[LinuxBIOS] Linuxbios is always 421bytes larger than allowed

[Tao Liu]

Hello,

I updated the code to try amd64's cache_as_ram feature, and during
making got the error:

./buildrom linuxbios.strip linuxbios.rom
../../../payloads/eb_8111_filo.zelf 0x17800 0x40000
linuxbios image is 96677 bytes; only 96256 allowed
Linuxbios input file larger than allowed size!

if I enlarge the ROM_IMAGE_SIZE in Options.lb, the linuxbios image
enlarges also,
and is always 421bytes larger than ROM_IMAGE_SIZE. Are there some misconfigures
for linking the linuxbios image?

Regards,
Liu Tao