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SubjectRe: [PATCH] mtd: nand: raw: atmel: add module param to avoid using dma
On 02/04/2018 at 22:23:17 +0200, Peter Rosin wrote:
> >> No, but did it again and checked, see transcript below.
> >
> > I don't use devmem2. Is 'readback' information accurate or is it
> > always what's been written? Because when you write 0x33 to 0xFFFFECBC,
> > 0x33 is read back, but just after that, when you read it again it's 0.
> Looking at the devmem2 source, it seems very likely that the compiler
> optimizes out the read and thus outputs what has been written.

At least on x86, it is not optimized out.

Alexandre Belloni, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering

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