AM62P: AM62Px: Invalid boot time optimization measures from Linux SDK tutorial

Fan Bomiao

Part Number: AM62P

Hi,

Following the linux SDK tutorial (4.1.12. Boot Time Optimizations — Processor SDK AM62Px Documentation ), I tried to verify the feasibility of three listed measures (Skipping OSPI PHY tuning/Use DDR in single rank configuration/FastXSPI) to optimize the SBL load time. But I found all of three measures have little effects on reducing the load time. My test result is attached below.

The MCU+SDK version I am using is 11.01.01.08 and the hardware I am using for test is EVM. I set the GPIO low at the start of project "ospi_sbl1" and then I set the GPIO high after function "App_bootMultipleCoreFlash" in project "ipc_rpmsg", as same as the content of tutorials.

I could also attach my test projects below.

ipc_rpmsg.zip ospi_sbl1.zip

Regards,

Bomiao

6 months ago

0 Meet Thakar 6 months ago

TI__Mastermind 21515 points

Hi Bomiao.

The effects of these measures on the SBL timing are not benchmarked in the given documentation, so I will need to run the same experiments at my end to check if I also observe the same timings. Please expect an update by the mid of next week.

Best Regards.

Meet.

0 Fan Bomiao 6 months ago in reply to Meet Thakar

Prodigy 230 points

Hi Meet,

I want to double-check the status of this thread so far.

Regards,

Bomiao

0 Meet Thakar 6 months ago in reply to Fan Bomiao

TI__Mastermind 21515 points

Hi Bomiao,

I also observe similar results at my end:

Optimization	Measurement
None	244ms
Skip PHY tuning	244ms
DDR Single Rank +Skip PHY tuning	240ms
Fast XSPI + DDR Single Rank +Skip PHY tuning	240ms

The numbers mentioned in the processor SDK are based upon MCU+SDK version 9.x, since then many optimizations seem to be included in the SDK by default. You can observe the change in the time measurement from SDK V9.1 to V11.1:

https://software-dl.ti.com/mcu-plus-sdk/esd/AM62PX/09_01_00_39/exports/docs/api_guide_am62px/DATASHEET_AM62PX_EVM.html#autotoc_md48

https://software-dl.ti.com/mcu-plus-sdk/esd/AM62PX/11_01_00_16/exports/docs/api_guide_am62px/DATASHEET_AM62PX_EVM.html#autotoc_md138

Check the time taken for System_init and SBL Board_driversOpen specifically.It seems that these timings are not reflected in the processor SDK documentation, but the numbers you are observing seem fine.

Best regards,

Meet.

0 Meet Thakar 6 months ago in reply to Meet Thakar

TI__Mastermind 21515 points

On an additional note you can try removing the Bootloder_Profile prints if you are trying to optimize SBL execution time, as suggested here: https://software-dl.ti.com/processor-sdk-linux/esd/AM62PX/11_01_16_13/exports/docs/linux/How_to_Guides/Target/How_to_boot_quickly.html#secondary-boot-loader-sbl

I saw significant improvement in SBL time after removing these.

0 Fan Bomiao 6 months ago in reply to Meet Thakar

Prodigy 230 points

Hi Meet,

Really appreciate your investigation and advice. It helps a lot.

Regards,

Bomiao

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AM62P: AM62Px: Invalid boot time optimization measures from Linux SDK tutorial