[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 Linux 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 it don't work:
option ROM_SIZE = 2048*1024-36*1024