Hi Tom,
I'm cc'ing the mailing list.
On Sun, Jul 13, 2008 at 11:59:59AM -0400, Tom Sylla wrote:
Along the way, you have mentioned that SeaBIOS should run the VGA ROM instead of coreboot. How do I build my ROM to make that happen? My VGA is integrated, so I usually prepend the ROM, and coreboot runs it. How will SeaBIOS find it?
I think coreboot should load the option roms into ram.
There is no standard way to do this in coreboot-v2. What other platforms seem to do is hardcode certain addresses in the C code and then just memcpy them from flash to ram. On my via, I hacked the code so that it still copies the vga option rom, but does not run it.
However, it should be possible to setup a standard in coreboot-v3. Each rom could go in a LAR file and coreboot could copy them. For example, we could define a directory "/optionroms/" and each file could automatically be uncompressed and copied.
-Kevin
On Sun, Jul 13, 2008 at 11:59:59AM -0400, Tom Sylla wrote:
Along the way, you have mentioned that SeaBIOS should run the VGA ROM instead of coreboot. How do I build my ROM to make that happen? My VGA is integrated, so I usually prepend the ROM, and coreboot runs it. How will SeaBIOS find it?
Kevin O'Connor wrote:
I think coreboot should load the option roms into ram.
Does this imply that SeaBIOS doesn't include VGABIOS by default?
Is VGABIOS the only open source VGA BIOS supported by coreboot?
Does SeaBIOS support VGABIOS?
Does SeaBIOS run on the bare hardware that has been initialized by coreboot? Or does it only run via qemu?
Sorry, the coreboot Wiki doesn't seem to provide answers to the above questions.
Sincerely,
Ken Fuchs
On Mon, Jul 14, 2008 at 05:27:05PM -0500, Ken.Fuchs@bench.com wrote:
Does this imply that SeaBIOS doesn't include VGABIOS by default?
It does not.
Is VGABIOS the only open source VGA BIOS supported by coreboot?
I believe VGABIOS is the only open source VGA BIOS that exists.
Does VGABIOS work on any hardware that is supported by coreboot? If so, it should work with coreboot.
Does SeaBIOS support VGABIOS?
Does VGABIOS work on the hardware that is supported by SeaBIOS?
Does SeaBIOS run on the bare hardware that has been initialized by coreboot? Or does it only run via qemu?
SeaBIOS runs also on real hardware, as a coreboot payload, but is still in early stages of development.
//Peter
On Mon, Jul 14, 2008 at 05:27:05PM -0500, Ken.Fuchs@bench.com wrote:
On Sun, Jul 13, 2008 at 11:59:59AM -0400, Tom Sylla wrote:
Along the way, you have mentioned that SeaBIOS should run the VGA ROM instead of coreboot. How do I build my ROM to make that happen? My VGA is integrated, so I usually prepend the ROM, and coreboot runs it. How will SeaBIOS find it?
Kevin O'Connor wrote:
I think coreboot should load the option roms into ram.
Does this imply that SeaBIOS doesn't include VGABIOS by default?
Seabios does not include a vga bios. The vga bios is specific to the vga hardware on the board - I don't think one can implement a generic vga bios.
Is VGABIOS the only open source VGA BIOS supported by coreboot?
Not sure what you mean. There is a gpl'd vgabios for use with emulators (qemu/bochs/etc). It wont run on real hardware.
Does SeaBIOS support VGABIOS?
Sure - it will run the vga bios that comes with the vga chip.
Many integrated vga chips don't have their own separate rom chips for the vga bios. In these cases, hardware vendors will typically just include the code in the main flash chip. In this case, coreboot has to be able to load the rom from flash into memory so that seabios can run it.
Does SeaBIOS run on the bare hardware that has been initialized by coreboot? Or does it only run via qemu?
Seabios runs on my epia-m with just "bare hardware". There have been some other success reports, but it is still in an early stage.
Seabios also runs fine on qemu.
-Kevin
-
Ken.Fuchs＠bench.com -
Kevin O'Connor -
Peter Stuge