openwrt/docs/cross_compilation_notes.md

Cross-Compilation Notes

GL-iNet Flint 2 (GL-MT6000)

• SoC: MediaTek MT7986 (Filogic 830)
• CPU: Quad-core ARM Cortex-A53 @ 2.0GHz
• Architecture: aarch64
• Target: mediatek/filogic
• SDK Path: ../openwrt-sdk-mediatek-filogic_gcc-14.3.0_musl.Linux-x86_64
• Toolchain: gcc-14.3.0_musl

Compiling for Flint 2

1. Source the SDK environment (if using the full SDK wrapper) or add the staging_dir toolchain to PATH.
2. Export STAGING_DIR:

   export STAGING_DIR=/home/sapient/Projects/OpenWRT/openwrt-sdk-mediatek-filogic_gcc-14.3.0_musl.Linux-x86_64/staging_dir
   

3. Add toolchain bin to PATH:

   export PATH=$PATH:$STAGING_DIR/toolchain-aarch64_cortex-a53_gcc-14.3.0_musl/bin
   

4. Compile with aarch64-openwrt-linux-gcc.

GL-iNet Flint 1 (GL-AX1800)

• SoC: Qualcomm IPQ6000
• CPU: Quad-core ARM Cortex-A53 @ 1.2GHz
• Architecture: aarch64
• Target: ipq807x/generic or ipq807x/ipq60xx (check OpenWRT target mapping)

Compiling for Flint 1

• Similar to Flint 2, this is an aarch64 architecture.
• CAUTION: while the architecture is the same (aarch64), kernel headers and libc versions might differ if using a different OpenWRT version.
• Ideally, obtain the SDK for ipq807x if the application relies on kernel interfaces or specific libraries. for generic userspace apps, the Flint 2 toolchain might work but is not guaranteed.

General Notes

• Both devices are aarch64.
• Generic static binaries compiled for aarch64-linux-musl should likely work on both.