how to pass log level to 7 from u-boot

[Tomek The Messenger]

Hi
You can change log level in linux runtime
echo 7 > /proc/sys/kernel/printk
however my device hangs on fastly after I am able to write anything through
serial console.
Does anybody of You know how to pass it from u-boot? I can stop in u-boot
and pass log level 7 but I don't know what command should I write in order
to do it.
BR
Tomek
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