[U-Boot] [PATCH] sh: Add updating method of SPI ROM to README of sh7757lcr

[Nobuhiro Iwamatsu]

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj at renesas.com>
---
 doc/README.sh7757lcr |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/doc/README.sh7757lcr b/doc/README.sh7757lcr
index 49fea50..78a9b8f 100644
--- a/doc/README.sh7757lcr
+++ b/doc/README.sh7757lcr
@@ -61,3 +61,17 @@ You can write MAC address to SPI ROM.
 		 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
+
-- 
1.7.7