i.MX Processors中的主题 Re: Boot Time for FreeRTOS in M4 core

Boot Time for FreeRTOS in M4 core

ajmalali — Mon, 17 Sep 2018 04:15:30 GMT

Hi,

I am using FreeRTOS on the m4 core on the i.MX8QXP MEK. I am using the 2.3 SDK(Beta) from NXP. How can find the boot up time of FreeRTOS? Is there any mechanism to calculate it.

Regards,

Ajmal

Re: Boot Time for FreeRTOS in M4 core

jamesbone — Mon, 17 Sep 2018 12:59:40 GMT

Hello Ajmalali,

Unfortunately the BSP it is still in Beta version and we are not able to have this number of time of the booting process since it is not finish. Nevertheless I need to tell you that you need first to boot with the Cortex A using Uboot then you can Boot from FreeRTOS.

Have a great day,
TIC

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Re: Boot Time for FreeRTOS in M4 core

ajmalali — Mon, 17 Sep 2018 13:35:05 GMT

Hi james,

For clarity, Are you suggesting that i need to boot the A-35 (linux) core first and then boot the M4 core second for me to be able to measure the boot Time for FreeRTOS on M4 core?

Regards,

Ajmal

Re: Boot Time for FreeRTOS in M4 core

ajmalali — Mon, 15 Oct 2018 08:43:57 GMT

Hi,

I came across something in my analysis and i want to validate it.

In the API reference manual, there are API's available for TSTMR (Timestamp Timer), a free running incrementing counter that starts running after system reset de-assertion and can be read at any time by the software for determining the software ticks.

What i am confused about is whether this timer is enabled by default or do we need to do initialize the same? if its enabled by default, can i just use this for boot time measurement?

Regards,

Ajmal