Da Zheng, le Sat 24 Apr 2010 19:39:58 +0800, a écrit : > If a variable doesn't have the volatile qualifier and If it is in a register > at > the moment it is modified by DMA, the value in the register is out-of-date.
Yes, that's why the DMA order must use compiler memory barriers to
prevent that: asm("":::"memory"). But that's all it needs to do,
provided the DMA chip handles cache coherency.
Samuel
