this I cannot remember I have experienced on my ROCK5B, it was indeed boot-loop when power 'was not good enough'; with fixed 12V power everything worked, even 3.5mm audio I remember. Now I have EDK2 UEFIv1.1 for the ROCK5B in the SPI-flash and it is like a PC, so even stores boot entries for several OSses (what is on the ESP). My ROCK3A showed similar behavior as your ROCK5B, that went away when fixed 12V power and Armbian legacy U-Boot and 6.1.115 (I use SATA overlay) At sector 64 the binary u-boot.bin is written, the terminology I am not sure of. You can look up all addresses the ROM uses at rock-chip.com or so. You might want to build/compile an as pure as possible and as latest as possible mainline U-Boot for ROCK5B, I saw kernel 6.17 or later should have fusb302 support, but it might be too late in the power-on process. EDK2 UEFIv1.1 has no fusb302 support.

Sorry I forgot to mention, I have used dts from Armbian-unofficial_25.05.0-trunk_Transpeed-8k618-t_bookworm_edge_6.12.11_server.img.xz version to make the 2nd USB working.

Thanks for replying. I have tried the images that you have suggested. Below given is the status. Armbian-unofficial_25.05.0-trunk_X96q-lpddr3-v1-3_bookworm_edge_6.12.11_server.img.xz - Not booting Armbian-unofficial_25.05.0-trunk_X96q-ddr3_bookworm_edge_6.12.11_server.img.xz - Not Booting Armbian-unofficial_25.05.0-trunk_X96q-ddr3-v5-1_bookworm_edge_6.12.11_server.img.xz - Boots but hangs at Btrfs step in the beginning itself Armbian-unofficial_25.05.0-trunk_Vontar-h618_bookworm_edge_6.12.11_server.img.xz - Boots but hangs at Btrfs step in the beginning itself Meanwhile I have tried to edit the dts file and modified the usb related entries from "disabled" to "okay" which made the 2nd USB working. Since the Ethernet is working fine the WiFI is less priority as of now. However if I can make the VFD working will help me to understand whether the device is up and running or powered off. At present the VFD is black so unable to check the status. Also it will be good to display the current time if possible.

Yeah no problem, heading to GitHub. No forum for Ubuntu and you are not covering the 5b so I tried. They will care about solid performance. defcom5

> My ROCK5B was ordered as a 'blue one' on Aliexpress a year ago Mine has green PCB with some text: Rock 5B v1.42022.08.29 U-boot at sector 64 is SPL or standard U-boot? From what I've read online it looks like if it was a power supply issue I would get a boot loop but my board never reset... It looks like U-boot has support for fusb302. I will build a U-boot with more logs to see if there is any negotiation going on. I've built a Nixos Image. I'm able to go up to U-boot console, start linux via extconfig then get some Linux logs but at some point it just stops without errors on some random log.