Attention is currently required from: Damien Zammit, Patrick Rudolph. Angel Pons has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/49398 )
Change subject: nb/intel/x4x: Unroll programming RCOMP data group ......................................................................
nb/intel/x4x: Unroll programming RCOMP data group
The RCOMP data group is special and is programmed differently. Prepare to simplify the code by programming it outside of the loop. Subsequent commits will simplify the logic even further, then clean up cosmetics.
The special DDR3 case in the loop overwrites the command group strength multiplier value. It doesn't need to be programmed for each RCOMP group. Add a comment to justify not programming this register while programming the settings for the RCOMP data group.
Tested on Asus P5QL PRO (DDR2), still boots.
Change-Id: I5c2484f48e3c07e8e787b1894932e342e8e8a75c Signed-off-by: Angel Pons th3fanbus@gmail.com --- M src/northbridge/intel/x4x/raminit_ddr23.c 1 file changed, 19 insertions(+), 12 deletions(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/98/49398/1
diff --git a/src/northbridge/intel/x4x/raminit_ddr23.c b/src/northbridge/intel/x4x/raminit_ddr23.c index d0d999b..0f3cbb1 100644 --- a/src/northbridge/intel/x4x/raminit_ddr23.c +++ b/src/northbridge/intel/x4x/raminit_ddr23.c @@ -1093,20 +1093,25 @@ }
FOR_EACH_POPULATED_CHANNEL(s->dimms, i) { + /* RCOMP data group is special, program it separately */ + MCHBAR32_AND_OR(0x400*i + 0x31c, ~0xff000, + 0xaa000); + MCHBAR16_AND_OR(0x400*i + 0x320, ~0xffff, + 0x6666); + for (k = 0; k < 8; k++) { + MCHBAR32_AND_OR(0x400*i + 0x31c + + 0xe + (k << 2), + ~0x3f3f3f3f, x32a[k]); + MCHBAR32_AND_OR(0x400*i + 0x31c + + 0x2e + (k << 2), + ~0x3f3f3f3f, x32a[k]); + } + MCHBAR8_AND_OR(0x400*i + 0x31c, ~1, 0); + + /* Now program the other RCOMP groups */ for (j = 0; j < 6; j++) { if (j == 0) { - MCHBAR32_AND_OR(0x400*i + addr[j], ~0xff000, - 0xaa000); - MCHBAR16_AND_OR(0x400*i + 0x320, ~0xffff, - 0x6666); - for (k = 0; k < 8; k++) { - MCHBAR32_AND_OR(0x400*i + addr[j] + - 0xe + (k << 2), - ~0x3f3f3f3f, x32a[k]); - MCHBAR32_AND_OR(0x400*i + addr[j] + - 0x2e + (k << 2), - ~0x3f3f3f3f, x32a[k]); - } + continue; } else { MCHBAR16_AND_OR(0x400*i + addr[j], ~0xf000, 0xa000); @@ -1129,6 +1134,8 @@ MCHBAR32_AND_OR(0x400*i + addr[j] + 0x2a, ~0x3f3f3f3f, x39e[j]); } + + /* Override command group strength multiplier */ if (s->spd_type == DDR3 && BOTH_DIMMS_ARE_POPULATED(s->dimms, i)) { MCHBAR16_AND_OR(0x378 + 0x400 * i,