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nb/intel/sandybridge: Reorder IOSAV writes 

We only write to the IOSAV LFSR registers twice, but we do so between
the writes to the other four IOSAV per-subsequence registers. Since we
know that the IOSAV is sleeping when we program the subsequences, we
might as well do the two oddball LFSR register writes after we have
programmed the always-written-to group of four registers. That way,
subsequent changes can reproducibly replace the four writes with a
single macro.

Tested on Asus P8Z77-V LX2, still boots.

Change-Id: If7bb14a9862a53a3eba565d17401347dcc9ffbe9
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40973
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Angel Pons 2020-05-02 16:51:39 +02:00 committed by Patrick Rudolph
parent 2b6bb79fe4
commit c36cd07f9e
1 changed files with 2 additions and 2 deletions
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4
src/northbridge/intel/sandybridge/raminit_common.c
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@ -2030,16 +2030,16 @@ static int test_320c(ramctr_timing *ctrl, int channel, int slotrank)
MCHBAR32(IOSAV_n_SUBSEQ_CTRL_ch(channel, 1)) =
0x8001020 | ((ctrl->CWL + ctrl->tWTR + 8) << 16);
MCHBAR32(IOSAV_n_SP_CMD_ADDR_ch(channel, 1)) = (slotrank << 24);
MCHBAR32(IOSAV_n_ADDRESS_LFSR_ch(channel, 1)) = 0x389abcd;
MCHBAR32(IOSAV_n_ADDR_UPDATE_ch(channel, 1)) = 0x20e42;
MCHBAR32(IOSAV_n_ADDRESS_LFSR_ch(channel, 1)) = 0x389abcd;
/* DRAM command RD */
MCHBAR32(IOSAV_n_SP_CMD_CTRL_ch(channel, 2)) = IOSAV_RD;
MCHBAR32(IOSAV_n_SUBSEQ_CTRL_ch(channel, 2)) =
0x4001020 | (MAX(ctrl->tRTP, 8) << 16);
MCHBAR32(IOSAV_n_SP_CMD_ADDR_ch(channel, 2)) = (slotrank << 24);
MCHBAR32(IOSAV_n_ADDRESS_LFSR_ch(channel, 2)) = 0x389abcd;
MCHBAR32(IOSAV_n_ADDR_UPDATE_ch(channel, 2)) = 0x20e42;
MCHBAR32(IOSAV_n_ADDRESS_LFSR_ch(channel, 2)) = 0x389abcd;
/* DRAM command PRE */
MCHBAR32(IOSAV_n_SP_CMD_CTRL_ch(channel, 3)) = IOSAV_PRE;