[Bug 28813] [GM45] broken swizzling in swap-in/out paths/L-shaped memory swizzling

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28813

--- Comment #41 from Chris Wilson <chris at chris-wilson.co.uk> ---
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.

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