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?
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