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35 lines
1.3 KiB
Diff
35 lines
1.3 KiB
Diff
From d61784e6410f3df2028e6eb91b06ffed37a660e0 Mon Sep 17 00:00:00 2001
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From: Patrick Delaunay <patrick.delaunay@foss.st.com>
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Date: Fri, 18 Nov 2022 06:39:21 +0000
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Subject: [PATCH] nvmem: stm32: add warning when upper OTPs are updated
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As the upper OTPs are ECC protected, they support only one 32 bits word
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programming.
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For a second modification of this word, these ECC become invalid and
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this OTP will be no more accessible, the shadowed value is invalid.
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This patch adds a warning to indicate an upper OTP update, because this
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operation is dangerous as OTP is not locked by the driver after the first
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update to avoid a second update.
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Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
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Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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Link: https://lore.kernel.org/r/20221118063932.6418-3-srinivas.kandagatla@linaro.org
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/nvmem/stm32-romem.c | 3 +++
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1 file changed, 3 insertions(+)
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--- a/drivers/nvmem/stm32-romem.c
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+++ b/drivers/nvmem/stm32-romem.c
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@@ -132,6 +132,9 @@ static int stm32_bsec_write(void *contex
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}
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}
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+ if (offset + bytes >= priv->lower * 4)
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+ dev_warn(dev, "Update of upper OTPs with ECC protection (word programming, only once)\n");
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+
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return 0;
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}
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