i7300_edac: Add a FIXME note about the error correction type

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/edac/i7300_edac.c b/drivers/edac/i7300_edac.c
index 7e035b6d0d0f..36265e21fef2 100644
--- a/drivers/edac/i7300_edac.c
+++ b/drivers/edac/i7300_edac.c
@@ -841,6 +841,15 @@ static int decode_mtr(struct i7300_pvt *pvt,
         p_csrow->grain = 8;
         p_csrow->nr_pages = dinfo->megabytes << 8;
         p_csrow->mtype = MEM_FB_DDR2;
+
+        /*
+         * FIXME: the type of error detection actually depends of the
+         * mode of operation. When it is just one single memory chip, at
+         * socket 0, channel 0, it uses  8-byte-over-32-byte SECDED+ code.
+         * In normal or mirrored mode, it uses Single Device Data correction,
+         * with the possibility of using an extended algorithm for x8 memories
+         * See datasheet Sections 7.3.6 to 7.3.8
+         */
         p_csrow->edac_mode = EDAC_S8ECD8ED;
 
         /* ask what device type on this row */