diff options
| author | Angel Pons <th3fanbus@gmail.com> | 2020-07-03 20:31:39 +0200 |
|---|---|---|
| committer | Angel Pons <th3fanbus@gmail.com> | 2020-07-12 10:05:18 +0000 |
| commit | d7bf3ad9397a367021e57d204438a178022aaa8c (patch) | |
| tree | 6adfaa6792bf77ea1369ddccde81d027680b2482 /src/northbridge | |
| parent | ae4fb10240801ba3e55b83ef2c5cdf99b049d3ea (diff) | |
haswell: Compute disabled channel masks at runtime
All mainboards have a non-zero SPD address to implemented DIMM slots.
Knowing this, it is possible to compute the MRC slot population masks
automatically instead of hardcoding the values on each mainboard.
Change-Id: Ia8f369dd1228d53d64471e48700e870e01e77837
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43119
Reviewed-by: Tristan Corrick <tristan@corrick.kiwi>
Reviewed-by: Michael Niewöhner
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/northbridge')
| -rw-r--r-- | src/northbridge/intel/haswell/romstage.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/northbridge/intel/haswell/romstage.c b/src/northbridge/intel/haswell/romstage.c index ee211beab1..7c27827921 100644 --- a/src/northbridge/intel/haswell/romstage.c +++ b/src/northbridge/intel/haswell/romstage.c @@ -23,6 +23,17 @@ void __weak mb_late_romstage_setup(void) { } +/* + * 0 = leave channel enabled + * 1 = disable dimm 0 on channel + * 2 = disable dimm 1 on channel + * 3 = disable dimm 0+1 on channel + */ +static int make_channel_disabled_mask(const struct pei_data *pd, int ch) +{ + return (!pd->spd_addresses[ch + ch] << 0) | (!pd->spd_addresses[ch + ch + 1] << 1); +} + /* The romstage entry point for this platform is not mainboard-specific, hence the name */ void mainboard_romstage_entry(void) { @@ -73,6 +84,10 @@ void mainboard_romstage_entry(void) /* MRC has hardcoded assumptions of 2 meaning S3 wake. Normalize it here. */ pei_data.boot_mode = wake_from_s3 ? 2 : 0; + /* Calculate unimplemented DIMM slots for each channel */ + pei_data.dimm_channel0_disabled = make_channel_disabled_mask(&pei_data, 0); + pei_data.dimm_channel1_disabled = make_channel_disabled_mask(&pei_data, 1); + timestamp_add_now(TS_BEFORE_INITRAM); report_platform_info(); |