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gpt: doc: README: Update README entry for gpt verify extension 

./doc/README.gpt entry has been updated to explain usage of "gpt verify"
command.

Signed-off-by: Lukasz Majewski <l.majewski@majess.pl>
Reviewed-by: Tom Rini <trini@konsulko.com>
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Lukasz Majewski 2015-11-20 08:06:14 +01:00 committed by Tom Rini
parent 5af9dd3739
commit dd445879f7
1 changed files with 26 additions and 1 deletions
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@ -168,9 +168,34 @@ To restore GUID partition table one needs to:
2. Define 'CONFIG_EFI_PARTITION' and 'CONFIG_CMD_GPT'
2. From u-boot prompt type:
3. From u-boot prompt type:
gpt write mmc 0 $partitions
Checking (validating) GPT partitions in U-Boot:
===============================================
Procedure is the same as above. The only change is at point 3.
At u-boot prompt one needs to write:
gpt verify mmc 0 [$partitions]
where [$partitions] is an optional parameter.
When it is not provided, only basic checks based on CRC32 calculation for GPT
header and PTEs are performed.
When provided, additionally partition data - name, size and starting
offset (last two in LBA) - are compared with data defined in '$partitions'
environment variable.
After running this command, return code is set to 0 if no errors found in
on non-volatile medium stored GPT.
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
Partition type GUID:
====================