diff options
| author | Bin Meng <bmeng@tinylab.org> | 2023-05-12 17:55:46 +0800 |
|---|---|---|
| committer | Felix Singer <service+coreboot-gerrit@felixsinger.de> | 2023-05-21 22:33:39 +0000 |
| commit | 60ee6fa398a110254235b0f9489b153d70a1ae84 (patch) | |
| tree | 18e2b4ddf26c163ac9e3cf6d08a6abfd001506b7 /src/drivers | |
| parent | 53b1929e83b56ecc97989b5656896f1886434672 (diff) | |
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>
Diffstat (limited to 'src/drivers')
| -rw-r--r-- | src/drivers/emulation/qemu/bochs.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/drivers/emulation/qemu/bochs.c b/src/drivers/emulation/qemu/bochs.c index 4634021b67..06504309e0 100644 --- a/src/drivers/emulation/qemu/bochs.c +++ b/src/drivers/emulation/qemu/bochs.c @@ -67,7 +67,7 @@ static void bochs_vga_write(struct resource *res, int index, uint8_t val) if (res->flags & IORESOURCE_IO) outb(val, index + 0x3c0); else - write8(res2mmio(res, (0x400 - 0x3c0) + index, 0), val); + write8(res2mmio(res, 0x400 + index, 0), val); } static struct resource res_legacy = { |