Commit d61784e6 authored by Patrick Delaunay's avatar Patrick Delaunay Committed by Greg Kroah-Hartman
Browse files

nvmem: stm32: add warning when upper OTPs are updated 



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: default avatarPatrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: default avatarSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20221118063932.6418-3-srinivas.kandagatla@linaro.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent fbfc4ca4

drivers/nvmem/stm32-romem.c

+3 −0
Original line number Diff line number Diff line
@@ -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;

}