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Subject[PATCH 1/2] nvmem: stm32: add warning when upper OTPs are updated
Date
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>
---

drivers/nvmem/stm32-romem.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/nvmem/stm32-romem.c b/drivers/nvmem/stm32-romem.c
index 354be526897f..e3c3c333b5d1 100644
--- a/drivers/nvmem/stm32-romem.c
+++ b/drivers/nvmem/stm32-romem.c
@@ -133,6 +133,9 @@ 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;
}

--
2.25.1
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