add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: Basic test for tracers
# flags: instance
test -f available_tracers
for t in `cat available_tracers`; do
  echo $t > current_tracer
done
echo nop > current_tracer