Blackfin: bf537-stamp: comment CF-Flash Card Support better

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

diff --git a/include/configs/bf537-stamp.h b/include/configs/bf537-stamp.h
index 98300db..74b9ecd 100644 (file)
--- a/include/configs/bf537-stamp.h
+++ b/include/configs/bf537-stamp.h
@@ -178,9 +178,28 @@
 /*
  * CF-CARD IDE-HDD Support
  */
-/* #define CONFIG_BFIN_TRUE_IDE */     /* Add CF flash card support */
-/* #define CONFIG_BFIN_CF_IDE */       /* Add CF flash card support */
-/* #define CONFIG_BFIN_HDD_IDE */      /* Add IDE Disk Drive (HDD) support */
+
+/*
+ * Add CF flash card support in TRUE-IDE Mode (CF-IDE-NAND Card)
+ * Strange address mapping Blackfin A13 connects to CF_A0
+ */
+
+/* #define CONFIG_BFIN_TRUE_IDE */
+
+/*
+ * Add CF flash card support in Common Memory Mode (CF-IDE-NAND Card)
+ * This should be the preferred mode
+ */
+
+/* #define CONFIG_BFIN_CF_IDE */
+
+/*
+ * Add IDE Disk Drive (HDD) support
+ * See example interface here:
+ * http://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:drivers:ide-blackfin
+ */
+
+/* #define CONFIG_BFIN_HDD_IDE */
 
 #if defined(CONFIG_BFIN_CF_IDE) || \
     defined(CONFIG_BFIN_HDD_IDE) || \
@@ -218,7 +237,7 @@
 #define CONFIG_SYS_ATA_DATA_OFFSET     0x0020  /* data I/O */
 #define CONFIG_SYS_ATA_REG_OFFSET      0x0020  /* normal register accesses */
 #define CONFIG_SYS_ATA_ALT_OFFSET      0x001C  /* alternate registers */
-#define CONFIG_SYS_ATA_STRIDE          2       /* CF.A0 --> Blackfin.Ax */
+#define CONFIG_SYS_ATA_STRIDE          2       /* CF.A0 --> Blackfin.A13 */
 
 #elif defined(CONFIG_BFIN_CF_IDE)
 #define CONFIG_SYS_ATA_BASE_ADDR       0x20211800
@@ -226,7 +245,7 @@
 #define CONFIG_SYS_ATA_DATA_OFFSET     0x0000  /* data I/O */
 #define CONFIG_SYS_ATA_REG_OFFSET      0x0000  /* normal register accesses */
 #define CONFIG_SYS_ATA_ALT_OFFSET      0x000E  /* alternate registers */
-#define CONFIG_SYS_ATA_STRIDE          1       /* CF.A0 --> Blackfin.Ax */
+#define CONFIG_SYS_ATA_STRIDE          1       /* CF_A0=0, with /CE1 /CE2 odd/even byte selects */
 
 #elif defined(CONFIG_BFIN_HDD_IDE)
 #define CONFIG_SYS_ATA_BASE_ADDR       0x20314000