ARM: mach-shmobile: ap4evb: Add tiny document

Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 42 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/board-ap4evb.c b/arch/arm/mach-shmobile/board-ap4evb.c
index 4fd9ec8735d6..41bc2487de4d 100644
--- a/arch/arm/mach-shmobile/board-ap4evb.c
+++ b/arch/arm/mach-shmobile/board-ap4evb.c
@@ -35,6 +35,48 @@
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
 
+/*
+ * Address      Interface               BusWidth        note
+ * ------------------------------------------------------------------
+ * 0x0000_0000  NOR Flash ROM (MCP)     16bit           SW7 : bit1 = ON
+ * 0x0800_0000  user area               -
+ * 0x1000_0000  NOR Flash ROM (MCP)     16bit           SW7 : bit1 = OFF
+ * 0x1400_0000  Ether (LAN9220)         16bit
+ * 0x1600_0000  user area               -               cannot use with NAND
+ * 0x1800_0000  user area               -
+ * 0x1A00_0000  -
+ * 0x4000_0000  LPDDR2-SDRAM (POP)      32bit
+ */
+
+/*
+ * NOR Flash ROM
+ *
+ *  SW1  |     SW2    | SW7  | NOR Flash ROM
+ *  bit1 | bit1  bit2 | bit1 | Memory allocation
+ * ------+------------+------+------------------
+ *  OFF  | ON     OFF | ON   |    Area 0
+ *  OFF  | ON     OFF | OFF  |    Area 4
+ */
+
+/*
+ * NAND Flash ROM
+ *
+ *  SW1  |     SW2    | SW7  | NAND Flash ROM
+ *  bit1 | bit1  bit2 | bit2 | Memory allocation
+ * ------+------------+------+------------------
+ *  OFF  | ON     OFF | ON   |    FCE 0
+ *  OFF  | ON     OFF | OFF  |    FCE 1
+ */
+
+/*
+ * SMSC 9220
+ *
+ *  SW1         SMSC 9220
+ * -----------------------
+ *  ON          access disable
+ *  OFF         access enable
+ */
+
 /* MTD */
 static struct mtd_partition nor_flash_partitions[] = {
         {