Re: [PATCH 2/2] nvmem: imx: Swap only the first 6 bytes of the MAC address

[Christian Eggers <ceggers@arri.de>]

Hi Fabio, hi Steffen,

On Friday, 11 July 2025, 14:05:16 CEST, Fabio Estevam wrote:
> Hi Christian,
> 
> On Fri, Jul 11, 2025 at 9:01 AM Christian Eggers <ceggers@arri.de> wrote:
> >
> > Since commit 55d4980ce55b ("nvmem: core: support specifying both: cell
> > raw data & post read lengths"), the aligned length (e.g. '8' instead of
> > '6') is passed to the read_post_process callback. This causes that the 2
> > bytes following the MAC address in the ocotp are swapped to the
> > beginning of the address. As a result, an invalid MAC address is
> > returned and to make it even worse, this address can be equal on boards
> > with the same OUI vendor prefix.
> >
> > Fixes: 55d4980ce55b ("nvmem: core: support specifying both: cell raw data & post read lengths")
> > Signed-off-by: Christian Eggers <ceggers@arri.de>
> > Cc: stable@vger.kernel.org
> > ---
> > Tested on i.MX6ULL, but I assume that this is also required for.
> > imx-ocotp-ele.c (i.MX93).
> 
> Steffen has recently sent a similar fix:
> 
> https://lore.kernel.org/linux-arm-kernel/20250708101206.70793-1-steffen@innosonix.de/
> 
> Does this work for you?
your patch does obviously the same as mine. So the answer is 'yes'

regards,
Christian