On Mon, Sep 20, 2010 at 11:57 AM, Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx> wrote:
Hi...
<some message deleted....>
On Mon, Sep 20, 2010 at 12:11, naveen yadav <yad.naveen@xxxxxxxxx> wrote:
> Hi all,
>
> I am facing one issue when executing below progmra on ARM target. The
> same program work well on X86 host machine,
> But when execute on Target(ARM):First thing first, have you checked the permission of /dev/mem?
> # ./a.out 0 w 20
> /dev/mem opened.
> Memory mapped at address 0x40003000.
> Value at address 0x0 (0x40003000): 0xEA000006
> Written 0x14; readback 0xEA000006
> #
> The value does not change. any idea ....
this program has read/write permission on /dev/mem. Otherwise, open would have failed.
--
regards,
Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
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I guess this issue has something to do with '/dev/mem' being physical memory. The address may have different value when data is set and different data when value is read due to page swapping or copy-on-write. I am just taking wild guess here, please correct me if I am wrong.
-Vinit
