Hi,
I would like to test the System Trace Macrocell component on the board, but probably I am overlooking something. I am trying out the steps mentioned at https://lists.linaro.org/pipermail/coresight/2018-August/001653.html.
I recompiled the kernel with the configuration flags for STM and FTRACE enabled. Also I patched the device tree file msm8916.dtsi to include STM.
The following commands from the steps in the post linked above work fine:
$ echo 1 > /sys/devices/platform/soc/825000.etf/tmc_etf0/enable_sink
$ echo 1 > /sys/devices/platform/soc/802000.stm/stm0/enable_source
$ echo function > /sys/kernel/debug/tracing/current_tracer
$ echo schedule > /sys/kernel/debug/tracing/set_ftrace_filter
However the following fails:
$ echo 802000.stm > /sys/devices/virtual/stm_source/console/stm_source_link
bash: echo: write error: Invalid argument
$ echo stm > /sys/devices/virtual/stm_source/console/stm_source_link
bash: echo: write error: Invalid argument
$ echo stm0 > /sys/devices/virtual/stm_source/console/stm_source_link
bash: echo: write error: Invalid argument
(Executed the commands as root user)
Does anyone have experience with STM on the board that can point me in the right direction?
Thank you,
Enes
