TSN PTP timestamp on on LS1028ARDB switch

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TSN PTP timestamp on on LS1028ARDB switch

Contributor III

We are trying to enable TSN on the Layerscape LS1028ARDB development board. We are running the following commands from the LS1028A BSP User Guide, Rev. 0.3, 04/2019. Enable timestamp on switch
Follow the following commands to enable timestamp on switch:
#Init PTP:
devmem 0x1fc0900a0 w 0x00000004
#Get PTP real time(second):
devmem 0x1fc0900c4

When I run the first command to enable timestamping:

root@NXP-1:~# devmem 0x1fc0900a0 w 0x00000004

It results in the following error:

-bash: devmem: command not found

After finding this forum post, I installed devmem2 from us.ports.ubuntu.com and ran the following variation of the command, which uses devmem2 instead of devmem:

root@NXP-1:~# devmem2 0x1fc0900a0 w 0x00000004

This is successful:

/dev/mem opened.

Memory mapped at address 0xffffbd909000.

Value at address 0xFC0900A0 (0xffffbd909a0): 0x4

Written 0x4; readback 0x4

Then I run the next command from the User Guide, to see the PTP time:

root@NXP-1:~# devmem 0x1fc0900c4

This results in the following errror:

/dev/mem opened.

Memory mapped at address 0xffff8ea5d000.

Bus error


What does this error mean?

How do I see the PTP time?

Is PTP timestamping going to work in the switch?

Where do I find documentation on these addresses? 

When will there be corrected, tested, and verified version of the User Guide for the LS1028ARDB made available so I stop wasting so much time debugging the errors in the current  User Guide? 

Jeremy Impson

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NXP TechSupport
NXP TechSupport

After booting up LS1028ARDB, the following commands could be executed successfully.

root@localhost:/test_dir_new# devmem 0x1fc0900a0 w 0x00000004

root@localhost:/test_dir_new# devmem 0x1fc0900c4


You could use LSDK 19.09 release, init PTP is enabled in Linux Kernel by default.

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