[modem-up] before:
/sys/class/remoteproc/remoteproc0 4080000.remoteproc offline mba.mbn
[modem-up] starting: LD_PRELOAD=/usr/lib/linebuf.so rmtfs -r -P -s -v
[modem-up] after 20s:
/sys/class/remoteproc/remoteproc0 4080000.remoteproc running