AW: FIELD_RETURN on i.MX8MNANOLPD4 EVK

[Thomas Schaefer]

Hi Ye,

Yes, I can boot SPL without signature. I also added some debug messages to my build and I can see that SPL can load u-boot proper via USB until 'Jumping to U-Boot' message in board_init_r function (common/spl/spl.c)

Actually this looks like the SError problem caused by errata ERR050350 which has been worked around in patch 2f3c92060dcd. But that patch is currently active in u-boot and so I don't understand what the problem is here in this case.

Best regards,
Thomas

-----Ursprüngliche Nachricht-----
Von: Ye Li <ye.li at nxp.com> 
Gesendet: Donnerstag, 11. Januar 2024 05:09
An: Peng Fan (OSS) <peng.fan at oss.nxp.com>; Thomas Schaefer <thomas.schaefer at kontron.com>; 'u-boot at lists.denx.de' <u-boot at lists.denx.de>
Cc: Peng Fan <peng.fan at nxp.com>
Betreff: RE: FIELD_RETURN on i.MX8MNANOLPD4 EVK

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I think there is no particular SW support needed for FIELD_RETURN on 8MN.
From what you described, you have moved the part from closed to FIELD_RETURN. So are you able to boot into SPL without signature?

Best regards,
Ye Li
> -----Original Message-----
> From: Peng Fan (OSS) <peng.fan at oss.nxp.com>
> Sent: Thursday, January 11, 2024 11:51 AM
> To: Thomas Schäfer <thomas.schaefer at kontron.com>; 'u-boot at lists.denx.de'
> <u-boot at lists.denx.de>; Ye Li <ye.li at nxp.com>
> Cc: Peng Fan <peng.fan at nxp.com>
> Subject: Re: FIELD_RETURN on i.MX8MNANOLPD4 EVK
>
> +Ye
>
> 在 1/9/2024 4:52 PM, Thomas Schaefer 写道:
> > Hi all,
> >
> > We are trying to enable FIELD RETURN on the NXP i.MX8MNano LPD4 EVK
> board.
> >
> > We enabled Secure Boot in u-boot in the first step. After checking 
> > proper
> execution of a signed bootloader image we closed the board blowing the 
> SEC_CONFIG fuse.
> >
> > In the next step we created the board specific signature with UID of 
> > the CPU
> included to remove the FIELD RETURN lock. After that we were able to 
> blow the FIELD_RETURN fuse with 'fuse prog 8 3 0x1' command. But now, 
> the board cannot boot any more, it will hang after execution of the SPL bootloader part.
> >
> > We can observe this behavior with both signed and unsigned 
> > bootloader
> images.
> >
> > Is the FIELD_RETURN feature for the i.MX8MNano supported with u-boot
> v2024.01?
> >
> > Best regards,
> > Thomas
> >
> >
> > Thomas Schäfer
> > SW Design Engineer
> >
> > thomas.schaefer at kontron.com
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> >
> >
> >
> >
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