hw/sd.c: Add comment regarding CARD_STATUS_* defines

Add a clarifying comment about what the CARD_STATUS_[ABC]
macros are defining.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Andrzej Zaborowski <andrew.zaborowski@intel.com>

diff --git a/hw/sd.c b/hw/sd.c
index a1c98c0..245b6c3 100644 (file)
--- a/hw/sd.c
+++ b/hw/sd.c
@@ -309,6 +309,11 @@ static void sd_set_rca(SDState *sd)
     sd->rca += 0x4567;
 }
 
+/* Card status bits, split by clear condition:
+ * A : According to the card current state
+ * B : Always related to the previous command
+ * C : Cleared by read
+ */
 #define CARD_STATUS_A  0x02004100
 #define CARD_STATUS_B  0x00c01e00
 #define CARD_STATUS_C  0xfd39a028