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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [GM45] broken swizzling in swap-in/out paths/L-shaped memory swizzling"
href="https://bugs.freedesktop.org/show_bug.cgi?id=28813#c41">Comment # 41</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [GM45] broken swizzling in swap-in/out paths/L-shaped memory swizzling"
href="https://bugs.freedesktop.org/show_bug.cgi?id=28813">bug 28813</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>Found a potential lead in the 4 series chipset datasheet:
5.2.1
CHDECMISC—Channel Decode Miscellaneous
B/D/F/Type: 0/0/0/MCHBAR
Address Offset:111h
Default Value:00h
Access: R/W/L, R/W
Size: 8 bits
Bit 4, written by bios then locked:
L-Shaped GFX Tile Cycle (LGFXTLCYC): This bit forces
graphics tiled cycles in L-shaped memory configuration to
modify bit 6 of the address. This field should be set to 1
only when L-mode memory configuration is enabled and
should be set to 0 for all other memory configurations.
This bit is locked by ME stolen Memory lock.</pre>
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