On 8/12/25 11:40, Kane Chen wrote:
From: Kane-Chen-AS <kane_c...@aspeedtech.com>
Add documentation for the OTP memory module used by AST2600 and AST1030
SoCs, and describe options for using a pre-generated image or an
internal buffer. Include example commands for configuration and image
generation.
Signed-off-by: Kane-Chen-AS <kane_c...@aspeedtech.com>
---
docs/system/arm/aspeed.rst | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/docs/system/arm/aspeed.rst b/docs/system/arm/aspeed.rst
index bf18c56347..6317c0e910 100644
--- a/docs/system/arm/aspeed.rst
+++ b/docs/system/arm/aspeed.rst
@@ -243,6 +243,37 @@ under Linux), use :
-M ast2500-evb,bmc-console=uart3
+OTP Option
+^^^^^^^^^^
+
+Both the AST2600 and AST1030 chips use the same One Time Programmable
+(OTP) memory module, which is utilized for configuration, key storage,
+and storing user-programmable data. This OTP memory module is managed
+by the Secure Boot Controller (SBC). The following options can be
+specified or omitted based on your needs.
+
+ * When the options are specified, the pre-generated configuration
+ file will be used as the OTP memory storage.
+
+ * When the options are omitted, an internal memory buffer will be
+ used to store the OTP memory data.
+
+.. code-block:: bash
+
+ -blockdev driver=file,filename=otpmem.img,node-name=otp \
+ -global aspeed-otp.drive=otp \
+
+The following bash command can be used to generate a default
+configuration file for OTP memory:
+
+.. code-block:: bash
+
+ if [ ! -f otpmem.img ]; then
+ for i in $(seq 1 2048); do
+ printf '\x00\x00\x00\x00\xff\xff\xff\xff'
+ done > otpmem.img
+ fi
+
Aspeed 2700 family boards (``ast2700-evb``)
==================================================================
Reviewed-by: Cédric Le Goater <c...@redhat.com>
Thanks,
C.
