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BusyBox v1.37.0 (Debian 1:1.37.0-6+b9) built-in shell (ash)
Enter 'help' for a list of built-in commands.

~ # [6nfor r in /sys/class/remoteproc/*; do [ "$(cat $r/name)" = a204000.remoteproc
 ] && W=$r; done; echo "WCNSS_RP=$W state=$(cat $W/state 2>&1)"
WCNSS_RP=/sys/class/remoteproc/remoteproc1 state=offline
~ # [ -n "$W" ] && [ "$(cat $W/state)" = offline ] && { echo start > $W/state; e
cho "START rc=$?"; }
START rc=0
~ # sleep 15; echo "after15 state=$(cat $W/state 2>&1)"
after15 state=running
~ # [6n