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authorPatrick Rudolph <patrick.rudolph@9elements.com>2019-05-20 09:21:43 +0200
committerPatrick Georgi <pgeorgi@google.com>2019-05-29 20:01:12 +0000
commitedbcd057e6e8a991c8473a0da05081452db2f8f5 (patch)
tree08e4c8646a56f5979330489fd752c4a6093571cc /Documentation/northbridge/intel/sandybridge
parent702f83897730739af21d10649759589ae9a22203 (diff)
Documentation: Warn about ME cleaner on Sandy Bridge
Document known issues with 'disabled' ME. Change-Id: I364f3ed49341523c781eb2f3b41e866f33632a7e Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/32889 Reviewed-by: Felix Held <felix-coreboot@felixheld.de> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'Documentation/northbridge/intel/sandybridge')
-rw-r--r--Documentation/northbridge/intel/sandybridge/index.md1
-rw-r--r--Documentation/northbridge/intel/sandybridge/me_cleaner.md20
2 files changed, 21 insertions, 0 deletions
diff --git a/Documentation/northbridge/intel/sandybridge/index.md b/Documentation/northbridge/intel/sandybridge/index.md
index dcb090aad6..c1d4b9948d 100644
--- a/Documentation/northbridge/intel/sandybridge/index.md
+++ b/Documentation/northbridge/intel/sandybridge/index.md
@@ -6,3 +6,4 @@ This section contains documentation about coreboot on specific Intel "Sandy Brid
- [Native Ram Initialization](nri.md)
- [RAM initialization feature matrix](nri_features.md)
+- [ME Cleaner](me_cleaner.md)
diff --git a/Documentation/northbridge/intel/sandybridge/me_cleaner.md b/Documentation/northbridge/intel/sandybridge/me_cleaner.md
new file mode 100644
index 0000000000..1086e7e091
--- /dev/null
+++ b/Documentation/northbridge/intel/sandybridge/me_cleaner.md
@@ -0,0 +1,20 @@
+# ME Cleaner
+It's possible to 'clean' the ME partition within the flash medium as part
+of the build process. While cleaning as much code as possible is removed
+from the ME firmware partition. In this state the ME errors out and doesn't
+operate any more.
+
+**Using a 'cleaned' ME partition may lead to issues and its use should be
+carefully evaulated.**
+
+## Observations with 'cleaned' ME
+
+* Instable LPC bus
+ * SuperIO is malfunctioning
+ * TPM is malfunctioning
+ * Random system shutdowns on high bus activity
+
+## Filing bug reports
+
+Always test with unmodified IFD and ME section before reporting bugs to the
+coreboot project.