Manjaro ARM 19.12 Official Release - PineBook Pro

[spikerguy]

No the above fix is only for upgrading from old releases as we are now using dual partition method for all the devices. 

To fix booting from other OS over sd is a fix needed to be implemented by the other OS maintainers.

So if I understand, you do not need to do the fix if you are installing Manjaro to eMMC when the eMMC has an OS other than Manjaro (eg. stock Debian), and the fix is only necessary if installing over an older Manjaro?

Then is there a way to boot current other OS from SD?

I mean if you plan to flash Manjaro to eMMC and want to run other OS over SD card then some will work out of the box while some might not.

Here is the list of the OS which have worked and which have some issue. Strit have also documented the workaround as a fix.
OS Tested on SD Card