diff options
Diffstat (limited to 'resources/libreboot/patch/kgpe-d16/0043-amd-amdmct-mct_ddr3-Improve-SPD-DIMM-detect-reliabil.patch')
| -rw-r--r-- | resources/libreboot/patch/kgpe-d16/0043-amd-amdmct-mct_ddr3-Improve-SPD-DIMM-detect-reliabil.patch | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/resources/libreboot/patch/kgpe-d16/0043-amd-amdmct-mct_ddr3-Improve-SPD-DIMM-detect-reliabil.patch b/resources/libreboot/patch/kgpe-d16/0043-amd-amdmct-mct_ddr3-Improve-SPD-DIMM-detect-reliabil.patch new file mode 100644 index 00000000..8445869f --- /dev/null +++ b/resources/libreboot/patch/kgpe-d16/0043-amd-amdmct-mct_ddr3-Improve-SPD-DIMM-detect-reliabil.patch @@ -0,0 +1,49 @@ +From 3333f1b6ab84234f51aa901ec29cdc6d7f0998c5 Mon Sep 17 00:00:00 2001 +From: Timothy Pearson <tpearson@raptorengineeringinc.com> +Date: Thu, 4 Jun 2015 00:10:03 -0500 +Subject: [PATCH 043/143] amd/amdmct/mct_ddr3: Improve SPD DIMM detect + reliability + +Change-Id: Ifab63eca2233c63a6a42ab8b7e742f8e47fb2a09 +Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com> +--- + src/northbridge/amd/amdmct/mct_ddr3/mct_d.c | 13 ++++++++++++- + 1 file changed, 12 insertions(+), 1 deletion(-) + +diff --git a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c +index 5344ff9..e60adb7 100644 +--- a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c ++++ b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c +@@ -3657,6 +3657,7 @@ static u8 DIMMPresence_D(struct MCTStatStruc *pMCTstat, + u8 devwidth; + u16 DimmSlots; + u8 byte = 0, bytex; ++ uint8_t crc_status; + + /* preload data structure with addrs */ + mctGet_DIMMAddr(pDCTstat, pDCTstat->Node_ID); +@@ -3677,10 +3678,20 @@ static u8 DIMMPresence_D(struct MCTStatStruc *pMCTstat, + int status; + smbaddr = Get_DIMMAddress_D(pDCTstat, i); + status = mctRead_SPD(smbaddr, SPD_ByteUse); ++ if (status >= 0) { ++ /* Verify result */ ++ status = mctRead_SPD(smbaddr, SPD_ByteUse); ++ } + if (status >= 0) { /* SPD access is ok */ + pDCTstat->DIMMPresent |= 1 << i; + read_spd_bytes(pMCTstat, pDCTstat, i); +- if (crcCheck(pDCTstat, i)) { /* CRC is OK */ ++ crc_status = crcCheck(pDCTstat, i); ++ if (!crc_status) { ++ /* Try again in case there was a transient glitch */ ++ read_spd_bytes(pMCTstat, pDCTstat, i); ++ crc_status = crcCheck(pDCTstat, i); ++ } ++ if (crc_status) { /* CRC is OK */ + byte = pDCTstat->spd_data.spd_bytes[i][SPD_TYPE]; + if (byte == JED_DDR3SDRAM) { + /*Dimm is 'Present'*/ +-- +1.7.9.5 + |