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- From d61784e6410f3df2028e6eb91b06ffed37a660e0 Mon Sep 17 00:00:00 2001
- From: Patrick Delaunay <[email protected]>
- Date: Fri, 18 Nov 2022 06:39:21 +0000
- Subject: [PATCH] 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 <[email protected]>
- Signed-off-by: Srinivas Kandagatla <[email protected]>
- Link: https://lore.kernel.org/r/[email protected]
- Signed-off-by: Greg Kroah-Hartman <[email protected]>
- ---
- drivers/nvmem/stm32-romem.c | 3 +++
- 1 file changed, 3 insertions(+)
- --- a/drivers/nvmem/stm32-romem.c
- +++ b/drivers/nvmem/stm32-romem.c
- @@ -132,6 +132,9 @@ static int stm32_bsec_write(void *contex
- }
- }
-
- + if (offset + bytes >= priv->lower * 4)
- + dev_warn(dev, "Update of upper OTPs with ECC protection (word programming, only once)\n");
- +
- return 0;
- }
-
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