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x86: Don't set up MTRRs if previously done

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When starting U-Boot from a previous-stage bootloader we presumably don't
need to set up the variable MTRRs. In fact this could be harmful if the
existing settings are not what U-Boot uses.

Skip that step in this case.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
2021-06-27 17:51:01 -06:00
committed by Bin Meng
parent bca2d579f4
commit 92873f83d1
1 changed files with 1 additions and 1 deletions
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2
arch/x86/cpu/i386/cpu.c
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@@ -423,7 +423,7 @@ static void setup_mtrr(void)
u64 mtrr_cap; u64 mtrr_cap;
/* Configure fixed range MTRRs for some legacy regions */ /* Configure fixed range MTRRs for some legacy regions */
if (!gd->arch.has_mtrr) if (!gd->arch.has_mtrr || !ll_boot_init())
return; return;
mtrr_cap = native_read_msr(MTRR_CAP_MSR); mtrr_cap = native_read_msr(MTRR_CAP_MSR);