option rom dump from Linux

http://www.coreboot.org/VGA_support

cat /proc/iomem |head -n 3|tail -n 1|(read m; m=${m/ :*}; s=${m/-*}; e=${m/*-}; dd if=/dev/mem of=vgabios.bin bs=1c skip=$[0x$s] count=$[$[0x$e]-$[0x$s]+1])

will dump the 3rd option rom.