"Mark S. Mathews" wrote:
> ...... One thing I've noticed is that it won't let me mmap the
> top 1MB of the address space.
That should work, I do this quite regularly. What actually fails,
the mmap() or your access to the mapped region?
There is what I do:
mem_addr = (u_char *)mmap(NULL, FLASH_MEM_SIZE,
(PROT_READ | PROT_WRITE), MAP_SHARED,
mem_fd, FLASH_MEM_ADDR);
#define FLASH_MEM_SIZE and FLASH_MEM_ADDR accordingly. I hope there
isn't some weird arithmetic rounding problem when we hit the top. I
just usually tell this to map the upper 8M bytes.
The MMU doesn't care, if the generic Linux VM subsystem creates the PTEs
it just loads them. I don't remember any code in the mem driver that
would prevent this either. None of this is unique to the 8xx.
-- Dan
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