On Sat, Jun 30, 2012 at 12:01 PM, Kyösti Mälkki <[email protected]> wrote: > On Sat, 2012-06-30 at 18:18 +0200, Denis 'GNUtoo' Carikli wrote: >> Hi, >> >> me and Kyösti Mälkki(kmalkki on IRC) figured out how to workarround the >> following problem: >> If I installed 4GB of ram in the m4a785t-m the screen comes up,however >> it's black. >> If I only installed 2GB of ram it worked fine. >> >> I made a patch(I'll send it right after that email) but it seem to break >> graphics for the case where 2GB of ram is installed. >> >> So I wonder what would be the correct fix(a fix that would work for >> every cases). >> >> Explanation of the patch that will be sent right after the mail: >> "basek - mmio_basek;" should be 1048576 (1G): >> According to Kyösti Mälkki the correct value for the sizek is 1048576. >> So I looked for what could create that size and found that. >> I'm not convinced that "basek - mmio_basek" is the right fix but at >> least we're in the right direction. > > My explanation of the issue: uma_memory_size must reduce the size of the > last RAM resource _below_ 4GB. It now touches the last RAM resource, > even if located over 4GB.
Yes, The UMA graphics memory is allocated in the lower 4GB. I think that should be happening in mainboard.c. See the AMD reference platforms. Regards, Marc -- http://se-eng.com -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
