[PATCH] arch: arm: mach-imx: document field return in CSF template

[Marc Kleine-Budde]

On 25.02.2022 11:46:04, Bastian Krause wrote:
> On 2/25/22 11:25, Marc Kleine-Budde wrote:
> > 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 at pengutronix.de>
> > > ---
> > >   .../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...
> 
> I don't get it, that's all inside the /* commented section */.

Doh!

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
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