[coreboot] VSA and vm86/x86emu

Marc Jones marc.jones at amd.com
Mon Feb 18 23:55:25 CET 2008

Carl-Daniel Hailfinger wrote:
> Hi,
> it seems that executing VSA requires vm86 to be useful. Since we
> unconditionally execute the VSA, we should unconditionally require vm86
> support (PCI_OPTION_ROM_RUN_VM86) via Kconfig for Geode targets. Not
> doing so will either cause compile failures or runtime failures.
> Adding
> below
> did not work out for me.
> Any ideas?
> Regards,
> Carl-Daniel

Sorry I missed this.

VSA requires the GDT that is in vm86.c. VSA loads similar to an option 
ROM so the loader does go into VM86 mode. All the other stuff like 
interrupt support and PCI BIOS isn't needed by VSA. I think that the GDT 
at the top of vm86.c can be moved to a header file, gdt.h or something 
like that.

Care to make a patch? :)


Marc Jones
Senior Firmware Engineer
(970) 226-9684 Office
mailto:Marc.Jones at amd.com

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