Issue in using mmap on ARM target

[Lothar Waßmann]

Hi,

> I am facing one issue when executing below progmra on ARM target. The
> same program work well on X86 host machine,
> 
> When execute on Host(x86). the result are as expected.
> [root at localhost naveen]# ./a.out  0000 b 2
> /dev/mem opened.
> Memory mapped at address 0xb7f00000.
> Value at address 0x0 (0xb7f00000): 0x24
> Written 0x2; readback 0x2
> 
> But when execute on Target(ARM):
> # ./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 ....
> 
There is no RAM at (physical) address 0.
You should check the PHYS_OFFSET setting of your machine to find out
where your RAM is located.


Lothar Waßmann
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