From: Bastian Krause <bst@pengutronix.de>
To: Marc Kleine-Budde <mkl@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH] arch: arm: mach-imx: document field return in CSF template
Date: Fri, 25 Feb 2022 11:46:04 +0100 [thread overview]
Message-ID: <7013be85-751c-b20c-6dff-469ce7401a54@pengutronix.de> (raw)
In-Reply-To: <20220225102552.o4emeawwdhv6ybbv@pengutronix.de>
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@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 */.
Bastian
>
>> +*/
>> +
>> hab [Install Key]
>> /* verification key index in key store (0, 2...4) */
>> hab Verification index = 0
>> --
>> 2.30.2
>>
>>
--
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next prev parent reply other threads:[~2022-02-25 10:48 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-25 10:03 Bastian Krause
2022-02-25 10:25 ` Marc Kleine-Budde
2022-02-25 10:46 ` Bastian Krause [this message]
2022-02-25 10:55 ` Marc Kleine-Budde
2022-02-28 9:30 ` Sascha Hauer
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