Can this be tested in QEMU (with SeaVGABIOS(?))?

i believe yes, it can be tested.

Not as easy as I though it would be. Qemu emulates an external graphics
card by default and includes the option ROM. However, coreboot makes it
hard to use (for reasons I don't understand, CB:4258). It's easy to patch
(see below).

With this config:

    CONFIG_VGA_ROM_RUN=y
    CONFIG_FRAMEBUFFER_SET_VESA_MODE=y
    CONFIG_FRAMEBUFFER_VESA_MODE_USER=y
    CONFIG_FRAMEBUFFER_VESA_MODE=0x1234

I get this:

    $ qemu-system-i386 -bios build/coreboot.rom -serial stdio
    [...]
    PCI: 00:02.0 init ...
    CBFS: 'Master Header Locator' located CBFS at [200:40000)
    CBFS: Locating 'pci1234,1111.rom'
    CBFS: 'pci1234,1111.rom' not found.
    Option ROM address for PCI: 00:02.0 = fe060000
    Copying VGA ROM Image from fe060000 to 0xc0000, 0x9600 bytes
    Calling Option ROM...
    ... Option ROM returned.
    VBE: Getting information about VESA mode 5234
    VBE: Function call failed!

    Error: In vbe_get_mode_info function

Which seems correct regarding VBE spec. But it dies before it can
show the list of supported video modes :-(

diff --git a/src/drivers/emulation/qemu/Kconfig b/src/drivers/emulation/qemu/Kconfig
index 58daaa4487..e1c11a1479 100644
--- a/src/drivers/emulation/qemu/Kconfig
+++ b/src/drivers/emulation/qemu/Kconfig
@@ -1,5 +1,5 @@
 config DRIVERS_EMULATION_QEMU_BOCHS
-       bool "bochs dispi interface vga driver"
+       bool
        default y
        depends on BOARD_EMULATION_QEMU_X86
        depends on MAINBOARD_DO_NATIVE_VGA_INIT
diff --git a/src/mainboard/emulation/qemu-i440fx/Kconfig b/src/mainboard/emulation/qemu-i440fx/Kconfig
index 23526f96d9..e24196bcc4 100644
--- a/src/mainboard/emulation/qemu-i440fx/Kconfig
+++ b/src/mainboard/emulation/qemu-i440fx/Kconfig
@@ -11,7 +11,6 @@ config BOARD_SPECIFIC_OPTIONS
        select HAVE_ACPI_TABLES
        select BOARD_ROMSIZE_KB_256
        select MAINBOARD_HAS_NATIVE_VGA_INIT
-       select MAINBOARD_FORCE_NATIVE_VGA_INIT
        select POSTCAR_STAGE
        select POSTCAR_CONSOLE
 

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