On 10.02.2018 19:57, Arthur Heymans wrote: > "[email protected]" <[email protected]> writes: >> I would like to add this information to the wiki so I am wondering if >> anyone has successfully used for instance dual 8GB graphics cards with >> coreboot. >> > I don't think that this gpu memory is mapped into the linear memory > space. Such a GPU will typically have a PCI memory resource BAR that is > (only) 256M large (could be 512M or more these days). > >> I am not sure if this would be an issue due to coreboot only having >> 32bit MMIO space. >> > It depends a bit on how things are configured but with a fairly common > 2G mmio space below 4G I think it is unlikely for 2 external GPU's to be > an issue. > > It would of course be nice to have 64bit BAR support but that would > require substantial changes in the allocator and more importantly a lot > of time spend in a sane and thoughtful design...
I think Myles Watson (not 100% sure) worked on an improved resource allocator with 64 bit resource support for v3. I do not know if it ever was merged in v4, or if that was instead a port of the v2 allocator to v3, in which case this would be mostly what we have now. The mails about this are mostly from 2009. Regards, Carl-Daniel -- coreboot mailing list: [email protected] https://mail.coreboot.org/mailman/listinfo/coreboot
