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x86/coreboot: Exclude memory regions starting above 4GB

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This commit updates the RAM region filtering logic in
board_get_usable_ram_top() to skip any memory regions whose start address
is above 4GB. Previously, only the end address was capped at 4GB, but
regions entirely above this threshold were still considered.

Typically, the following memory map entries would cause
board_get_usable_ram_top() to return 0x100000000, which is incorrect.

    start=00000000, end=00001000, type=16
    start=00001000, end=000a0000, type=1
    start=000a0000, end=000f6000, type=2
    start=000f6000, end=000f7000, type=16
    start=000f7000, end=00100000, type=2
    start=00100000, end=6f170000, type=1
    start=6f170000, end=70000000, type=16
    start=70000000, end=80800000, type=2
    start=e0000000, end=f8000000, type=2
    start=fa000000, end=fc000000, type=2
    start=fc800000, end=fc880000, type=2
    start=fd800000, end=fe800000, type=2
    start=feb00000, end=feb80000, type=2
    start=fec00000, end=fed00000, type=2
    start=fed20000, end=fed80000, type=2
    start=feda1000, end=feda2000, type=2
    start=fedc0000, end=fede0000, type=2
    start=100000000, end=102400000, type=2
    start=102400000, end=47f800000, type=1
    start=4000000000, end=4020000000, type=2

By adding a check to continue the loop if the region's start address
exceeds 0xffffffffULL, the function now properly ignores regions that are
not usable in 32-bit address space.

Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
This commit is contained in:
Jeremy Compostella 2026-02-03 19:42:36 -07:00 committed by Tom Rini
parent e7ef80f670
commit 8666b16015
1 changed files with 2 additions and 0 deletions
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2
arch/x86/cpu/coreboot/sdram.c
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@ -42,6 +42,8 @@ phys_addr_t board_get_usable_ram_top(phys_size_t total_size)
continue;
/* Filter memory over 4GB. */
if (start > 0xffffffffULL)
continue;
if (end > 0xffffffffULL)
end = 0x100000000ULL;
/* Skip this region if it's too small. */