriptorStruct.regionSection.flReg3.reserved1);
 	fprintf(fp, "    /* descriptorStruct.regionSection.flReg3.LIMIT = 0x%04x; */\n", descriptorStruct.regionSection.flReg3.LIMIT);
-	fprintf(fp, "    descriptorStruct.regionSection.flReg3.LIMIT = GBEREGIONSIZE_8K >> FLREGIONBITSHIFT; /* see ../descriptor/descriptor.c */\n");
+	fprintf(fp, "    descriptorStruct.regionSection.flReg3.LIMIT = hasGbe ? (GBEREGIONSIZE_8K >> FLREGIONBITSHIFT) : 0x0000; /* see ../descriptor/descriptor.c */\n");
 	fprintf(fp, "    descriptorStruct.regionSection.flReg3.reserved2 = 0x%01x;\n", descriptorStruct.regionSection.flReg3.reserved2);
 	fprintf(fp, "    /* FLREG4 (Platform) */\n");
 	fprintf(fp, "    descriptorStruct.regionSection.flReg4.BASE = 0x%04x; /* see ../descriptor/descriptor.c */\n", descriptorStruct.regionSection.flReg4.BASE);
@@ -411,8 +492,8 @@ int notCreatedCFileFromDescriptorStruct(struct DESCRIPTORREGIONRECORD descriptor
 	fprintf(fp, "    descriptorStruct.ichStraps.ichStrap0.bmcMode = 0x%01x;\n", descriptorStruct.ichStraps.ichStrap0.bmcMode);
 	fprintf(fp, "    descriptorStruct.ichStraps.ichStrap0.tripPointSelect = 0x%01x;\n", descriptorStruct.ichStraps.ichStrap0.tripPointSelect);
 	fprintf(fp, "    descriptorStruct.ichStraps.ichStrap0.reserved2 = 0x%01x;\n", descriptorStruct.ichStraps.ichStrap0.reserved2);
-	fprintf(fp, "    descriptorStruct.ichStraps.ichStrap0.integratedGbe = 0x%01x;\n", descriptorStruct.ichStraps.ichStrap0.integratedGbe);
-	fprintf(fp, "    descriptorStruct.ichStraps.ichStrap0.lanPhy = 0x%01x;\n", descriptorStruct.ichStraps.ichStrap0.lanPhy);
+	fprintf(fp, "    descriptorStruct.ichStraps.ichStrap0.integratedGbe = hasGbe ? 0x1 : 0x0;\n");
+	fprintf(fp, "    descriptorStruct.ichStraps.ichStrap0.lanPhy = hasGbe ? 0x1 : 0x0;\n");
 	fprintf(fp, "    descriptorStruct.ichStraps.ichStrap0.reserved3 = 0x%01x;\n", descriptorStruct.ichStraps.ichStrap0.reserved3);
 	fprintf(fp, "    descriptorStruct.ichStraps.ichStrap0.dmiRequesterId = 0x%01x;\n", descriptorStruct.ichStraps.ichStrap0.dmiRequesterId);
 	fprintf(fp, "    descriptorStruct.ichStraps.ichStrap0.smBus2Address = 0x%02x;\n", descriptorStruct.ichStraps.ichStrap0.smBus2Address);
@@ -520,16 +601,6 @@ int notCreatedCFileFromDescriptorStruct(struct DESCRIPTORREGIONRECORD descriptor
 	fprintf(fp, "    return descriptorStruct;\n");
 	fprintf(fp, "}\n\n");
 	
