On Tue, Oct 27, 2009 at 04:24:53PM -0600, Jonathan Haws wrote:

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How can I get that pointer?  Unfortunately I cannot simply use

the

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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?

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/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