Re: [coreboot] Fwd: SimNOW VGA int 1a

[Rudolf Marek]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
> > Basically, vga bios tries to size a 16 meg register and at an
> > intermediate point the vga hardware ends up decoding the top 16 mb of
> > memory.

Hi all,

I think one _must_ disable the decoders first by disabling space in PCI_COMMAND
register. Check u-boot how it does:
http://git.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=blob;f=drivers/pci/pci_...

It first disable the cmdstat = (cmdstat & ~(PCI_COMMAND_IO |
PCI_COMMAND_MEMORY)) | PCI_COMMAND_MASTER;

And then goes to decode. VIA bridge has also _default_ enable decode, so it
blows up very badly when probing without decode enabled. Check K8M890
k8t890_bridge.c

Rudolf
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFI+lnD3J9wPJqZRNURAo4CAKCHFtd2ly4lUmEhkUEOUpbU1xqFKwCgnuk0
Ya9mSRkR0WhPBJ8IqQtwPeM=
=FpVN
-----END PGP SIGNATURE-----