X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=doc%2FREADME.gpt;h=62013a3f89e2ed753915e82f969f98db19df516f;hb=f5e73a34eddea4fb7c5e3d984b86f395996a64cd;hp=c415145236f2552dde5f7fbd1791aa9738afe59d;hpb=73d6d18b7147c90d6f8a60acb8dad663a225e63d;p=platform%2Fkernel%2Fu-boot.git

diff --git a/doc/README.gpt b/doc/README.gpt
index c415145..62013a3 100644
--- a/doc/README.gpt
+++ b/doc/README.gpt
@@ -1,10 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0+
 #
 #  Copyright (C) 2012 Samsung Electronics
 #
 #  Lukasz Majewski <l.majewski@samsung.com>
-#
-#
-# SPDX-License-Identifier:	GPL-2.0+
 
 Glossary:
 ========
@@ -210,16 +208,24 @@ Following line can be used to assess if GPT verification has succeed:
 U-BOOT> gpt verify mmc 0 $partitions
 U-BOOT> if test $? = 0; then echo "GPT OK"; else echo "GPT ERR"; fi
 
+Renaming GPT partitions from U-Boot:
+====================================
 
-The GPT functionality may be tested with the 'sandbox' board by
-creating a disk image as described under 'Block Device Emulation' in
-board/sandbox/README.sandbox:
+GPT partition names are a mechanism via which userspace and U-Boot can
+communicate about software updates and boot failure.  The 'gpt guid',
+'gpt read', 'gpt rename' and 'gpt swap' commands facilitate
+programmatic renaming of partitions from bootscripts by generating and
+modifying the partitions layout string.  Here is an illustration of
+employing 'swap' to exchange 'primary' and 'backup' partition names:
 
-=>host bind 0 ./disk.raw
-=> gpt read host 0
-[ . . . ]
-=> gpt flip host 0
-[ . . . ]
+U-BOOT> gpt swap mmc 0 primary backup
+
+Afterwards, all partitions previously named 'primary' will be named
+'backup', and vice-versa.  Alternatively, single partitions may be
+renamed.  In this example, mmc0's first partition will be renamed
+'primary':
+
+U-BOOT> gpt rename mmc 0 1 primary
 
 The GPT functionality may be tested with the 'sandbox' board by
 creating a disk image as described under 'Block Device Emulation' in
@@ -228,7 +234,7 @@ board/sandbox/README.sandbox:
 =>host bind 0 ./disk.raw
 => gpt read host 0
 [ . . . ]
-=> gpt flip host 0
+=> gpt swap host 0 name othername
 [ . . . ]
 
 Partition type GUID: