Re: [Bochs-developers] [Qemu-devel] [PATCH 0/3] Add BIOS splashimage support

Sebastian Herbszt
2008-12-17T22:59:05Z

Carl-Daniel Hailfinger wrote:
> On 16.12.2008 22:51, Laurent Vivier wrote:
>> But in fact, my first idea was to read the image data from the
>> configuration device (which is always possible with LOGO_CMD_OFFSET),
>> but when I saw how it has been done in VirtualBox, I though it was a
>> good idea.

Vbox used MMIO and port I/O before moving the splash support to the VGA device.

> Modern x86 BIOSes read the splash screen from the BIOS ROM and the
> settings from NVRAM (sometimes the BIOS ROM is used for that as well by
> reflashing a sector of the ROM on every boot).

I think Vbox used run-length encoding for the innotek logo bitmap. Its size was
about 10 KB. If this could be used for Bochs we could put the logo into rombios32.bin
and load it from the 0xe000 segment. This should be comparable to other BIOSes.

- Sebastian