Use correct spelling of "U-Boot"

Correct spelling of "U-Boot" shall be used in all written text
(documentation, comments in source files etc.).

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/board/freescale/mpc832xemds/README b/board/freescale/mpc832xemds/README
index 4142aa9..d141cd3 100644
--- a/board/freescale/mpc832xemds/README
+++ b/board/freescale/mpc832xemds/README
@@ -97,7 +97,7 @@
 		make MPC832XEMDS_config
 		make
 
-	MPC832x support PCI 33MHz and PCI 66MHz, to make u-boot support PCI:
+	MPC832x support PCI 33MHz and PCI 66MHz, to make U-Boot support PCI:
 
 		1)Make sure the DIP SW support PCI mode as described in Section 1.1.
 
@@ -113,7 +113,7 @@
 
 	tftp 10000 u-boot.bin
 
-5.1 Reflash U-boot Image using U-boot
+5.1 Reflash U-Boot Image using U-Boot
 
 	tftp 20000 u-boot.bin
 	protect off fe000000 fe0fffff