Neptune,
The general idea is that you should try booting with Arch or Debian stick, and capture the entire boot log as it shown in serial console. And while in serial console prompt, printenv to get the settings of all u-boot envs. Perhaps the error is something easy to fix.
Only if you can't boot back into either Arch or Debian, then perhaps think about installing new U-boot from the rescue system.
Btw, the pastebin log file seems to be incompleted.
The general idea is that you should try booting with Arch or Debian stick, and capture the entire boot log as it shown in serial console. And while in serial console prompt, printenv to get the settings of all u-boot envs. Perhaps the error is something easy to fix.
Only if you can't boot back into either Arch or Debian, then perhaps think about installing new U-boot from the rescue system.
Btw, the pastebin log file seems to be incompleted.