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....@oss.nxp.com> > Sent: Thursday, January 11, 2024 11:51 AM > To: Thomas Schäfer <thomas.schae...@kontron.com>; 'u-boot@lists.denx.de' > <u-boot@lists.denx.de>; Ye Li <ye...@nxp.com> > Cc: Peng Fan <peng....@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.schae...@kontron.com > > www.kontron.com > > > > > > > > > > Kontron Europe GmbH > > Heinrich-Barth-Straße 1-1a | 66115 Saarbrücken | Germany
