>>>p453 of his book has a PCI DMA example, where he uses the >>>cpu_to_le32() macros inside calls writel().
>>>However, since these functions are internally implemented to >>>perform LE operations, this example appears to be incorrect. >>>Would you agree? >> No, I think it is correct. I said this without looking up the example you cited. I agree now, the example is incorrect; and yes, file a bug report at oreilly! I think, from memory, that elsewhere in the book Rubini does say that readl()... are for the PCI bus, but cross-arch issues are only addressed in certain sections. I always find out exactly what these macros do on the arch I am using, then I know where I stand. I find LXR (Google it if you don't know it) good for browsing the source of vanilla kernels. After finding out how and where it is done, I then double check the relevant files of the actual kernel I am using. ppc implementations of readl, writel, cpu_to_le32 use the byte- reversed load/store word instructions. Clive
