diff options
| author | Timothy Pearson <tpearson@raptorengineeringinc.com> | 2015-06-11 16:14:15 -0500 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2015-11-12 21:11:47 +0100 |
| commit | f3b9fd32658a9a6788b87431464b84cda3c3c24b (patch) | |
| tree | c9ed16b0b11b97da2ca11cf26a284bb17303a127 /src/northbridge/amd/amdmct | |
| parent | 861f920cdfa1f8a322ecd2a56da8c8a9fdfd1155 (diff) | |
src/northbridge/amd/amdmct: Add option to override bad SPD checksum
Certain DIMMs, for example DIMMs on which the EEPROM has been modified
by the end user, may not contain a valid SPD checksum. While this is
not a normal condition, it may be useful to allow a checksum override
while memory timing parameters are being altered, e.g. in the course
of overclocking or underclocking, or when recovering from a bad SPD
write.
This is an advanced level feature primarily useful for debugging
and development.
Change-Id: Ia743a13348d0a6e5e4dfffa04ed9582e0f7f3dad
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/11987
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Diffstat (limited to 'src/northbridge/amd/amdmct')
| -rw-r--r-- | src/northbridge/amd/amdmct/mct_ddr3/mct_d.c | 5 | ||||
| -rw-r--r-- | src/northbridge/amd/amdmct/wrappers/mcti_d.c | 8 |
2 files changed, 11 insertions, 2 deletions
diff --git a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c index 2841b18c6d..4bfb08aafc 100644 --- a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c +++ b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c @@ -1456,7 +1456,7 @@ restartinit: } } if (NodesWmem == 0) { - printk(BIOS_DEBUG, "No Nodes?!\n"); + printk(BIOS_ALERT, "Unable to detect valid memory on any nodes. Halting!\n"); goto fatalexit; } @@ -3892,13 +3892,14 @@ static u8 DIMMPresence_D(struct MCTStatStruc *pMCTstat, read_spd_bytes(pMCTstat, pDCTstat, i); crc_status = crcCheck(pDCTstat, i); } - if (crc_status) { /* CRC is OK */ + if ((crc_status) || (SPDCtrl == 2)) { /* CRC is OK */ byte = pDCTstat->spd_data.spd_bytes[i][SPD_TYPE]; if (byte == JED_DDR3SDRAM) { /*Dimm is 'Present'*/ pDCTstat->DIMMValid |= 1 << i; } } else { + printk(BIOS_WARNING, "Node %d DIMM %d: SPD checksum invalid\n", pDCTstat->Node_ID, i); pDCTstat->DIMMSPDCSE = 1 << i; if (SPDCtrl == 0) { pDCTstat->ErrStatus |= 1 << SB_DIMMChkSum; diff --git a/src/northbridge/amd/amdmct/wrappers/mcti_d.c b/src/northbridge/amd/amdmct/wrappers/mcti_d.c index 45f817791b..f49e973a68 100644 --- a/src/northbridge/amd/amdmct/wrappers/mcti_d.c +++ b/src/northbridge/amd/amdmct/wrappers/mcti_d.c @@ -146,6 +146,14 @@ static u16 mctGet_NVbits(u8 index) case NV_SPDCHK_RESTRT: val = 0; /* Exit current node initialization if any DIMM has SPD checksum error */ //val = 1; /* Ignore faulty SPD checksum (DIMM will still be disabled), continue current node intialization */ + //val = 2; /* Override faulty SPD checksum (DIMM will be enabled), continue current node intialization */ + + if (get_option(&nvram, "dimm_spd_checksum") == CB_SUCCESS) + val = nvram & 0x3; + + if (val > 2) + val = 2; + break; case NV_DQSTrainCTL: //val = 0; /*Skip dqs training */ |