diff options
| author | Arthur Heymans <arthur@aheymans.xyz> | 2017-02-27 16:27:21 +0100 |
|---|---|---|
| committer | Nico Huber <nico.h@gmx.de> | 2017-05-08 14:40:04 +0200 |
| commit | ddc88286979ebce24320f1fc44ba881ea8fdf114 (patch) | |
| tree | 9361ff4dd8217ae3523510cf1b77346725356a61 /src/northbridge | |
| parent | 0edf5dc331d427758fc6c72f176e019ede06fb92 (diff) | |
| download | coreboot-ddc88286979ebce24320f1fc44ba881ea8fdf114.tar.xz | |
nb/x4x/raminit.c: Remove ME locking code
This code ought not to run if ME is disabled. It also prohibits
writing to some GMCH regs like GGC bit1.
Intel ® 4 Series Chipset Family datasheet refers to this as
"ME stolen Memory lock" without actually describing this
functionality.
Change-Id: Iaa8646e535e13c44c010ccd434a5af954cf7dfbc
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/18513
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Diffstat (limited to 'src/northbridge')
| -rw-r--r-- | src/northbridge/intel/x4x/raminit_ddr2.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/src/northbridge/intel/x4x/raminit_ddr2.c b/src/northbridge/intel/x4x/raminit_ddr2.c index eca7189145..35caaa6b73 100644 --- a/src/northbridge/intel/x4x/raminit_ddr2.c +++ b/src/northbridge/intel/x4x/raminit_ddr2.c @@ -2106,15 +2106,19 @@ void raminit_ddr2(struct sysinfo *s) printk(BIOS_DEBUG, "Done power settings\n"); // ME related - if (RANK_IS_POPULATED(s->dimms, 0, 0) - || RANK_IS_POPULATED(s->dimms, 1, 0)) { - MCHBAR8(0xa2f) = MCHBAR8(0xa2f) | (1 << 0); + /* + * FIXME: This locks some registers like bit1 of GGC + * and is only needed in case of ME being used. + */ + if (ME_UMA_SIZEMB != 0) { + if (RANK_IS_POPULATED(s->dimms, 0, 0) + || RANK_IS_POPULATED(s->dimms, 1, 0)) + MCHBAR8(0xa2f) = MCHBAR8(0xa2f) | (1 << 0); + if (RANK_IS_POPULATED(s->dimms, 0, 1) + || RANK_IS_POPULATED(s->dimms, 1, 1)) + MCHBAR8(0xa2f) = MCHBAR8(0xa2f) | (1 << 1); + MCHBAR32(0xa30) = MCHBAR32(0xa30) | (1 << 26); } - if (RANK_IS_POPULATED(s->dimms, 0, 1) - || RANK_IS_POPULATED(s->dimms, 1, 1)) { - MCHBAR8(0xa2f) = MCHBAR8(0xa2f) | (1 << 1); - } - MCHBAR32(0xa30) = MCHBAR32(0xa30) | (1 << 26); printk(BIOS_DEBUG, "Done ddr2\n"); } |