arch/x86: Remove WB attribute from 0..CACHE_TMP_RAMTOP
Platforms using postcar are with RELOCATABLE_RAMSTAGE=y. They don't benefit from having low-memory set as writeback-cacheable. This also fixes regression from CB:34893 that caused some random hangs with more recent intel SoCs in ramstage. BUG=b:140250314 Change-Id: Ia66910a6c85286f5c05823b87d48edc7e4ad9541 Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/35161 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Furquan Shaikh <furquan@google.com> Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
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@ -125,9 +125,6 @@ void postcar_frame_common_mtrrs(struct postcar_frame *pcf)
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if (pcf->skip_common_mtrr)
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return;
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/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
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postcar_frame_add_mtrr(pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
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/* Cache the ROM as WP just below 4GiB. */
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postcar_frame_add_romcache(pcf, MTRR_TYPE_WRPROT);
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}
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