[LinuxBIOS] VGA Console does not start if ROM_SIZE > 512

[Alan Carvalho de Assis]

Hi guys,
I am testing LinuxBIOS on 2MB flash in tyan s2850.

If I compile LinuxBIOS to 512KB (-36KB from VGA ROM) and complete the
head of ROM file with 0's to get 2MB everything work fine, LinuxBIOS
starts and I can see the GRUB menu on VGA monitor.

This is the working option:
option ROM_SIZE = 512*1024-36*1024

If I change it to 1MB or 2MB VGA console don't work:
option ROM_SIZE = 2048*1024-36*1024

But serial console and everything (except VGA) still working.

I searched for something related to it on source code, but don't found
anything about it.

How to fix this problem?

Cheers,

[Stefan Reinauer]

* Alan Carvalho de Assis  [070128 21:02]:
> This is the working option:
> option ROM_SIZE = 512*1024-36*1024
>
> If I change it to 1MB or 2MB VGA console don't work:
> option ROM_SIZE = 2048*1024-36*1024

If you change the ROM_SIZE you also need to change the start of 
the vga bios:

register "rom_address" = "0xfff80000"

should be

register "rom_address" = "0xffe00000"

for a 2MB image

[Alan Carvalho de Assis]

Hi Stefan,

2007/1/28, Stefan Reinauer :
> If you change the ROM_SIZE you also need to change the start of
> the vga bios:
>
> register "rom_address" = "0xfff80000"
>
> should be
>
> register "rom_address" = "0xffe00000"
> for a 2MB image

thank you very much.

It works perfectly now.

Cheers,

Alan