Yosemite/440EP why are readl()/ioread32() setup to readlittle-endian?

[Jenkins, Clive]

>>>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