Tegra (Tegra2, ...) ARM architecture

Video support

Rockchip ARM architecture

"Das U-Boot" Source Tree

Driver Model

STMicroelectronics ARM architecture

Microblaze architecture

A rewrite of hs's tbot in python3 (now hosted at https://github.com/Rahix/tbot)

U-Boot port for Synopsys DesignWare ARC cores

Amlogic (Meson) ARM architecture

Atmel/Microchip (AT91) ARM architecture. This is the custodian tree for the AT91 architecture, which includes support for latest Cortex-A5 and ARM926 boards, which feature the SoCs: sam9x5, sam9x60, sama5d4, sama5d3, sama5d2. http://www.linux4sam.org

x86 architecture

UEFI sub-system

Altera SoCFPGA ARM architecture

SH architecture

Freescale QorIQ Systems

USB drivers

Sunxi (Allwinner) ARM architecture

MIPS architecture