diff options
Diffstat (limited to 'resources/libreboot/patch/misc/0006-northbridge-gm45-raminit.c-enable-GS45-high-performa.patch')
| -rw-r--r-- | resources/libreboot/patch/misc/0006-northbridge-gm45-raminit.c-enable-GS45-high-performa.patch | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/resources/libreboot/patch/misc/0006-northbridge-gm45-raminit.c-enable-GS45-high-performa.patch b/resources/libreboot/patch/misc/0006-northbridge-gm45-raminit.c-enable-GS45-high-performa.patch new file mode 100644 index 00000000..33b7978a --- /dev/null +++ b/resources/libreboot/patch/misc/0006-northbridge-gm45-raminit.c-enable-GS45-high-performa.patch @@ -0,0 +1,52 @@ +From 115b09a63d1e5eb07d8c12a6c5369c1577b41f42 Mon Sep 17 00:00:00 2001 +From: Steve Shenton <sgsit@libreboot.org> +Date: Fri, 7 Aug 2015 08:22:27 +0100 +Subject: [PATCH 6/9] northbridge/gm45/raminit.c: enable GS45 high-performance + mode + +The datasheets for GS45 describe a high- and low-performance mode +for different CPUs. Coreboot currently disables GS45 altogether, +but forcing coreboot to treat high-performance GS45 as GM45 makes +the X200S and X200 Tablet boot if it has the right CPU type. + +Hardcode-enable GS45 high-performance mode in coreboot, passing it +off as GM45. This is known to work with all CPUs except the SU +(low performance) models. + +The low-performance models are unsupported anyway, requiring +extensive work on the raminit. For now, this patch increases +compatibility to a whole new chipset (GS45), depending on the CPU. + +Change-Id: I2719385e93c37d254ce38e0f5f486262160234e1 +Signed-off-by: Steve Shenton <sgsit@libreboot.org> +Signed-off-by: Francis Rowe <info@gluglug.org.uk> +--- + src/northbridge/intel/gm45/raminit.c | 5 ++--- + 1 file changed, 2 insertions(+), 3 deletions(-) + +diff --git a/src/northbridge/intel/gm45/raminit.c b/src/northbridge/intel/gm45/raminit.c +index 9c4fecd..1614b7c 100644 +--- a/src/northbridge/intel/gm45/raminit.c ++++ b/src/northbridge/intel/gm45/raminit.c +@@ -108,8 +108,7 @@ void get_gmch_info(sysinfo_t *sysinfo) + printk(BIOS_SPEW, "GMCH: GS40\n"); + break; + case GMCH_GS45: +- printk(BIOS_SPEW, "GMCH: GS45, using low power mode by default\n"); +- sysinfo->gs45_low_power_mode = 1; ++ printk(BIOS_SPEW, "GMCH: GS45, using high performance mode by default\n"); + break; + case GMCH_PM45: + printk(BIOS_SPEW, "GMCH: PM45\n"); +@@ -1692,7 +1691,7 @@ void raminit(sysinfo_t *const sysinfo, const int s3resume) + { + const dimminfo_t *const dimms = sysinfo->dimms; + const timings_t *const timings = &sysinfo->selected_timings; +- const int sff = sysinfo->gfx_type == GMCH_GS45; ++ const int sff = (sysinfo->gfx_type == GMCH_GS45) && (sysinfo->gs45_low_power_mode == 1); + + int ch; + u8 reg8; +-- +1.9.1 + |