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Now the combination of current u-boot and edge kernel works just fine: linux-image-edge-meson64-23.02.2 contains kernel 6.2.0-rc3-meson64, linux-u-boot-khadas-vim3-current-23.02.2 contains u-boot 2022.07. Concerning your recovery question, do you run from emmc, or SD card? SD card is easier, insert into another arm linux, do chroot and downgrade/upgrade uboot and kernel. If you run from emmc, you can flash a minimal system on SD card and insert it. SD card should is booted booted before emmc. Then you chroot and repair. Hope, it helps.

The new MGLRU v13 should fix the "BUG: kernel NULL pointer dereference, address:..." problem introduced in v11 and v12. https://lore.kernel.org/lkml/20220706220022.968789-1-yuzhao@google.com/

It seems that the kernel is not a problem. Now running linux-image-edge-meson64 and linux-dtb-edge-meson64. That is the kernel 5.15.18. The problem is the u-boot. I have to use linux-u-boot-khadas-vim3-current as linux-u-boot-khadas-vim3-edge does not work. Thanks for the cpufrequtils. It seems you can only set one frequency for both little and big cores. Setting the big cores to the default 2.2 GHz overclocks the little cores to 2.0GHz from default 1.8GHz. But it seems to work OK.

I was trying Jammy (autobuild) with kerenl 5.15.18 on Khadas Vim3 4GB RAM, but is does not start, no HDMI output, no LED activity. Then I tried Hirsute with kerenl 5.13 and that boots fine, but after update new kernel (5.15) and also u-boot is installed and then it does not start again. My solution for now is to boot Hirsute with 5.13 and replace all edge packages with current (linux-dtb-current-meson64, linux-image-current-meson64, and linux-u-boot-khadas-vim3-current). This downgrades the kernel to 5.10.81, but the board can be updated and boots fine.