Thank you for prompt and robust answer. I used old formating tool as you suggested hence the problem with PARTUUID.

I am very impressed and grateful how quickly I managed to find a help and guidance to solve the problem and also learnt so much in the process. Thank you!

The root parameter for uboot in these devices is set in /boot/uEnv.txt, mine is: root=PARTUUID=94a2dc27-01 mtdparts=mtdparts=orion_nand:0xC0000(uboot),0x40000(uboot_env),0x80000(old_uboot_env),0x80000(key_store),0x80000(info),0xA00000(etc),0xA00000(kernel_1),0x2FC0000(rootfs1),0xA00000(kernel_2),0x2FC0000(rootfs2) ...

... to investigate further. The preceding (what I would think are relevant) messages are as follows: Waiting 10 seconds for device /dev/disk/by-partuuid/(the UUID of the device, referenced below as #PARTUUID, which I verified with blkid) ERROR: device 'PARTUUID=#PARTUUID' not found. Skipping ...

... 65 ms (9.8 KiB/s) Running bootscript from mmc ... ## Executing script at 70800000 baudrate=115200 boot_fdt=try bootargs=console=ttyGS0,115200 root=PARTUUID=e05cb4d1-01 rw rootwait video=mxcdi1fb:RGB24,VGA-SXGA vga di1_primy bootcmd=mmc dev ${mmcdev}; if mmc rescan; then if run loadbootscript; then ...

... + #define CONFIG_CMD_SATA #ifdef CONFIG_CMD_SATA #define CONFIG_DWC_AHSATA The boot.txt I've used is: setenv bootargs console=ttyGS0,115200 root=PARTUUID=${uuid} rw rootwait video=mxcdi1fb:RGB24,VGA-SXGA vga di1_primary #printenv if run loadimage; then run mmcboot; fi Best Regards Claudio

... size: 0x1000 Flags : 0x0 Body verification succeeded. Config: console=ttyS2,115200n8 earlyprintk=ttyS2,115200n8 console=tty1 init=/sbin/init root=PARTUUID=%U/PARTNROFF=1 rootwait rw noinitrd In /var/log/debug_vboot_noisy.log: Examining kernels... # copying /dev/mmcblk1p1 to kern_0... + dd if=/dev/mmcblk1p1 ...

... dtparam=pwr_led_trigger=none dtparam=pwr_led_activelow=off dtparam=eth_led0=4 dtparam=eth_led1=4 [costel@pi ~]$ cat /boot/cmdline.txt root=PARTUUID=06c71f75-02 rw rootwait console=ttyAMA0,115200 console=tty1 selinux=0 plymouth.enable=0 smsc95xx.turbo_mode=N dwc_otg.lpm_enable=0 kgdboc=ttyAMA0,115200 ...

... screen works properly. Possibly relevant dmesg: user@host ~ % dmesg | grep hdmi [ 0.000000] Kernel command line: quiet console=ttymxc0,115200 root=PARTUUID=fc9d0509-c8e4-427f-abcc-2f54a732fc0d rootwait rw console=ttymxc0,115200 console=tty1 consoleblank=0 video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24,bpp=16 ...

... the internal arduino chip is not seen anymore. dmesg also only lists mxc1: [code ][ 0.000000] Kernel command line: console=ttymxc1,115200 root=PARTUUID=1a2074b4-01 rw rootwait video= [ 0.000032] clocksource: mxc_timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 637086815595 ns [ ...

... uuid and mouting partitions by uuid. And starting from there I made it work by changing the root kernel parameter from root=/dev/mmcblk1p2 to root=PARTUUID=8477a483-02 For some reason o couldn make it boot with root=LABEL=... or root=UUID=... Also, I had to modiy fstab too to mount boot partition ...