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tools: Add a README note about fw_printenv lock file
Add a mention of the lock file to the README for the fw_printenv tool. Signed-off-by: Joe Hershberger <joe.hershberger@ni.com> Reported-by: Luka Perkov <uboot@lukaperkov.net>
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@ -55,3 +55,7 @@ partition where the environment resides.
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DEVICEx_ENVSECTORS defines the number of sectors that may be used for
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this environment instance. On NAND this is used to limit the range
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within which bad blocks are skipped, on NOR it is not used.
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To prevent losing changes to the environment and to prevent confusing the MTD
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drivers, a lock file at /var/lock/fw_printenv.lock is used to serialize access
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to the environment.
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