... fi; if run loadimage; then if env exists root; then echo root has been defined by user; else part uuid ${devtype} ${bootpart} uuid; setenv root PARTUUID=${uuid}; fi; run mainargs; if run loadfdt; then if run loadrd; then bootz ${loadaddr} ${rdaddr}:${filesize} ${fdtaddr}; else bootz ${loadaddr} ...

Yeah, I recognized that UUID and PARTUUID differs, this was the mistake. I decided to repartition my device and delete the boot partition, because I don't need it anymore.
Everything is running fine now next step is DT-Kernel to use the new marvell_cesa

... Using fstab solves the problem that the USB drive could appear as different devices on different boots. Instead he can reference the UUID or PARTUUID in fstab to set /. I should have realized this as the armlinuxarm tar file comes with an fstab containing /dev/mmcblk0p1 /boot vfat defaults ...

... 16GB, Part3 79GB (only 111GB available after format). I can have different root dirs in Part1 and Part2 and change which I boot by changing root=PARTUUID=<partition id> of bootargs in boot.txt. Better performance too. hdparm -t give 350 MB/s for buffered disk reads. ETA: Just read the linked ...

... then fall back to /. I boot my n2 from an sd card which only has /boot contents in its first partition / and the boot.ini therein sets root=PARTUUID= to a partition on a USB attached SSD. fstab mounts the boot partition onto /boot. So with mountpoint -d / the device is set to /dev/sda1 rather ...

... it for an arch boot dir, copied my /boot contents from my N2, adjusted boot.ini for the n2-plus dtb, adjusted fstab on my root dir for the boot PARTUUID of this SD so it can be mounted, and I was up and running on the N2+ with all that was running on my N2. My main reason for switching is that ...

... the first try always fails and the second try always succeeds. I have my /boot on a microSD card but root in on a USB 3.0 attached SSD. I use PARTUUID for root= in boot.ini dir but in fstab to mount /boot I use /dev/mmcblk0p1. I don't have experience with petitboot so cannot help there.

... bcm2708_fb.fbheight=984 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 console=ttyS0,115200 console=tty1 root=PARTUUID=7fcf33aa-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait Build Date: 15 January 2021 02:03:57PM xorg-server 2:1.20.4-1+rpt2+deb10u3 ...

... MDT 2017 aarch64 [ 1043.762] Kernel command line: cros_secure console=tty1 console=ttyS2,115200n8 earlyprintk=ttyS2,115200n8 init=/sbin/init root=PARTUUID=bfe258cc-5253-ac43-ace8-0ff7c779c9d3/PARTNROFF=1 rootwait rw noinitrd [ 1043.762] Build Date: 10 April 2017 01:12:17AM [ 1043.762] [ 1043.762] ...

... LABEL="boot" UUID="C3D8-FB42" BLOCK_SIZE="512" TYPE="vfat" PARTLABEL="boot" PARTUUID="2913d6d4-d377-49c4-8d7f-734c6c49d6cf" /dev/mmcblk1p2: LABEL="rootfs" UUID="29a94882-5add-4f09-8cc5-3f43918624fa" ...