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>
diff --git a/arch/arm/mach-shmobile/board-ap4evb.c b/arch/arm/mach-shmobile/board-ap4evb.c
index 4fd9ec8..41bc248 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[] = {
{