tree 18e2b4ddf26c163ac9e3cf6d08a6abfd001506b7
parent 53b1929e83b56ecc97989b5656896f1886434672
author Bin Meng <bmeng@tinylab.org> 1683885346 +0800
committer Felix Singer <service+coreboot-gerrit@felixsinger.de> 1684708419 +0000

drivers/emulation/qemu/bochs: Fix the MMIO access to the VGA ioports

The Bochs graphics adapter remaps the legacy VGA ioports
(0x3c0 -> 0x3df) to its MMIO region at offsets 0400 - 041f.
Currently bochs_vga_write() calculates a wrong offset when
accessing these ioports, which causes the boot splash image
not displayed when using the legacy-free pci variant of the
Bochs graphics adapter.

TEST=Build coreboot for QEMU x86 i440fx with a boot splash image
included, boot coreboot.rom with QEMU with '-device secondary-vga'
and verify the boot splash image is correctly displayed.

Fixes: efaf1b32ba1e ("drivers/emulation/qemu/bochs: Rewrite driver")
Signed-off-by: Bin Meng <bmeng@tinylab.org>
Change-Id: I4acc71e3d6ef5161ab62e6714c94b7643c4c0972
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75146
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>