-	fprintf(fp, "struct DESCRIPTORREGIONRECORD generatedDescriptorStructRom4M()\n");
-	fprintf(fp, "{\n");
-	fprintf(fp, "    return generatedDescriptorStruct(ROMSIZE_4MB);\n");
-	fprintf(fp, "}\n\n");
-	
-	fprintf(fp, "struct DESCRIPTORREGIONRECORD generatedDescriptorStructRom8M()\n");
-	fprintf(fp, "{\n");
-	fprintf(fp, "    return generatedDescriptorStruct(ROMSIZE_8MB);\n");
-	fprintf(fp, "}\n\n");
-	
 	/* ------------------------------ */
 	
 	fclose(fp); /* Always close the file when done. */
diff --git a/resources/utilities/ich9deblob/src/descriptor/descriptor.h b/resources/utilities/ich9deblob/src/descriptor/descriptor.h
index 47a619c4..64e381c9 100644
--- a/resources/utilities/ich9deblob/src/descriptor/descriptor.h
+++ b/resources/utilities/ich9deblob/src/descriptor/descriptor.h
@@ -46,6 +46,14 @@
 /* size of the descriptor in bytes */
 #define DESCRIPTORREGIONSIZE 0x1000
 
+/* ROM image sizes in bytes */
+#define ROMSIZE_512KB 0x80000
+#define ROMSIZE_1MB 0x100000
+#define ROMSIZE_2MB 0x200000
+#define ROMSIZE_4MB 0x400000
+#define ROMSIZE_8MB 0x800000
+#define ROMSIZE_16MB 0x1000000
+
 /* 
  * Related to the flash descriptor
  * bits 12(0xC)-24(0x18) are represented for words found in the flash descriptor
@@ -305,11 +313,19 @@ struct DESCRIPTORREGIONRECORD
  
 struct DESCRIPTORREGIONRECORD descriptorHostRegionsUnlocked(struct DESCRIPTORREGIONRECORD descriptorStruct);
 struct DESCRIPTORREGIONRECORD descriptorMeRegionsForbidden(struct DESCRIPTORREGIONRECORD descriptorStruct);
-struct DESCRIPTORREGIONRECORD descriptorMePlatformRegionsRemoved(struct DESCRIPTORREGIONRECORD descriptorStruct);
-struct DESCRIPTORREGIONRECORD descriptorDisableMeTpm(struct DESCRIPTORREGIONRECORD descriptorStruct);
+struct DESCRIPTORREGIONRECORD descriptorMeRegionRemoved(struct DESCRIPTORREGIONRECORD descriptorStruct);
+struct DESCRIPTORREGIONRECORD descriptorPlatformRegionRemoved(struct DESCRIPTORREGIONRECORD descriptorStruct);
+struct DESCRIPTORREGIONRECORD descriptorDisableMe(struct DESCRIPTORREGIONRECORD descriptorStruct);
+struct DESCRIPTORREGIONRECORD descriptorDisableTpm(struct DESCRIPTORREGIONRECORD descriptorStruct);
 struct DESCRIPTORREGIONRECORD descriptorMoveGbeToStart(struct DESCRIPTORREGIONRECORD descriptorStruct);
+struct DESCRIPTORREGIONRECORD descriptorGbeRegionRemoved(struct DESCRIPTORREGIONRECORD descriptorStruct);
 struct DESCRIPTORREGIONRECORD descriptorBiosRegionFillImageAfterGbe(struct DESCRIPTORREGIONRECORD descriptorStruct, unsigned int romSize);
-struct DESCRIPTORREGIONRECORD deblobbedDescriptorStructFromFactory(struct DESCRIPTORREGIONRECORD descriptorStruct, unsigned int romSize);
+struct DESCRIPTORREGIONRECORD descriptorBiosRegionFillImageAfterDescriptor(struct DESCRIPTORREGIONRECORD descriptorStruct, unsigned int romSize);
+struct DESCRIPTORREGIONRECORD descriptorOemString(struct DESCRIPTORREGIONRECORD descriptorStruct);
+int descriptorDefinesGbeRegion(struct DESCRIPTORREGIONRECORD descriptorStruct);
+struct DESCRIPTORREGIONRECORD librebootSetGbeBiosDescriptorRegions(struct DESCRIPTORREGIONRECORD descriptorStruct, unsigned int romSize);
+uint8_t componentDensity(unsigned int romSizeInBytes);
+struct DESCRIPTORREGIONRECORD librebootDescriptorStructFromFactory(struct DESCRIPTORREGIONRECORD descriptorStruct, unsigned int romSize);
 int notCreatedHFileForDescriptorCFile(char* outFileName, char* cFileName);
 int notCreatedCFileFromDescriptorStruct(struct DESCRIPTORREGIONRECORD descriptorStruct, char* outFileName, char* headerFileName);
 void printDescriptorRegionLocations(struct DESCRIPTORREGIONRECORD descriptorStruct, char* romName);
diff --git a/resources/utilities/ich9deblob/src/ich9deblob.c b/resources/utilities/ich9deblob/src/ich9deblob.c
index 72ade04f..97db6280 100644
--- a/resources/utilities/ich9deblob/src/ich9deblob.c
+++ b/resources/utilities/ich9deblob/src/ich9deblob.c
@@ -5,7 +5,7 @@
  * Purpose: disable and remove the ME from ich9m/gm45 systems in coreboot.
  *
  *  Copyright (C) 2014 Steve Shenton <sgsit@libreboot.org>
- *                     Francis Rowe <info@gluglug.org.uk>
+ *  Copyright (C) 2014,2015 Francis Rowe <info@gluglug.org.uk>
  *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -58,6 +58,7 @@ int main()
 	
