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