Page 1 of 1

CM3 Plus Minimum Linux Kernel version requirement

Posted: Mon May 13, 2019 8:22 am
by leelabks
We have some old development which used for the CM3 and would like to migrate directly to the new CM3 Plus. May I know what the minimum Linux kernel version in order to support this new CM3 Plus? If I am using Linux kernel v4.4.50, can I do a kernel upgrade directly in order to make them work in the new CM3 Plus?

Re: CM3 Plus Minimum Linux Kernel version requirement

Posted: Mon May 13, 2019 10:02 am
by 6by9
The Linux kernel will probably not care about the difference between a CM3 and CM3+ if you already had a CM3 working on 4.4.

You are likely to need to upgrade the firmware files (start*.elf and fixup*.dat in /boot) so that they understand how to handle the updated board version string.

Re: CM3 Plus Minimum Linux Kernel version requirement

Posted: Mon May 13, 2019 12:26 pm
by leelabks
Thank you for your reply, may i know where to get the appropriate firmware files (start*.elf and fixup*.dat in /boot) for the CM3 Plus? is it just copy out the latest firmware image "start.elf", "start_cd.elf", "start_db.elf", "start_x.elf", "fixup.dat", "fixup_cd.dat", "fixup_db.dat", and "fixup_x.dat"? please let me know if i missed out any of the files, thank you very much.

Re: CM3 Plus Minimum Linux Kernel version requirement

Posted: Mon May 13, 2019 12:50 pm
by jamesh
leelabks wrote:
Mon May 13, 2019 12:26 pm
Thank you for your reply, may i know where to get the appropriate firmware files (start*.elf and fixup*.dat in /boot) for the CM3 Plus? is it just copy out the latest firmware image "start.elf", "start_cd.elf", "start_db.elf", "start_x.elf", "fixup.dat", "fixup_cd.dat", "fixup_db.dat", and "fixup_x.dat"? please let me know if i missed out any of the files, thank you very much.
Yes, grab those from the most recent Raspbian release.

Re: CM3 Plus Minimum Linux Kernel version requirement

Posted: Mon May 13, 2019 1:01 pm
by aroman_ro
I think you can get them also from here:

https://github.com/raspberrypi/firmware

You might want the 'stable' branch?

Re: CM3 Plus Minimum Linux Kernel version requirement

Posted: Tue May 14, 2019 2:28 am
by leelabks
after i use the latest firmware image start*.elf and fixup*.dat in /boot to replace my firmware image above file, my firmware image can boot up now. Thank you everyone!