 	char* romFilename = "factory.rom";
 	char* descriptorGbeFilename = "deblobbed_descriptor.bin";
+	char* descriptorNoGbeFilename = "deblobbed_4kdescriptor.bin";
 	
 	unsigned int bufferLength;
 	unsigned int romSize;
@@ -99,22 +100,25 @@ int main()
 	}
 	printf("\ndescriptor region read successfully\n");
 	
-	gbeRegionStart = descriptorStruct.regionSection.flReg3.BASE << FLREGIONBITSHIFT;
-
-	/*
-	 * Set offset so that we can read the data from
-	 * the gbe region
-	 */
-	fseek(fp, gbeRegionStart, SEEK_SET);
-	/* Read the gbe data from the factory.rom and put it in factoryGbeBuffer8k */
-	bufferLength = fread(gbeBuffer8k, 1, GBEREGIONSIZE_8K, fp);
-	if (GBEREGIONSIZE_8K != bufferLength)
+	if (descriptorDefinesGbeRegion(descriptorStruct))
 	{
-		printf("\nerror: could not read GBe region from %s (%i) bytes read\n", romFilename, bufferLength);
-		fclose(fp);
-		return 1;
+		gbeRegionStart = descriptorStruct.regionSection.flReg3.BASE << FLREGIONBITSHIFT;
+
+		/*
+		 * Set offset so that we can read the data from
+		 * the gbe region
+		 */
+		fseek(fp, gbeRegionStart, SEEK_SET);
+		/* Read the gbe data from the factory.rom and put it in factoryGbeBuffer8k */
+		bufferLength = fread(gbeBuffer8k, 1, GBEREGIONSIZE_8K, fp);
+		if (GBEREGIONSIZE_8K != bufferLength)
+		{
+			printf("\nerror: could not read GBe region from %s (%i) bytes read\n", romFilename, bufferLength);
+			fclose(fp);
+			return 1;
+		}
+		printf("\ngbe (8KiB) region read successfully\n");
 	}
-	printf("\ngbe (8KiB) region read successfully\n");
 
 	fseek(fp, 0L, SEEK_END);
 	romSize = ftell(fp);
@@ -124,7 +128,9 @@ int main()
 	
 	/* Debugging (before modification) */
 	printDescriptorRegionLocations(descriptorStruct, "Original");
-	printGbeChecksumDataFromStruct8k(gbeStruct8k, "Original");
+	if (descriptorDefinesGbeRegion(descriptorStruct)) 
+		printGbeChecksumDataFromStruct8k(gbeStruct8k, "Original");
+	else printf("NO GBE REGION\n");
 	
 	/*
 	 * ------------------------------------------------------------------
@@ -133,24 +139,45 @@ int main()
 	 */
 
