Re: [PATCH master] i.MX: HAB: fix i.MX8MP field-return fuse

[SCHNEIDER Johannes <johannes.schneider@leica-geosystems.com>]

Hoi,

>
> On 25-03-10, Ahmad Fatoum wrote:
> > Hello Marco,
> >
> > On 3/10/25 12:36, Marco Felsch wrote:
> > > Current tests showed that fusing just the single field-return bit(0) on
> > > i.MX8MP SoCs brick the device.
> >
> > So such a device is bricked permanently with no way to upload
> > a bootloader again to fuse the remainder of the bits?
>
> Yes, as written here [3], the device isnow in "device asserts security
> violation" state, what ever this means but maybe: "I refuse to power
> up".

The imx does consume power, but does "nothing", e.g. does not boot from emmc,
say anything on the hardware serial or even enumerate the usb side.
And pulling the boot-mode pins to serial-download mode does also nothing,
even though the serial-dl is usually the one last and common fallback.

>
> [3] https://lore.kernel.org/all/a9ebece9-4ab6-4bca-bebe-985e0bf95278@oss.nxp.com/
>
> > Interesting thing to not document :/
>
> Took us 2 devices to figure it out :/ We also don't know why NXP doesn't
> care and don't update the (S)TRM since the v1 of [3] is 9months old.
>
> Regards,
>   Marco
>

gruß
Johannes