Linux/BEAGLEBK: Sync command not working

Amod Amatya

Part Number: BEAGLEBK

Tool/software: Linux

I am working on BBB adding new h/w configurations with device tree. I do not want everytime to build a new image and again flash it to test a new feature(a very long process indeed). So what I was doing was updating the dts file and then creating a new dtb file with the latest features and using ssh to transfer the new dtb file to the boot folder of BBB(in other words replacing the old dtb file of BBB with a new one).
After doing all this, I performed a sync operation followed by a reboot.
Shouldn't this start the BBB with added features? Am I doing it the right way?

over 6 years ago

0 Biser Gatchev-XID over 6 years ago

TI__Guru**** 393215 points

Please post which Linux version you are using.

0 Biser Gatchev-XID over 6 years ago in reply to Biser Gatchev-XID

TI__Guru**** 393215 points

Please note that if you are using the Debian release which comes with BBB, it's not supported by TI, and you should direct your questions to the community on www.beagleboard.org

0 Amod Amatya over 6 years ago in reply to Biser Gatchev-XID

Prodigy 170 points

Hy Biser,

I am using 4.18.25-yocto-standard

Kind Regards,
Amod

0 Kemal R. Shakir over 6 years ago in reply to Amod Amatya

TI__Guru 55345 points

Hello Amod,

The method you use is correct. Replacing only the device tree will be sufficient in cases where the interface you enable and its driver is embedded in the kernel or it is present in the rootfs as a module. Otherwise you will need to replace the kernel or add the new modules to rootfs and run depmod -a command to generate the modules.dep and map files.

I've enabled the UART4 as in this your previous thread on my BBB with the latest Processor SDK, and no mater I do sync or not the UART4 was enabled and working. It appears that the 4.18.25-yocto-standard version you are using is not okay. Please, try to reproduce this issue with the latest Processor SDK to be able to help you further.

Best regards,
Kemal

0 Amod Amatya over 6 years ago in reply to Kemal R. Shakir

Prodigy 170 points

Hy Kemal,

Thank you so much for your reply.
What I observed in my scenario is the sync and reboot worked absolutely fine if I just had to update some features in the dts file without configuring or changing the kernel module. But if I change anything in the kernel module, for instance I had to enable the IIO(Industrial I/O) through the "make menuconfig" command in the developer shell, for which I had to completely build a new image.

Kind Regards,
Amod

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Linux/BEAGLEBK: Sync command not working