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nvmem: stm32: add warning when upper OTPs are updated

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As the upper OTPs are ECC protected, they support only one 32 bits word
programming.
For a second modification of this word, these ECC become invalid and
this OTP will be no more accessible, the shadowed value is invalid.

This patch adds a warning to indicate an upper OTP update, because this
operation is dangerous as OTP is not locked by the driver after the first
update to avoid a second update.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20221118063932.6418-3-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Patrick Delaunay 2022-11-18 06:39:21 +00:00 committed by Greg Kroah-Hartman
parent fbfc4ca465
commit d61784e641
1 changed files with 3 additions and 0 deletions
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3
drivers/nvmem/stm32-romem.c
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@ -132,6 +132,9 @@ static int stm32_bsec_write(void *context, unsigned int offset, void *buf,
}
}
if (offset + bytes >= priv->lower * 4)
dev_warn(dev, "Update of upper OTPs with ECC protection (word programming, only once)\n");
return 0;
}