mpc8641 image size cleanup

e600 does not have a bootpg restriction.
Move the version string to beginning of image at fff00000.
Resetvec.S is not needed.
Update flash copy instructions.
Add tftpflash env variable

Signed-off-by: Ed Swarthout <Ed.Swarthout@freescale.com>
Signed-off-by: Jon Loeliger <jdl@freescale.com>
diff --git a/doc/README.mpc8641hpcn b/doc/README.mpc8641hpcn
index 3b88f8b..ac56cca 100644
--- a/doc/README.mpc8641hpcn
+++ b/doc/README.mpc8641hpcn
@@ -96,14 +96,17 @@
 
 	tftp 1000000 u-boot.bin
 	protect off all
-	erase fff00000 ffffffff
-	cp.b 1000000 fff00100 80000
+	erase fff00000 +$filesize
+	cp.b 1000000 fff00000 $filesize
+
+or use tftpflash command:
+	run tftpflash
 
 To Flash U-boot into the alternative bank (0xFF800000 - 0xFFBFFFFF):
 
 	tftp 1000000 u-boot.bin
-	erase ffb00000 ffbfffff
-	cp.b 1000000 ffb00100 80000
+	erase ffb00000 +$filesize
+	cp.b 1000000 ffb00000 $filesize
 
 
 4. Memory Map