This lecture describe the boot process of FreeBSD on ARM and the ongoing effort to upstream our local patches for U-Boot (An opensource bootloader for embedded devices) and DTS (DeviceTree Source) into the Linux Kernel. Booting FreeBSD on an ARM board relies on three things : U-Boot (An opensource bootloader for embedded devices) ubldr (a version of loader (8) using the U-Boot API) DTB (Devicetree Blob, a file that describe the hardware that we are running on). You, of course, also need drivers for the board System On a Chip but this is beyond this talk. Therefore it is important to keep up with U-Boot release as adding support for a new board will require support for it in U-Boot. It is also important to keep up with the DTS (Devicetree Syntax, the file that will be converted in a DTB) that we import from the Linux Kernel project as new board means new DTS file for it.