Messages in this thread |  | | Date | Tue, 3 Apr 2018 09:18:43 +0200 | From | Alexandre Belloni <> | Subject | Re: [PATCH] mtd: nand: raw: atmel: add module param to avoid using dma |
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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 https://bootlin.com
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