 	/* Delete the ME/Platform regions, place Gbe after the descriptor, resize BIOS region to fill the gap */
-	descriptorStruct = deblobbedDescriptorStructFromFactory(descriptorStruct, romSize);
+	descriptorStruct = librebootDescriptorStructFromFactory(descriptorStruct, romSize);
+
+	/* The ME is disallowed read-write access to all regions
+	 * (this is probably redundant, since the ME firmware is already removed from libreboot) */
+	descriptorStruct = descriptorMeRegionsForbidden(descriptorStruct);
+	/* Host/CPU is allowed to read/write all regions.
+	 * This makes flashrom -p internal work */
+	descriptorStruct = descriptorHostRegionsUnlocked(descriptorStruct);
+
+	/* Set OEM string */
+	descriptorStruct = descriptorOemString(descriptorStruct);
 
 	/* Modify the Gbe region (see function for details) */
-	gbeStruct8k = deblobbedGbeStructFromFactory(gbeStruct8k);
+	if (descriptorDefinesGbeRegion(descriptorStruct))
+		gbeStruct8k = deblobbedGbeStructFromFactory(gbeStruct8k);
 
 	/* Debugging (after modifying the descriptor and gbe regions) */
 	printDescriptorRegionLocations(descriptorStruct, "Modified");
-	printGbeChecksumDataFromStruct8k(gbeStruct8k, "Modified");
+	if (descriptorDefinesGbeRegion(descriptorStruct))
+		printGbeChecksumDataFromStruct8k(gbeStruct8k, "Modified");
+	else printf("NO GBE REGION\n");
 
 	/*
 	 * ------------------------------------------------------------------
 	 * Create the file with the modified descriptor and gbe inside
 	 * ------------------------------------------------------------------
 	 */
-
 	printf("\n");
-	if (notCreatedDescriptorGbeFile(descriptorStruct, gbeStruct8k, descriptorGbeFilename)) {
-		return 1;
+	if (descriptorDefinesGbeRegion(descriptorStruct))
+	{
+		if (notCreatedDescriptorGbeFile(descriptorStruct, gbeStruct8k, descriptorGbeFilename)) {
+			return 1;
+		}
+	}
+	else
+	{
+		if (notCreated4kDescriptorFile(descriptorStruct, descriptorNoGbeFilename)) {
+			return 1;
+		}
 	}
 	
 	/*
@@ -166,18 +193,29 @@ int main()
 	if (notCreatedCFileFromDescriptorStruct(descriptorStruct, "mkdescriptor.c", "mkdescriptor.h")) {
 		return 1;
 	}
-	
-	/* Code for generating the Gbe struct */
-	/* mkgbe.h */
-	if (notCreatedHFileForGbeCFile("mkgbe.h", "mkgbe.c")) {
-		return 1;
-	} /* and now mkgbe.c */
-	if (notCreatedCFileFromGbeStruct4k(gbeStruct8k.backup, "mkgbe.c", "mkgbe.h")) {
-		return 1;
+
+	if (descriptorDefinesGbeRegion(descriptorStruct))
+	{
+		/* Code for generating the Gbe struct */
+		/* mkgbe.h */
+		if (notCreatedHFileForGbeCFile("mkgbe.h", "mkgbe.c")) {
+			return 1;
+		} /* and now mkgbe.c */
+		if (notCreatedCFileFromGbeStruct4k(gbeStruct8k.backup, "mkgbe.c", "mkgbe.h")) {
+			return 1;
+		}
 	}
 	
-	printf("The modified descriptor and gbe regions have also been dumped as src files: mkdescriptor.c, mkdescriptor.h, mkgbe.c, mkgbe.h\n");
-	printf("To use these in ich9gen, place them in src/ich9gen/ and re-build ich9gen.\n\n");
+	if (descriptorDefinesGbeRegion(descriptorStruct))
+	{
+		printf("The modified descriptor and gbe regions have also been dumped as src files: mkdescriptor.c, mkdescriptor.h, mkgbe.c, mkgbe.h\n");
+		printf("To use these in ich9gen, place them in src/ich9gen/ and re-build ich9gen.\n\n");
+	}
+	else
+	{
+		printf("The modified descriptor region have also been dumped as src files: mkdescriptor.c, mkdescriptor.h\n");
+		printf("To use these in ich9gen, place them in src/ich9gen/ and re-build ich9gen.\n\n");
+	}
 
