Dear Stephen, and all
> Have you tried check_mem_region and request_mem_region? They would
> seem to be the appropriate incantations here.
>
I'm not sure but I think this 2 functions are only available in V2.3. In
my case I use a
V2.2.
> Alternatively, if you know
> that you are the only one using the board you can just ignore the
> check/request mechanisms entirely. I know that this is bad form, but I am a
> fan of expedience over form in such cases.
>
When I write to my memory LOOKUP, and read it immediately,
the read and the write are identical but If I read it just after, it
seems
the whole memory is filled with the last value
The following source is part of my program. I write a value
in memory pointed by ptr and write it at the address
LOOKUP+lookup.offset+i. Then I read again all the values
written.
for (i=0;i<lookup.size;i++){
*(u32 *)(LOOKUP+lookup.offset+i) = *ptr;
printk("@%x %d %d\n",(u32 *)(LOOKUP+lookup.offset+i),*ptr++,*(u32
*)(LOOKUP+lookup.offset+i));
}
for (i=0;i<lookup.size;i++){
printk("@%x %d \n",(u32 *)(LOOKUP+lookup.offset+i),*(u32
*)(LOOKUP+lookup.offset+i));
}
the first loop "printk" at the console the correct result :
Aug 16 17:22:36 kernel: @c2b5f050 0 0
Aug 16 17:22:36 kernel: @c2b5f054 1379419973 1379419973
Aug 16 17:22:36 kernel: @c2b5f058 -1536127350 -1536127350
Aug 16 17:22:36 kernel: @c2b5f05c -156707377 -156707377
Aug 16 17:22:36 kernel: @c2b5f060 1222712596 1222712596
Aug 16 17:22:36 kernel: @c2b5f064 -1692834727 -1692834727
Aug 16 17:22:36 kernel: @c2b5f068 -313414754 -313414754
Aug 16 17:22:36 kernel: @c2b5f06c 1066005219 1066005219
Aug 16 17:22:36 kernel: @c2b5f070 -1849542104 -1849542104
Aug 16 17:22:36 kernel: @c2b5f074 -470122131 -470122131
but the second one is not correct :
Aug 16 17:22:36 kernel: @c2b5f050 -470122131
Aug 16 17:22:36 kernel: @c2b5f054 -470122131
Aug 16 17:22:36 kernel: @c2b5f058 -470122131
Aug 16 17:22:36 kernel: @c2b5f05c -470122131
Aug 16 17:22:36 kernel: @c2b5f060 -470122131
Aug 16 17:22:36 kernel: @c2b5f064 -470122131
Aug 16 17:22:36 kernel: @c2b5f068 -470122131
Aug 16 17:22:36 kernel: @c2b5f06c -470122131
Aug 16 17:22:36 kernel: @c2b5f070 -470122131
Aug 16 17:22:36 kernel: @c2b5f074 -470122131
What's hapening ????
thanks
Fred
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