MMIO and gcc re-ordering issue

Benjamin Herrenschmidt benh at
Fri May 30 11:13:23 EST 2008

> I do -- in all the drivers for on-chip peripherals that are shared
> between AT91 ARM (LE) and AVR32 (BE). Since everything goes on inside
> the chip, we must use LE accesses on ARM and BE accesses on AVR32.
> Currently, this is the only interface I know that can do native-endian
> accesses, so if you take it away, I'm gonna need an alternative
> interface that doesn't do byteswapping.

Are you aware that these also don't provide any ordering guarantee ?


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