[coreboot] "Size of CBFS filesystem in ROM" parameter?

[Rafael Send]

Hi,
I'm trying to understand what the "Size of CBFS filesystem in ROM" setting
actually does.

If I make the size of the ROM chip large enough to contain my kernel &
initrd (~15MB in this case) how do I need to modify this parameter?

I've read  up on the CBFS documentation, and while that provides good
information on the CBFS layout & function, I was not able to connect the
dots with the sizing parameter. Enlarging the value too much resulted in a
failed build whereas enlarging it somewhat caused a working kernel to fail
to load.

If anyone could provide some pointers, they would be greatly appreciated!

Cheers,
R