Br23uboot100 Better

The build begins within the Buildroot environment. The br23 configuration specifies the cross-compilation toolchain (such as gcc-arm-linux-gnueabihf ), targeting the architecture defined under the 100 profile. Buildroot pulls the exact source tree required for the bootloader. 2. The U-Boot Build Phase

“However – I flashed the uboot100, but then the router would not boot. Uboot threw continuous 'bad header' messages, rebooted itself, and could not be interrupted.” br23uboot100

The most technical interpretation is that is a custom firmware image. The build begins within the Buildroot environment