 	return 0;
 }
diff --git a/resources/utilities/ich9deblob/src/ich9gen.c b/resources/utilities/ich9deblob/src/ich9gen.c
index d07c5500..df5da794 100644
--- a/resources/utilities/ich9deblob/src/ich9gen.c
+++ b/resources/utilities/ich9deblob/src/ich9gen.c
@@ -1,5 +1,5 @@
 /*
- *  Copyright (C) 2014 Francis Rowe <info@gluglug.org.uk>
+ *  Copyright (C) 2014, 2015 Francis Rowe <info@gluglug.org.uk>
  *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -25,8 +25,10 @@ int main(int argc, char *argv[])
 	int i, j;
 	
 	struct GBEREGIONRECORD_8K gbeStruct8k = generatedGbeStruct8k();
-	struct DESCRIPTORREGIONRECORD descriptorStruct4M = generatedDescriptorStructRom4M();
-	struct DESCRIPTORREGIONRECORD descriptorStruct8M = generatedDescriptorStructRom8M();
+	struct DESCRIPTORREGIONRECORD descriptorStruct4M = generatedDescriptorStruct(ROMSIZE_4MB, WITHGBE);
+	struct DESCRIPTORREGIONRECORD descriptorStruct8M = generatedDescriptorStruct(ROMSIZE_8MB, WITHGBE);
+	struct DESCRIPTORREGIONRECORD descriptorStructNoGbe4M = generatedDescriptorStruct(ROMSIZE_4MB, WITHOUTGBE);
+	struct DESCRIPTORREGIONRECORD descriptorStructNoGbe8M = generatedDescriptorStruct(ROMSIZE_8MB, WITHOUTGBE);
 	
 	/* Only for the compatibility checks */
 	struct DESCRIPTORREGIONRECORD dummyDescriptorStruct;
@@ -120,5 +122,20 @@ int main(int argc, char *argv[])
 		return 1;
 	}
 	
+	/*
+	 * ------------------------------------------------------------------
+	 * Generate the 4KiB files (descriptors without GbE), ready to be used in a libreboot image
+	 * In these descriptors, the onboard Intel GbE NIC is disabled; a discrete one is used instead
+	 * ------------------------------------------------------------------
+	 */
+	
+	if (notCreated4kDescriptorFile(descriptorStructNoGbe4M, "ich9fdnogbe_4m.bin")) {
+		return 1;
+	}
+	
+	if (notCreated4kDescriptorFile(descriptorStructNoGbe8M, "ich9fdnogbe_8m.bin")) {
+		return 1;
+	}
+	
 	return 0;
 }
diff --git a/resources/utilities/ich9deblob/src/ich9gen.h b/resources/utilities/ich9deblob/src/ich9gen.h
index 25cf3405..38b6ce48 100644
--- a/resources/utilities/ich9deblob/src/ich9gen.h
+++ b/resources/utilities/ich9deblob/src/ich9gen.h
@@ -31,6 +31,9 @@
 #include "descriptor/descriptor.h"   /* structs describing what's in the descriptor region */
 #include "gbe/gbe.h"                 /* structs describing what's in the gbe region */
 
+#define WITHGBE 1
+#define WITHOUTGBE 0
+
 int main(int argc, char *argv[]);
 
 #endif
diff --git a/resources/utilities/ich9deblob/src/ich9gen/mkdescriptor.c b/resources/utilities/ich9deblob/src/ich9gen/mkdescriptor.c
index cc7e0222..3503d54e 100644
--- a/resources/utilities/ich9deblob/src/ich9gen/mkdescriptor.c
+++ b/resources/utilities/ich9deblob/src/ich9gen/mkdescriptor.c
@@ -1,5 +1,5 @@
 /*
- *  Copyright (C) 2014 Francis Rowe <info@gluglug.org.uk>
+ *  Copyright (C) 2014, 2015 Francis Rowe <info@gluglug.org.uk>
  *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -20,7 +20,7 @@
 /* Generate a 4KiB Descriptor struct, with default values. */
 /* Read ../descriptor/descriptor.h for an explanation of the default values used here */
 
