The option rom of the Marvell 88SE9230 card shows on a normal boot a 

bios screen. When pressing CTRL-m quick enough, you  can interrupt the 

bootprocess and enter a menue wherer you can define raid 

arrays.  

When booting seabios inside KVM the bootprocess is very slow.

There is a 1 min holdtime where the cpu is about 30%. The screen is 

black with only the seabios version string shown. I suspect that 

the passed-through Marvell 88SE9230 cards option roms causes this behaviour. 

Maybe the scanning for option rom cause the slow bootprocess?

In the seabios boot case no bios menue is shown, after