There are 5 repositories under u-boot topic.
U-Boot 1.1.4 modification for routers
OpenWrt firmware installer for the Linksys E8450 aka. Belkin RT3200
Generate filelist and slickedit for the compiled source file and depend header file for Linux Kernel and U-boot
A U-Boot hacking toolkit for security researchers and tinkerers
AXIOM firmware (linux image, gateware and software tools)
FPGA+SoC+Linux+Device Tree Overlay+FPGA Manager U-Boot&Linux Kernel&Debian11 Images (for Xilinx:Zynq-Zybo:PYNQ-Z1 Altera:de0-nano-soc:de10-nano)
Spotify Car Thing (superbird) resources to access U-Boot shell over USB
Scripts to build bootable SD card images with Debian for various single-board computers
FPGA+SoC+Linux+Device Tree Overlay+FPGA Manager U-Boot&Linux Kernel&Debian11 Images (for Xilinx:Zynq Ultrascale+ MPSoC)
BananaPi M2 Zero - Ubuntu Focal Base Minimal Image (Experimental) - U-Boot 2017.09 / Kernel 4.18.y / Kernel 4.19.y / Kernel 4.20.y / Kernel 5.3.y / Kernel 5.6.y / Kernel 5.7.y / Kernel 5.11.y
Technical data (reverse engineered) and an alternative firmware (Debian GNU/Linux) for the Seagate Blackarmor NAS
Debian + Mainline Linux Kernel + u-boot. Bootstrap Script and Tutorial for RPi2/3.
Pine64 U-Boot with patches to compile and boot fixed BSP Kernel in a sensible way
Firmware Image Package (FIP) sources to sign Amlogic u-boot binaries in LibreELEC, Armbian and meta-meson
Open Mesh OM5P-AC v2 Unlocker (U-Boot 1.1.4 based)
EasyArm i.MX280a, u-boot-2020.07, linux-5.5.5
debian arm64 linux for the nanopi r4s
Building U-Boot, Linux kernel, and Rootfs from scratch for the embedded system (raspberry-pi)
A script that may come in handy when building U-Boot images for Pinebook Pro
OpenWrt with support for the Xiaomi Mi WiFi Router 3 a/k/a MIR3. Based on current stable release v18.06.2 with Linux Kernel 4.14.95.
A complete project that can run Linux-3.12.74 on a microcontroller, and the hardware development environment is easily accessible.
A detailed guide for building and booting a 64-bit kernel on raspberry pi 3 b+ using u-boot.