On 25.02.2022 11:03:44, Bastian Krause wrote: > Activating the field return configuration returns a locked-down board > (nearly) to its open state. In order to burn the FIELD_RETURN fuse, the > CSF must contain a specific unlock command with the device's UID. > > Signed-off-by: Bastian Krause <bst@xxxxxxxxxxxxxx> > --- > .../include/mach/habv4-imx6-gencsf-template.h | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/arch/arm/mach-imx/include/mach/habv4-imx6-gencsf-template.h b/arch/arm/mach-imx/include/mach/habv4-imx6-gencsf-template.h > index a60b485292..45da2981cb 100644 > --- a/arch/arm/mach-imx/include/mach/habv4-imx6-gencsf-template.h > +++ b/arch/arm/mach-imx/include/mach/habv4-imx6-gencsf-template.h > @@ -39,6 +39,18 @@ hab Engine = SETUP_HABV4_ENGINE > hab Features = SETUP_HABV4_FEATURES > #endif > > +/* > +// allow fusing FIELD_RETURN > +// # ocotp0.permanent_write_enable=1 > +// # mw -l -d /dev/imx-ocotp 0xb8 0x1 > +hab [Unlock] > +hab Engine = OCOTP > +hab Features = FIELD RETURN > +// device-specific UID: > +// $ dd if=/sys/bus/nvmem/devices/imx-ocotp0/nvmem bs=4 skip=1 count=2 status=none | hexdump -ve '1/1 "0x%.2x, "' | sed 's/, $//' > +hab UID = 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 You probably want to comment this all out in the template... > +*/ > + > hab [Install Key] > /* verification key index in key store (0, 2...4) */ > hab Verification index = 0 > -- > 2.30.2 > > Marc -- Pengutronix e.K. | Marc Kleine-Budde | Embedded Linux | https://www.pengutronix.de | Vertretung West/Dortmund | Phone: +49-231-2826-924 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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