IIM on iMX27 "how-to" needed

[Sascha Hauer]

On Fri, Feb 10, 2012 at 03:13:00PM +0100, Igor Trevisan wrote:
> Sorry,
> 
> I replied to Sasha privately and not to the list!
> 
> 
> On Fri, Feb 10, 2012 at 2:05 PM, Igor Trevisan <igt1972 at gmail.com> wrote:
> >>
> >> You could try imx_iim0.explicit_sense_enable=0, maybe this helps.
> >>
> >
> > Again... This helps!
> > Sorry, I misunderstood the logic of the sense flag!
> > (I think I owe you at least a beer...;)
> >
> > By the way, now I can read the first two banks:
> >
> > barebox:/  md -b -s /dev/imx_iim_bank1
> > 00000000: 41 ce 3c ad 4d 89 93 00 00 00 00 00 00 00 00 00    A.<.M...........
> > 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
> > barebox:/
> > barebox:/
> > barebox:/  md -b -s /dev/imx_iim_bank0
> > 00000000: 59 20 81 40 20 00 00 00 00 00 00 00 00 00 00 00    Y .@ ...........
> > 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
> >
> > Now I would like to go further and try to program some fuse bits
> > (I need to store some codes...).
> > I think I need first of all to set:
> > imx_iim0.permanent_write_enable=1
> >
> > I did this, then I tried to write with
> >
> > mw -b 0x10028814 0xbb
> >
> > but reading back I still find:
> > barebox:/  md -b -s /dev/imx_iim_bank0
> > 00000000: 59 20 81 40 20 00 00 00 00 00 00 00 00 00 00 00    Y .@ ...........
> > 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
> >
> > Which is the right way to write the fuse bits?

Try

mw -d /dev/imx_iim_bank0 -b 0x2 0x80

to change the the '0x80' at offset 2 to 0x80.

I suggest that you explore the usage of 'mw' with something less
sensitive than the fuses, they have the potential to brick your board...

Sascha

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