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| author | Timothy Pearson <tpearson@raptorengineeringinc.com> | 2015-09-05 17:55:58 -0500 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2015-10-26 23:52:54 +0100 |
| commit | b8a355dcdf319671b97f8688209ad5d471fc0905 (patch) | |
| tree | 6cd55b06343af460642431bb8dd3d782d0ccc45e /src/northbridge/amd/amdmct/mct_ddr3/mctsdi.c | |
| parent | 7a5413a81c2fecc443999b006d641cd903327346 (diff) | |
| download | coreboot-b8a355dcdf319671b97f8688209ad5d471fc0905.tar.gz coreboot-b8a355dcdf319671b97f8688209ad5d471fc0905.tar.bz2 coreboot-b8a355dcdf319671b97f8688209ad5d471fc0905.zip | |
northbridge/amd/amdmct: Fix broken AMD K10 DDR3 memory initalization
The native AMD DDR3 memory initialization code was riddled with
numerous errors and was missing critical configuration code segments;
this made it so that DDR3 memory did not function on most AMD boards.
This patch corrects enough of the DDR3 initialization such that
UDIMMs can be used on most channels of G34 Opteron boards. Further
work is needed to fix the broken RDIMM code and remaining UDIMM issues.
Change-Id: Iab690db769e820600693ad1170085623b177b94e
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/11941
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Diffstat (limited to 'src/northbridge/amd/amdmct/mct_ddr3/mctsdi.c')
| -rw-r--r-- | src/northbridge/amd/amdmct/mct_ddr3/mctsdi.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/northbridge/amd/amdmct/mct_ddr3/mctsdi.c b/src/northbridge/amd/amdmct/mct_ddr3/mctsdi.c index 6de2f4eee117..b21b96a641fb 100644 --- a/src/northbridge/amd/amdmct/mct_ddr3/mctsdi.c +++ b/src/northbridge/amd/amdmct/mct_ddr3/mctsdi.c @@ -2,6 +2,7 @@ * This file is part of the coreboot project. * * Copyright (C) 2010 Advanced Micro Devices, Inc. + * Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering * * 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 @@ -172,6 +173,7 @@ static u32 mct_MR1(struct MCTStatStruc *pMCTstat, ret |= 1 << 11; } + /* program MrsAddress[12]=QOFF: based on F2x[1,0]84[Qoff] */ if (dword & (1 << 13)) ret |= 1 << 12; @@ -199,7 +201,8 @@ static u32 mct_MR0(struct MCTStatStruc *pMCTstat, /* program MrsAddress[6:4,2]=read CAS latency (CL):based on F2x[1,0]88[Tcl] */ dword2 = Get_NB32(dev, reg_off + 0x88); - ret |= (dword2 & 0xF) << 4; /* F2x88[3:0] to MrsAddress[6:4,2]=xxx0b */ + ret |= (dword2 & 0x7) << 4; /* F2x88[2:0] to MrsAddress[6:4] */ + ret |= ((dword2 & 0x8) >> 3) << 2; /* F2x88[3] to MrsAddress[2] */ /* program MrsAddress[12]=0 (PPD):slow exit */ if (dword & (1 << 23)) |