-struct DESCRIPTORREGIONRECORD generatedDescriptorStruct(unsigned int romSize)
+struct DESCRIPTORREGIONRECORD generatedDescriptorStruct(unsigned int romSize, int hasGbe)
 {
     int i;
     struct DESCRIPTORREGIONRECORD descriptorStruct;
@@ -34,7 +34,7 @@ struct DESCRIPTORREGIONRECORD generatedDescriptorStruct(unsigned int romSize)
     descriptorStruct.flMaps.flMap0.NC = 0x0;
     descriptorStruct.flMaps.flMap0.reserved1 = 0x00;
     descriptorStruct.flMaps.flMap0.FRBA = 0x04;
-    descriptorStruct.flMaps.flMap0.NR = 0x2; /* see ../descriptor/descriptor.c */
+    descriptorStruct.flMaps.flMap0.NR = hasGbe ? 0x2 : 0x1; /* see ../descriptor/descriptor.c */
     descriptorStruct.flMaps.flMap0.reserved2 = 0x00;
     /* FLMAP1 */
     descriptorStruct.flMaps.flMap1.FMBA = 0x06;
@@ -49,8 +49,8 @@ struct DESCRIPTORREGIONRECORD generatedDescriptorStruct(unsigned int romSize)
 
     /* Component Section Record */
     /* FLCOMP */
-    descriptorStruct.componentSection.flcomp.component1Density = 0x4;
-    descriptorStruct.componentSection.flcomp.component2Density = 0x2;
+    descriptorStruct.componentSection.flcomp.component1Density = componentDensity(romSize);
+    descriptorStruct.componentSection.flcomp.component2Density = componentDensity(romSize);
     descriptorStruct.componentSection.flcomp.reserved1 = 0x0;
     descriptorStruct.componentSection.flcomp.reserved2 = 0x00;
     descriptorStruct.componentSection.flcomp.reserved3 = 0x0;
@@ -76,10 +76,8 @@ struct DESCRIPTORREGIONRECORD generatedDescriptorStruct(unsigned int romSize)
     descriptorStruct.regionSection.flReg0.LIMIT = 0x0000;
     descriptorStruct.regionSection.flReg0.reserved2 = 0x0;
     /* FLREG1 (BIOS) */
-    /* descriptorStruct.regionSection.flReg1.BASE = 0x0003; */
-    descriptorStruct.regionSection.flReg1.BASE = (DESCRIPTORREGIONSIZE + GBEREGIONSIZE_8K) >> FLREGIONBITSHIFT; /* see ../descriptor/descriptor.c */
+    descriptorStruct.regionSection.flReg1.BASE = (DESCRIPTORREGIONSIZE + (hasGbe ? GBEREGIONSIZE_8K : 0)) >> FLREGIONBITSHIFT; /* see ../descriptor/descriptor.c */
     descriptorStruct.regionSection.flReg1.reserved1 = 0x0;
-    /* descriptorStruct.regionSection.flReg1.LIMIT = 0x07ff; */
     descriptorStruct.regionSection.flReg1.LIMIT = ((romSize >> FLREGIONBITSHIFT) - 1); /* see ../descriptor/descriptor.c */
     descriptorStruct.regionSection.flReg1.reserved2 = 0x0;
     /* FLREG2 (ME) */
@@ -88,11 +86,9 @@ struct DESCRIPTORREGIONRECORD generatedDescriptorStruct(unsigned int romSize)
     descriptorStruct.regionSection.flReg2.LIMIT = 0x0000; /* see ../descriptor/descriptor.c */
     descriptorStruct.regionSection.flReg2.reserved2 = 0x0;
     /* FLREG3 (Gbe) */
-    /* descriptorStruct.regionSection.flReg3.BASE = 0x0001; */
