Fixing FreeBSD 14 Boot Issue on RPi4
Contents
After updating my FreeBSD installation to 14.x on my old Raspberry Pi 4 the system stopped booting. The problem is that the system cannot find the root filesystem anymore. It seems this is a particular issue with some older revisions of the Raspberry Pi 4 (especially those with 4GB+ RAM, like those ending in “B0T”) leading to MMC timeouts and failure to mount the root filesystem.
Fix
If you have an RPi 4 model with 4GB+ RAM, a common workaround is to edit the config.txt file in the EFI partition of your SD card. Add the following line under the [pi4] section:
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