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| author | Timothy Pearson <tpearson@raptorengineering.com> | 2017-01-09 12:13:52 -0600 |
|---|---|---|
| committer | Timothy Pearson <tpearson@raptorengineering.com> | 2017-01-10 19:17:28 +0100 |
| commit | 21b01b80d6a11a24d69a3e7ccd7c113681b6dcee (patch) | |
| tree | a2156c617ed774a18eacea3ee6c7d15ca3392c7c /src | |
| parent | ccc042b8216752dd6c8181ec94003921b86d9a25 (diff) | |
| download | coreboot-21b01b80d6a11a24d69a3e7ccd7c113681b6dcee.tar.xz | |
amd/mct/ddr3: Fix incorrect DQ mask calculation
On AMD DDR3 platforms, the upper DQMask was incorrectly
calculated, leading to undefined behaviour and possible
DRAM training faults. Use the correct calculation for
the upper DQMask.
Found-by: Coverity Scan #1347394 #1347393
Change-Id: If3190eb7c30f1f00d6fd8b751bc1761c9d119782
Signed-off-by: Timothy Pearson <tpearson@raptorengineering.com>
Reviewed-on: https://review.coreboot.org/18068
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Diffstat (limited to 'src')
| -rw-r--r-- | src/northbridge/amd/amdmct/mct_ddr3/mctdqs_d.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/northbridge/amd/amdmct/mct_ddr3/mctdqs_d.c b/src/northbridge/amd/amdmct/mct_ddr3/mctdqs_d.c index bd82a014c6..9783f38993 100644 --- a/src/northbridge/amd/amdmct/mct_ddr3/mctdqs_d.c +++ b/src/northbridge/amd/amdmct/mct_ddr3/mctdqs_d.c @@ -1073,7 +1073,7 @@ void read_dram_dqs_training_pattern_fam15(struct MCTStatStruc *pMCTstat, Set_NB32_DCT(dev, dct, 0x27c, dword); } else if (lane < 8) { Set_NB32_DCT(dev, dct, 0x274, ~0x0); - Set_NB32_DCT(dev, dct, 0x278, ~(0xff << (lane * 8))); + Set_NB32_DCT(dev, dct, 0x278, ~(0xff << ((lane - 4) * 8))); dword = Get_NB32_DCT(dev, dct, 0x27c); dword |= 0xff; /* EccMask = 0xff */ Set_NB32_DCT(dev, dct, 0x27c, dword); @@ -1170,7 +1170,7 @@ void write_dram_dqs_training_pattern_fam15(struct MCTStatStruc *pMCTstat, Set_NB32_DCT(dev, dct, 0x27c, dword); } else if (lane < 8) { Set_NB32_DCT(dev, dct, 0x274, ~0x0); - Set_NB32_DCT(dev, dct, 0x278, ~(0xff << (lane * 8))); + Set_NB32_DCT(dev, dct, 0x278, ~(0xff << ((lane - 4) * 8))); dword = Get_NB32_DCT(dev, dct, 0x27c); dword |= 0xff; /* EccMask = 0xff */ Set_NB32_DCT(dev, dct, 0x27c, dword); |