Messages in this thread Patch in this message | | | From | Patrick Delaunay <> | Subject | [PATCH v2 2/3] nvmem: stm32: add warning when upper OTPs are updated | Date | Mon, 17 Oct 2022 17:49:56 +0200 |
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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> ---
(no changes since v1)
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 d93baee01d7b..bb8aa72ba2f9 100644 --- a/drivers/nvmem/stm32-romem.c +++ b/drivers/nvmem/stm32-romem.c @@ -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; } -- 2.25.1
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