A boot loader for Raspberry PI systems

 Das U-Boot is a cross-platform bootloader for embedded systems,
 used as the default boot loader by several board vendors. It is
 intended to be easy to port and to debug, and runs on many
 supported architectures, including PPC, ARM, MIPS, x86, m68k,
 NIOS, and Microblaze.
 .
 This package includes boot loaders for various Raspberry PI
 platforms.
 .
 Included platforms:
 rpi_3
 rpi_4
 rpi_arm64