Re: fram device driver

[Erik Mouw <mouw@xxxxxxxxxxxx>]

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On Thu, Apr 05, 2007 at 09:00:51PM +0530, krishna.vamsi@xxxxxxxxx wrote:
> I have ppc board, and I can see a new device FRAM on it.

Ferroelectric RAM, according to the datasheet.

> AFAIK, we are not using it for any purpose.
> 
> I wanted to write the Device Driver for the same, But I'm not sure where
> to start. 
> 
> I have read LDD3 but I'm clueless on how to start Writing driver for
> this.
> 
> Data sheet for the can be found here :
> http://www.ramtron.com/lib/literature/datasheets/FM18L08ds_r3.2.pdf
> 
> It would be gr8 help if u can give me some pointers.. 

Either let the kernel use it directly like any other RAM (only 32kB so
not very useful), or make a character device driver that can be
mmap()'ed into userspace:

  int fd = open(/dev/fram);
  char *fram = mmap(fd);
  *fram = 42;


Erik

- -- 
They're all fools. Don't worry. Darwin may be slow, but he'll
eventually get them. -- Matthew Lammers in alt.sysadmin.recovery
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