• DmitrySalychev
• BeagleBoneBlack

Netboot (TFTP, NFS root)

It happens that .dts/.dtb for BeagleBone Black in CURRENT might break the boot process (one, two and three). In order to fix it and boot BBB with a known-good .dtb FreeBSD loader(8) can be supplied with the given configuration:

        # Load kernel, modules, dtb/dtbo _before_ loader's console
        beastie_disable="YES"
        loader_color="NO"

        # Load .dtb/.dtbo
        dtbfile_load="YES"
        dtbfile_type="dtb"
        dtbfile_name="am335x-boneblack.dtb"
        #fdt_overlays="am335x-boneblack-pruss.dtbo"

It means that /boot/dtb/am335x-boneblack.dtb should exist on NFS root. At the same time it's enough to load /boot/loader.efi via TFTP. From u-boot console:

        => dhcp
        => tftp ${kernel_addr_r} loader.efi
        => bootefi ${kernel_addr_r}

Make sure that FreeBSD kernel, dtb (and modules, perhaps) loaded and boot. From loader(8) console:

        => lsmod
        kernel ...      
        am335x-boneblack.dtb ...
        ... modules ...
        => boot