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Radeon RV710 memory...
Posted: Sun Aug 14, 2011 8:39 pm
by Nicsoft
Is it possible to get AmigaOS 4.1 update 2 to recognize more than 256MB of memory on my 1GB Radeon RV710 (XFX HD 4550 graphics card)?
Re: Radeon RV710 memory...
Posted: Tue Aug 16, 2011 10:25 pm
by Hans
Nicsoft wrote:Is it possible to get AmigaOS 4.1 update 2 to recognize more than 256MB of memory on my 1GB Radeon RV710 (XFX HD 4550 graphics card)?
No, it's not. The problem is that only 256 MiB is visible to the CPU over the PCIe/PCI bus; the rest is only accessible by the GPU. Since Picasso96 expects that the CPU can write directly to all VRAM, it can only use the VRAM that the CPU can access. The RadeonHD.chip driver currently uses a small portion of the extra VRAM as a temporary buffer for overlapped blits. I'm planning to enable Gallium-3D to use the additional VRAM, but that's still to do.
Hans
Re: Radeon RV710 memory...
Posted: Tue Aug 16, 2011 10:58 pm
by Stephen Robinson
Is this the same problem that Radeon 9250 cards have seeing only 128mb of the 256mb of ram?
Re: Radeon RV710 memory...
Posted: Tue Aug 16, 2011 11:17 pm
by Hans
Stephen Robinson wrote:Is this the same problem that Radeon 9250 cards have seeing only 128mb of the 256mb of ram?
No. Some of the Radeon 9xxx cards have the 256 MiB is split between a primary and secondary PCI device instead of leaving it as one block of RAM. That's a totally different problem.
Hans
Re: Radeon RV710 memory...
Posted: Wed Aug 17, 2011 10:06 am
by Hans-Joerg Frieden
Stephen Robinson wrote:Is this the same problem that Radeon 9250 cards have seeing only 128mb of the 256mb of ram?
As Hans said, it's a different problem. We have tried to place both PCI apperatures so that they form a continuous block, but that doesn't work either. OTOH, I have a Radeon 9250 with 256 MB that has one apperature and that works fine.