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device: Make a note that SeaBIOS doesn't support above 4G MMIO

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This is fairly intuitive upon thinking about it, SeaBIOS has neither
long mode nor PAE page tables, but make it obvious to developers,
and let users know this.

Change-Id: I769c1bdb9d7ea78d56455d125adf3d9bf07a1211
Signed-off-by: Benjamin Doron <benjamin.doron@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/88453
Reviewed-by: Maximilian Brune <maximilian.brune@9elements.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Benjamin Doron 2025-07-16 14:11:59 -04:00 • committed by Matt DeVillier
commit c5613469ae
1 changed files with 1 additions and 1 deletions
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src/device/Kconfig
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@ -1015,7 +1015,7 @@ config ALWAYS_ALLOW_ABOVE_4G_ALLOCATION
Required for modern graphics cards that support resizable BAR, such as
Intel Arc or AMD RX series.
Please keep in mind that not all payloads support it
(i.e: LinuxBoot and EDK2 do, GRUB doesn't).
(i.e: LinuxBoot and EDK2 do, SeaBIOS and GRUB don't).
config XHCI_UTILS
def_bool n