On 11/09/2012 02:22 AM, Piotr Wilczek wrote:
Documentation of the GPT format.
diff --git a/doc/README.gpt b/doc/README.gpt
+Introduction: +============= +This document describes the GPT partition table format when used with u-boot.
Why "when used with U-Boot"; U-Boot shouldn't influence the GPT structure at all.
+GPT for marking disks/partitions is using the UUID. It is supposed to be a +globally unique value. A UUID is a 16-byte (128-bit) number. The number of +theoretically possible UUIDs is therefore about 3 × 10^38. +More often UUID is stored as 32 hexadecimal digits, displayed in 5 groups
I don't think "stored" is too likely; "displayed" is more likely.
+Example usage: +==============
I would change that headline to something like "Creating GPTs in U-Boot"; all the text above describes the GPT format itself, whereas this text describes the specifics of some U-Boot commands, and so is not an example of the preceding text.
+To restore GUID partition table one needs to: +1. at ./include/configs/{board}.h
I don't think "at ./include/configs/{board}.h" is correct; you need to define the partitions variable in the environment. The config file is one way you could do this. I would re-write this as:
1. Define partition layout in the environment. ./include/configs/{board}.h may provide a value that describes the recommended layout if desired.
- define "partitions=" environment variable with format:
"name=..,size=..,uuid=..;..."values for every key can be passed as text or environment variableexamples:"name=u-boot,size=60M;name=kernel,size=60M;name=platform,size=1G;""name=${uboot_name},size=${uboot_size},uuid=${uboot_uuid};..."+2. From u-boot prompt type:
- gpt mmc 0
- or
- gpt mmc 0 partitions
Shouldn't that be "${partitions}" not "partitions"?
+For "emergency" usage (or when list of UUIDs cannot be provided) the internal +GUID generator shall be used. It uses gd->start_addr_sp as a primary source of +UUID generator (16B).
What does "(16B)" mean here?