I have gcc version:
gcc (GCC) 3.4.5 (Gentoo 3.4.5, ssp-3.4.5-1.0, pie-8.7.9)
The unordered IO mapping gives this information in its help text:
CONFIG_UNORDERED_IO:
Use unordered stores to access IO memory mappings in device drivers.
Still very experimental. When a driver works on IA64/ppc64/pa-
risc it should
work with this option, but it makes the drivers behave differently
from i386. Requires that the driver writer used memory barriers
properly.
Symbol: UNORDERED_IO [=n]
Prompt: Unordered IO mapping access
Defined at arch/x86_64/Kconfig:515
Depends on: EXPERIMENTAL
Location:
-> Bus options (PCI etc.)
Hope this is helpful.
Thanks,
Brian
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