On 06/10/08 16:55 +0100, Stephen Crocker wrote: > Jordan Crouse wrote: > > On 06/10/08 16:24 +0100, Stephen Crocker wrote: > >> Jordan Crouse wrote: > >>> On 06/10/08 15:31 +0100, Stephen Crocker wrote: > >>>> Carl-Daniel Hailfinger wrote: > >>>>> On 03.10.2008 12:29, Stephen Crocker wrote: > >>>>>> Is there a way of getting VGA support with SeaBIOS on the AMD Geode LX > >>>>>> framebuffer? I have successfully built and tested a BIOS image that > >>>>>> appears to boot into DOS but the lack of display means that it is of > >>>>>> little use. Is there a VGA ROM image that I can include? > >>>>> You'd need a VGA emulation VSA and AFAIK that piece of software is not > >>>>> available as open source due to an interesting rights situation. > >>>> How much of this is handled in AMD's binary VSA module? I have been > >>>> looking through both the AMD and OpenVSA source and it looks as if the > >>>> lxvg module is supposed to handle VGA SMIs but I cannot find where this > >>>> is actually done. > >>> None of it - the VGA is actually a seperate component under difference > >>> licensing. Thats why you don't see it in the VSA code. > >> This is quite an important point, as a lot of programs access the I/O > >> ports and framebuffer directly. A VGA BIOS would be able to handle the > >> functions provided by INT 10 but in my experience, that would not be > >> enough. > > > > Not sure what you are trying to say here - beyond the PCI emulation, the > > VSA neither grants nor restricts access to the graphics hardware. This > > is why we have been able to get away without VGA up to this point - both > > the libpayload driver and the kernel framebuffer drivers are perfectly > > good replacements for standard int 10 behavior. > > I was under the impression that the Geode display hardware does not > provide the standard I/O ports and memory areas exposed by standard VGA > hardware (eg. ports 3d4/3d5 and segment A000) and that this was all > emulated in the VSA using SMIs. Am I incorrect about this?
Oh, I see what you mean - I thought you meant you have no access to the GPU outside of VSA/VGA. Yes, I believe that is correct for VGA users. Jordan -- Jordan Crouse Systems Software Development Engineer Advanced Micro Devices, Inc. -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
