Found it, posting it to the list for the benefit of others:
"Porting LinuxBIOS to the AMD SC520: A Follow-up Report" [This has the nifty diagram of how all the *_SIZE options work together] http://www.linuxjournal.com/article/8310
"LinuxBIOS at Four" http://www.linuxjournal.com/article/7170
Ronald G Minnich wrote:
Also, does anyone have a good explaination of:
ROM_SIZE (Appears to be total size of your rom chip) ROM_IMAGE_SIZE (Size of this rom image, fallback or normal), defaults to $10000 (64K) ROM_SECTION_OFFSET=0x10000 ??? ROM_SECTION_SIZE=0x30000 ??? ROM section == total used by LB minus VGA rom size???
see my linux journal article on the web. I think that's where it is. There is a figure there that might clear it up.
Or I can send you the article directly.
ron