On 02/12/2017 05:15 AM, Friedrich Oslage wrote:
Crossfire requires a mainboard chipset which supports crossfire. Qemu
can emulate a 440fx or q35 chipset, neither of them are listed in AMD's
compatibility chart [1].
AMD stopped using bridging ports a few years ago and switched to XDMA
for GPU intercommunication. That means all communication is done via the
PCI Express port, which requires quite a bit of support in the mainboard
chipset. If would probably be easier to get an older Crossfire version,
one which still uses interconnect bridges, or NVIDIA SLI, to work but
both of them still require some level of support within the mainboard
chipset.
Regards,
Friedrich
[1] http://support.amd.com/en-us/kb-articles/Pages/Crossfire-Chart.aspx
On 02/11/2017 05:33 PM, taii...@gmx.com wrote:
Has anyone tried this? does it work? I heard that you need to modify
the BIOS (Thus seabios) to provide license keys or something like that
or the drivers will refuse to enable it.
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Card to card DMA communication that doesn't involve the host processor
isn't anything special, as long as the root ports and bridge devices
have PCI-e ACS there shouldn't be any issue (which rules out almost
every intel board/cpu as they lack ACS, but I have an AMD opteron so I
am ok)
Literally the only difference between a SLI/Xfire board and one that
isn't is the license flag on the bios tables.
There was this guy who got it working XDMA but that was years ago.
https://www.redhat.com/archives/vfio-users/2015-September/msg00028.html
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