Tutorial: Run Debian off NVMe

[hive]

That is parameters that are set before  uboot is compiled
strings u-boot.img  OR uboot,img will show about 4-5 pages of things inside uboot
Usually, not all that useful
the grep is for boot_targets, which is uboot search order
To change, you will have to compile uboot yourself
(BTW,, mmc1=SD,,,mmc0=emmc)
I have been looking, maybe there is a trick to "chain" extlinux.conf's, so far no
Other than renaming,, ie extlinux.conf ->extlinux.conf.bak,, that works (or rather, doesn't, ie won't find this one)
Just what are you trying to do?  Get a selector? 
If so, the only one, so far, is samueldr's uboot, needs a patched kernel (until 5.9, patch will be mainline)
It does sort of work, 2-6 boot attempts needed, so can take a few minutes (this with unpatched kernel)

@wdt ok, I understand.  I was looking for a way to change the order without having to re-build and re-install uboot.