4 May
2011
4 May
'11
5:23 p.m.
On Wed, May 04, 2011 at 01:22:03PM -0300, Glauber Costa wrote:
let me rephrase then: what if you have n vga option roms under fw_cfg's vgaroms/ ?
Then both would be run.
If one were to put two real VGA ROMs in "vgaroms/", then both roms would be run, both would try to map hardware registers to 0xa0000-0xc0000, and things would break.
However, the sgabios isn't a "real" vga rom - it doesn't try to map 0xa0000. Instead, sgabios is just a blob of code that we'd like to run early so that it can hook int10.
The "vgaroms/" capability was added specifically to allow sgabios to run early in the boot.
http://www.coreboot.org/pipermail/coreboot/2009-May/048678.html
-Kevin