Never mind 
. Not needed! For this router, U-Boot automatically adjusts (changes) the bootargs, based on boot_part. Works so sweet - dual boot running here. Need to capture in PR's now.
Thanks!
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FYI, PR submitted,
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Excellent news, thank you.
It will simplify future update. I also have a MR8300 on which I easily switch from one partition to the other. But no such way on the EA7300.
I can see that the kernel is 5.10 to 5.15. Is there a possibility that the change will be ported to future 22.03 RCs ? Or only on future master snapshots ?
Folks seemed to want this on master -> once in place, it can be asked about backporting to 22.03. But first, need to get it in master
Thanks!
Sounds logical. Thank you.
BTW, are you able to build your own image? If you do, you could pull my updates, run a build.
Yes of course, but I don't own the router. It's in a relative's home. I'm going there from time to time. So even if I build the image, I won't be able to test it within days.
NP, whenever you can - no panic. And remember, the first flash won't go the alternative partition 
Actually partition A has OpenWrt and partition B has Linksys firmware, with the tweak of erasing s_env partition at boot. What is the scheme with your update ? I assume that I must start by flashing a factory image from Linksys, but from partition A or B ?
You can do either one 
. Meaning,
- Flash from Linksys, using factory.bin => erases all settings of course, A will be OpenWrt.
- Flash from OpenWrt, A => A, and you can keep your settings.
The reason that 2 is A => A is because the files currently there flash to the same (active) partition. Once you install the upgrade the first time though (with the changes), then after that .. A => B, and B => A.
Clear as mud?
hm ... no 
I'm mailing you privately ...