diff options
| author | Patrick Delaunay <patrick.delaunay@foss.st.com> | 2022-11-18 06:39:21 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-11-23 19:44:52 +0100 |
| commit | d61784e6410f3df2028e6eb91b06ffed37a660e0 (patch) | |
| tree | 1a60cf6a880600ea70d982d2026e23c909259dff | |
| parent | fbfc4ca465a1f8d81bf2d67d95bf7fc67c3cf0c2 (diff) | |
| download | linux-d61784e6410f3df2028e6eb91b06ffed37a660e0.tar.bz2 | |
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: 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>
| -rw-r--r-- | drivers/nvmem/stm32-romem.c | 3 |
1 files changed, 3 insertions, 0 deletions
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; } |