ADI br2-external

This br2-external contains Buildroot configuration specific to ADI that cannot be mainlined. Generic support for ADI evaluation boards is implemented in the ADI Buildroot tree.

Getting Started

git clone --recurse-submodules https://github.com/analogdevicesinc/br2-external.git
cd br2-external/buildroot
make BR2_EXTERNAL="${PWD}/.." adi_sc598_ezkit_defconfig

Additional configuration is applied using Buildroot fragments:

support/kconfig/merge_config.sh .config \
    ../configs/buildroot.fragment \
    <ADI Configuration fragments>

Top-level Makefile

A small wrapper at the repo root mirrors the in-tree workflow without having to cd buildroot/ first:

make buildroot                   # clone & patch (skips if buildroot/ exists)
make zynq_pluto_defconfig        # forwarded to Buildroot
make -j$(nproc)                  # forwarded; BR2_EXTERNAL is set for you

Override the checkout source with BUILDROOT_URL / BUILDROOT_VERSION; the defaults point at the ADI Buildroot fork on adi-2026.02-y. make buildroot-patch re-applies any local patches and is idempotent — patches already present in the checkout are skipped via git apply --check.

Buildroot patches

patches/buildroot/ holds ADI-specific Buildroot changes (package fix-ups, kernel build glue, etc.). These are already merged into the ADI Buildroot fork the submodule points at, so they are normally no-ops at build time. They are kept here as an applicable set so the same image can be built against a stock upstream Buildroot checkout (via BUILDROOT_URL override) without manually carrying the patches.

ADI Configuration Fragments

• configs/buildroot.fragment
  • Configure Buildroot to speed up builds
• configs/debug.fragment
  • Enable debugging in U-Boot and the kernel
  • Build the kernel image with an embedded root filesystem to reduce complexity around writing and mounting a root filesystem from storage
• configs/bootstrap.fragment
  • Enable a minimal bootstrap / installer image.
  • Includes only the tools required to program boot media.

Example Builds

Debug Image

make BR2_EXTERNAL="${PWD}/.." adi_sc598_ezkit_defconfig
support/kconfig/merge_config.sh .config \
    ../configs/buildroot.fragment \
    ../configs/debug.fragment
make -j$(nproc)

Bootstrap Image

make BR2_EXTERNAL="${PWD}/.." adi_sc598_ezkit_defconfig
support/kconfig/merge_config.sh .config \
    ../configs/buildroot.fragment \
    ../configs/bootstrap.fragment
make -j$(nproc)