diff --git a/hw/sh4/r2d.c b/hw/sh4/r2d.c
index 28ed6be05b..e2c46b8f8a 100644
--- a/hw/sh4/r2d.c
+++ b/hw/sh4/r2d.c
@@ -43,7 +43,7 @@
 #include "exec/address-spaces.h"
 
 #define FLASH_BASE 0x00000000
-#define FLASH_SIZE 0x02000000
+#define FLASH_SIZE (16 * MiB)
 
 #define SDRAM_BASE 0x0c000000 /* Physical location of SDRAM: Area 3 */
 #define SDRAM_SIZE 0x04000000
@@ -287,12 +287,20 @@ static void r2d_init(MachineState *machine)
     sysbus_mmio_map(busdev, 1, 0x1400080c);
     mmio_ide_init_drives(dev, dinfo, NULL);
 
-    /* onboard flash memory */
+    /*
+     * Onboard flash memory
+     * According to the old board user document in Japanese (under
+     * NDA) what is referred to as FROM (Area0) is connected via a
+     * 32-bit bus and CS0 to CN8. The docs mention a Cypress
+     * S29PL127J60TFI130 chipsset.  Per the 'S29PL-J 002-00615
+     * Rev. *E' datasheet, it is a 128Mbit NOR parallel flash
+     * addressable in words of 16bit.
+     */
     dinfo = drive_get(IF_PFLASH, 0, 0);
     pflash_cfi02_register(0x0, NULL, "r2d.flash", FLASH_SIZE,
                           dinfo ? blk_by_legacy_dinfo(dinfo) : NULL,
-                          16 * KiB, FLASH_SIZE >> 16,
-                          1, 4, 0x0000, 0x0000, 0x0000, 0x0000,
+                          64 * KiB, FLASH_SIZE >> 16,
+                          1, 2, 0x0001, 0x227e, 0x2220, 0x2200,
                           0x555, 0x2aa, 0);
 
     /* NIC: rtl8139 on-board, and 2 slots. */