Oooh, looks interesting. I did not actually know what subtractive decoding is. Now I do. After talking to the local PCI guy, it means that the cs5530 will only claim the transaction if it doesn't see anyone else assert devsel# for some number of cycles. I will try this out soon. Thanks very much Peter.
--- Peter Stuge <[EMAIL PROTECTED]> wrote: > On Wed, Mar 09, 2005 at 05:08:20PM -0800, ramesh > bios wrote: > > Yes, I was, or actually, am doubtful as well. I > would > > have thought, for sure, you can turn off the > cs5530a's > > claim of reads on that address block. But so far I > > can't find any way to do that, and it doesn't seem > > like anyone else has either. > > Perhaps setting the ROM interface to subtractive > decoding will help? > > F0 Index 5Bh, Decode Control Register 2, Bit 5 > > BIOS ROM Positive Decode: Selects PCI positive or > subtractive > decoding for accesses to the configured ROM space. > > 0 = Subtractive; 1 = Positive. > ROM configuration is at F0 Index 52h[2:0]. > > It resets to 1. > > (Page 94 in the data sheet.) > > > //Peter > _______________________________________________ > Linuxbios mailing list > Linuxbios@clustermatic.org > http://www.clustermatic.org/mailman/listinfo/linuxbios > __________________________________ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/ _______________________________________________ Linuxbios mailing list Linuxbios@clustermatic.org http://www.clustermatic.org/mailman/listinfo/linuxbios
