Hi All,
What is the best practice to redirect the Ftrace output over STM? Can we use the existing module "stm_console" and redirect the Ftrace output as a kernel message by : # cat trace_pipe > /dev/kmsg
Other question please: How can the "stm_core" module knows the STM base address?
Best regards, Jonatan
Good day Jonatan,
On 8 February 2016 at 14:29, jonatan okagaw jonatan.okagao@gmail.com wrote:
Hi All,
What is the best practice to redirect the Ftrace output over STM? Can we use the existing module "stm_console" and redirect the Ftrace output as a kernel message by : # cat trace_pipe > /dev/kmsg
We did several attempts to redirect Ftrace output to STM and it can be tricky. The Ftrace subsystem wasn't designed to do string formatting in real-time, which makes it so efficient. The solution we settled on is sourced from one of our member, ST-Microelectronics, and will be published in the coming two weeks. You can either monitor the linux-arm-kernel mailing list or we can CC you on the submission - whichever works best for you.
Other question please: How can the "stm_core" module knows the STM base address?
The STM core is only a layer abstracting implementation details from the various STM engine. The stm core uses callbacks specific to each STM driver. Those drivers take the base address for the configuration and stimulus blocks from the device tree.
Thanks, Mathieu
Best regards, Jonatan
CoreSight mailing list CoreSight@lists.linaro.org https://lists.linaro.org/mailman/listinfo/coresight
Hello Mathieu,
Thank you for the information! I will subscribe in the linux-arm-kernel mailing list to check the submission.
Best regards, Jonatan
2016-02-09 16:18 GMT+01:00 Mathieu Poirier mathieu.poirier@linaro.org:
Good day Jonatan,
On 8 February 2016 at 14:29, jonatan okagaw jonatan.okagao@gmail.com wrote:
Hi All,
What is the best practice to redirect the Ftrace output over STM? Can we use the existing module "stm_console" and redirect the Ftrace
output
as a kernel message by : # cat trace_pipe > /dev/kmsg
We did several attempts to redirect Ftrace output to STM and it can be tricky. The Ftrace subsystem wasn't designed to do string formatting in real-time, which makes it so efficient. The solution we settled on is sourced from one of our member, ST-Microelectronics, and will be published in the coming two weeks. You can either monitor the linux-arm-kernel mailing list or we can CC you on the submission - whichever works best for you.
Other question please: How can the "stm_core" module knows the STM base address?
The STM core is only a layer abstracting implementation details from the various STM engine. The stm core uses callbacks specific to each STM driver. Those drivers take the base address for the configuration and stimulus blocks from the device tree.
Thanks, Mathieu
Best regards, Jonatan
CoreSight mailing list CoreSight@lists.linaro.org https://lists.linaro.org/mailman/listinfo/coresight
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jonatan okagao -
jonatan okagaw
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Mathieu Poirier