[EXT] AW: FIELD_RETURN on i.MX8MNANOLPD4 EVK

[Ye Li]

Hi Thomas,

	It is due to ARMV8_SPL_EXCEPTION_VECTORS not enabled by default in upstream. I will send a patch 

Best regards,
Ye Li
> -----Original Message-----
> From: Thomas Schaefer <Thomas.Schaefer at kontron.com>
> Sent: Thursday, January 11, 2024 9:40 PM
> To: Ye Li <ye.li at nxp.com>; Peng Fan (OSS) <peng.fan at oss.nxp.com>;
> 'u-boot at lists.denx.de' <u-boot at lists.denx.de>
> Cc: Peng Fan <peng.fan at nxp.com>
> Subject: [EXT] AW: FIELD_RETURN on i.MX8MNANOLPD4 EVK
> 
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> 
> 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
> 
> [You don't often get email from ye.li at nxp.com. Learn why this is important at
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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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