sh: Add updating method of SPI ROM to README of sh7757lcr
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/doc/README.sh7757lcr b/doc/README.sh7757lcr
index 49fea50..109f715 100644
--- a/doc/README.sh7757lcr
+++ b/doc/README.sh7757lcr
@@ -61,3 +61,17 @@
ETHERC ch1 = 00:00:87:6c:21:81
GETHERC ch0 = 00:00:87:6c:21:82
GETHERC ch1 = 00:00:87:6c:21:83
+
+
+Update SPI ROM:
+============================
+
+1. Copy u-boot image to RAM area.
+2. Probe SPI device.
+ => sf probe 0
+ 8192 KiB M25P64 at 0:0 is now current device
+3. Erase SPI ROM.
+ => sf erase 0 80000
+4. Write u-boot image to SPI ROM.
+ => sf write 0x89000000 0 80000
+