On Tue, Oct 27, 2009 at 04:24:53PM -0600, Jonathan Haws wrote:
>> >>> How can I get that pointer? Unfortunately I cannot simply use
>> the
>> >>>
>> >> address of the flash. Is there some magical function call that
>> >> gives me access to that portion of the memory space?
>> >>
>> >> $ man 2 mmap
>> >>
>> >> You want MAP_SHARED and O_SYNC.
>> >>
>> >
>> >
>> > To use that I need to have a file descriptor to a device, do I
>> not? However, I do not have a base flash driver to give me that
>> file descriptor. Am I missing something with that call?
>> >
>>
>> /dev/mem
>>
>Okay, I now have access to the flash memory, however when I write to it the
>writes do not take. I have tried calling msync() on the mapping to no avail.
>I have opened the fd with O_SYNC, but cannot get things to work right.
>
>Here are the calls:
>
> int fd = open("/dev/mem", O_SYNC | O_RDWR);
> uint16_t * flash = (uint16_t *)mmap(NULL, NOR_FLASH_SIZE,
> (PROT_READ | PROT_WRITE), MAP_PRIVATE, fd,
> NOR_FLASH_BASE_ADRS);
What board and CPU are you using? Is your flash really at 0xFC800000, or is
that the virtual address that VxWorks puts it at?
josh
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/linuxppc-dev
