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-rw-r--r--Documentation/northbridge/intel/sandybridge/index.md1
-rw-r--r--Documentation/northbridge/intel/sandybridge/nri_features.md89
2 files changed, 90 insertions, 0 deletions
diff --git a/Documentation/northbridge/intel/sandybridge/index.md b/Documentation/northbridge/intel/sandybridge/index.md
index 815abcefb5..dcb090aad6 100644
--- a/Documentation/northbridge/intel/sandybridge/index.md
+++ b/Documentation/northbridge/intel/sandybridge/index.md
@@ -5,3 +5,4 @@ This section contains documentation about coreboot on specific Intel "Sandy Brid
## Topics
- [Native Ram Initialization](nri.md)
+- [RAM initialization feature matrix](nri_features.md)
diff --git a/Documentation/northbridge/intel/sandybridge/nri_features.md b/Documentation/northbridge/intel/sandybridge/nri_features.md
new file mode 100644
index 0000000000..6305e78622
--- /dev/null
+++ b/Documentation/northbridge/intel/sandybridge/nri_features.md
@@ -0,0 +1,89 @@
+# RAM initialization feature matrix
+
+## Options
+
+1. Native raminit
+ * Open Source
+ * Native Raminit is working for most frequencies on most boards.
+ * There might be errors to fix.
+ * Position in romstage doesn't matter.
+2. mrc.bin raminit
+ * Closed Source (aka BLOB)
+ * No known errors.
+ * Needs to be placed at fixed offset in romstage.
+
+## Native raminit implemented features
+
+```eval_rst
++---------------------------+----------------------+-------------+---------+---------------------+
+| Option | Supported | Implemented | Working | Description |
++===========================+======================+=============+=========+=====================+
+| **Supported channels** |
++---------------------------+----------------------+-------------+---------+---------------------+
+| single and dual channel | yes | yes | yes | |
++---------------------------+----------------------+-------------+---------+---------------------+
+| Up to 4 slots | yes | yes | yes | |
++---------------------------+----------------------+-------------+---------+---------------------+
+| Up to 4 ranks per channel | yes | yes | yes | |
++---------------------------+----------------------+-------------+---------+---------------------+
+| **Supported frequencies** |
++---------------------------+----------------------+-------------+---------+---------------------+
+| DDR3-1066 (533MHz) | yes | yes | yes | |
++---------------------------+----------------------+-------------+---------+---------------------+
+| DDR3-1600 (800MHz) | yes | yes | yes | |
++---------------------------+----------------------+-------------+---------+---------------------+
+| DDR3-1866 (933MHz) | yes | yes | yes | |
++---------------------------+----------------------+-------------+---------+---------------------+
+| DDR3-2133 (1066MHz) | yes | yes | yes | |
++---------------------------+----------------------+-------------+---------+---------------------+
+| DDR3-1400 (700MHz) | yes (IvyBridge only) | yes | yes | Since coreboot 4.6 |
++---------------------------+----------------------+-------------+---------+---------------------+
+| DDR3-1800 (900MHz) | yes (IvyBridge only) | yes | yes | Since coreboot 4.6 |
++---------------------------+----------------------+-------------+---------+---------------------+
+| DDR3-2000 (1000MHz) | yes (IvyBridge only) | yes | yes | Since coreboot 4.6 |
++---------------------------+----------------------+-------------+---------+---------------------+
+| DDR3-2200 (1100MHz) | yes (IvyBridge only) | yes | yes | Since coreboot 4.6 |
++---------------------------+----------------------+-------------+---------+---------------------+
+| DDR3-2400 (1200MHz) | yes (IvyBridge only) | yes | yes | Since coreboot 4.6 |
++---------------------------+----------------------+-------------+---------+---------------------+
+| DDR3-1800 (900MHz) | yes (IvyBridge only) | yes | yes | Since coreboot 4.6 |
++---------------------------+----------------------+-------------+---------+---------------------+
+| **Supported CAS latencies** |
++---------------------------+----------------------+-------------+---------+---------------------+
+| CL6 | yes | yes | ? | |
++---------------------------+----------------------+-------------+---------+---------------------+
+| CL7 | yes | yes | ? | |
++---------------------------+----------------------+-------------+---------+---------------------+
+| CL8 | yes | yes | ? | |
++---------------------------+----------------------+-------------+---------+---------------------+
+| CL9 | yes | yes | ? | |
++---------------------------+----------------------+-------------+---------+---------------------+
+| CL10 | yes | yes | yes | |
++---------------------------+----------------------+-------------+---------+---------------------+
+| CL11 | yes | yes | yes | |
++---------------------------+----------------------+-------------+---------+---------------------+
+| CL12 | yes | yes | ? | Since coreboot 4.6 |
++---------------------------+----------------------+-------------+---------+---------------------+
+| CL13 | yes | yes | yes | Since coreboot 4.6 |
++---------------------------+----------------------+-------------+---------+---------------------+
+| CL14 | yes | yes | ? | Since coreboot 4.6 |
++---------------------------+----------------------+-------------+---------+---------------------+
+| CL15 | yes | yes | ? | Since coreboot 4.6 |
++---------------------------+----------------------+-------------+---------+---------------------+
+| **MRC cache (stored timings of last training)** |
++---------------------------+----------------------+-------------+---------+---------------------+
+| S3 | yes | yes | yes | |
++---------------------------+----------------------+-------------+---------+---------------------+
+| normal boot | yes | yes | yes | reset on CRC16 diff |
++---------------------------+----------------------+-------------+---------+---------------------+
+| **XMP support** |
++---------------------------+----------------------+-------------+---------+---------------------+
+| XMP Profile 1 | yes | yes | yes | only 1.5 V profiles |
++---------------------------+----------------------+-------------+---------+---------------------+
+| XMP Profile 2 | yes | yes | no | not activated |
++---------------------------+----------------------+-------------+---------+---------------------+
+| **ECC support** |
++---------------------------+----------------------+-------------+---------+---------------------+
+| ECC | yes | no | | |
++---------------------------+----------------------+-------------+---------+---------------------+
+```