-    descriptorStruct.regionSection.flReg3.BASE = DESCRIPTORREGIONSIZE >> FLREGIONBITSHIFT; /* see ../descriptor/descriptor.c */
+    descriptorStruct.regionSection.flReg3.BASE = hasGbe ? (DESCRIPTORREGIONSIZE >> FLREGIONBITSHIFT) : 0x1fff; /* see ../descriptor/descriptor.c */
     descriptorStruct.regionSection.flReg3.reserved1 = 0x0;
-    /* descriptorStruct.regionSection.flReg3.LIMIT = 0x0002; */
-    descriptorStruct.regionSection.flReg3.LIMIT = GBEREGIONSIZE_8K >> FLREGIONBITSHIFT; /* see ../descriptor/descriptor.c */
+    descriptorStruct.regionSection.flReg3.LIMIT = hasGbe ? (GBEREGIONSIZE_8K >> FLREGIONBITSHIFT) : 0x0000; /* see ../descriptor/descriptor.c */
     descriptorStruct.regionSection.flReg3.reserved2 = 0x0;
     /* FLREG4 (Platform) */
     descriptorStruct.regionSection.flReg4.BASE = 0x1fff; /* see ../descriptor/descriptor.c */
@@ -161,8 +157,8 @@ struct DESCRIPTORREGIONRECORD generatedDescriptorStruct(unsigned int romSize)
     descriptorStruct.ichStraps.ichStrap0.bmcMode = 0x0;
     descriptorStruct.ichStraps.ichStrap0.tripPointSelect = 0x0;
     descriptorStruct.ichStraps.ichStrap0.reserved2 = 0x0;
-    descriptorStruct.ichStraps.ichStrap0.integratedGbe = 0x1;
-    descriptorStruct.ichStraps.ichStrap0.lanPhy = 0x1;
+    descriptorStruct.ichStraps.ichStrap0.integratedGbe = hasGbe ? 0x1 : 0x0;
+    descriptorStruct.ichStraps.ichStrap0.lanPhy = hasGbe ? 0x1 : 0x0;
     descriptorStruct.ichStraps.ichStrap0.reserved3 = 0x0;
     descriptorStruct.ichStraps.ichStrap0.dmiRequesterId = 0x0;
     descriptorStruct.ichStraps.ichStrap0.smBus2Address = 0x00;
@@ -231,13 +227,3 @@ struct DESCRIPTORREGIONRECORD generatedDescriptorStruct(unsigned int romSize)
     return descriptorStruct;
 }
 
-struct DESCRIPTORREGIONRECORD generatedDescriptorStructRom4M()
-{
-    return generatedDescriptorStruct(ROMSIZE_4MB);
-}
-
-struct DESCRIPTORREGIONRECORD generatedDescriptorStructRom8M()
-{
-    return generatedDescriptorStruct(ROMSIZE_8MB);
-}
-
diff --git a/resources/utilities/ich9deblob/src/ich9gen/mkdescriptor.h b/resources/utilities/ich9deblob/src/ich9gen/mkdescriptor.h
index 745f11f9..3167a9de 100644
--- a/resources/utilities/ich9deblob/src/ich9gen/mkdescriptor.h
+++ b/resources/utilities/ich9deblob/src/ich9gen/mkdescriptor.h
@@ -23,11 +23,5 @@
 #include <stdint.h>
 #include "../descriptor/descriptor.h"
 
-/* ROM image sizes in bytes */
-#define ROMSIZE_4MB 0x400000
-#define ROMSIZE_8MB 0x800000
-
-struct DESCRIPTORREGIONRECORD generatedDescriptorStruct(unsigned int romSize);
-struct DESCRIPTORREGIONRECORD generatedDescriptorStructRom4M();
-struct DESCRIPTORREGIONRECORD generatedDescriptorStructRom8M();
+struct DESCRIPTORREGIONRECORD generatedDescriptorStruct(unsigned int romSize, int hasGbe);
 #endif