qcom-kernel-qcom-next-build

name	qcom-kernel-qcom-next-build
description	Cross-build the qualcomm-linux kernel (qcom-next branch) standalone on an x86 host: arm64 defconfig with the prune.config + qcom.config fragment merge used by meta-qcom's linux-qcom-next recipe, producing Image, DTBs and modules. Use when asked to "build the qcom-next kernel", "compile the Qualcomm kernel", "build a kernel with my patch for a qcom board", or "enable a kernel config for qcom". Do NOT use for building complete images (see qcom-yocto-build-image) or for bumping the kernel SRCREV in meta-qcom recipes.
metadata	{"version":"0.1"}

Build the qcom-next kernel standalone

Builds the qualcomm-linux kernel qcom-next branch from the command line, using the exact configuration recipe meta-qcom's linux-qcom-next uses — so a standalone developer build matches what the Yocto image ships.

Prerequisites

• An aarch64 cross toolchain, e.g. gcc-aarch64-linux-gnu (or clang with LLVM=1).
• Usual kernel build deps: flex, bison, libssl-dev, libelf-dev, bc.

1. Get the source

git clone -b qcom-next https://github.com/qualcomm-linux/kernel.git
cd kernel

Notes on the tree:

• qcom-next is an integration branch, regularly rebuilt on top of mainline -rc tags from merged topic branches (see the qcom-next/ bookkeeping directory with merge.log). Do not base long-lived work directly on it without expecting rebases; check with the maintainers' workflow for where to send patches.
• meta-qcom pins a tagged snapshot (qcom-next-<ver>-<date> tags) via SRCREV in linux-qcom-next_git.bb — build that tag instead of the branch tip when reproducing an image kernel exactly.

2. Configure — defconfig + qcom fragments

Mirror the fragment merge from meta-qcom's recipe: defconfig, minus the generic bloat that prune.config removes, plus the Qualcomm enablement in qcom.config:

export ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu-
make defconfig
./scripts/kconfig/merge_config.sh -m -O . .config \
    arch/arm64/configs/prune.config \
    arch/arm64/configs/qcom.config
make olddefconfig

Optional additions, matching the recipe's variants:

• Debug build: append kernel/configs/debug.config and arch/arm64/configs/qcom_debug.config to the merge list.
• PREEMPT_RT: append arch/arm64/configs/rt.config.
• Own changes: put them in a small fragment file and append it to the merge list rather than hand-editing .config; that keeps the change reviewable and re-appliable.

After merging, verify nothing you asked for was dropped: grep CONFIG_<OPTION> .config (merge_config warns on conflicts — treat those warnings as errors).

3. Build

make -j"$(nproc)" Image dtbs modules

Artifacts:

• Kernel: arch/arm64/boot/Image
• Device trees: arch/arm64/boot/dts/qcom/<board>.dtb (e.g. qcs6490-rb3gen2.dtb, qcs9100-ride-r3.dtb)
• Modules: make INSTALL_MOD_PATH=<staging dir> modules_install

4. Getting it onto a board

Two supported routes:

• Through meta-qcom (recommended — produces a flashable image): build with ci/linux-qcom-next.yml and point the recipe at your tree/SRCREV, or use the linux-qcom-next-upstream devupstream variant which builds the tip of qcom-next. Then flash with qcom-flash-qdl and check with qcom-boot-validate.
• Manual swap of Image/DTB into an existing boot flow — board- and boot-flow-specific; confirm the target's boot chain (ABL/U-Boot/UEFI) before attempting.

Notes

• 32-bit ARM machines (qcom-armv7a) use qcom_defconfig directly, with no fragment merge.
• make dtbs W=1 and make dt_binding_check are worth running when the change touches device trees or bindings — qcom-next follows upstream kernel review standards.
• Kernel patches ultimately flow through the upstream linux-arm-msm process; qcom-next is an integration tree, not a fork to target with GitHub PRs — check the repo's contribution documentation first.