Samsung Boards

Samsung Boards

The Samsung directory captures REG Linux support for the Exynos5422 SoC as used on the ODROID‑XU4.

Supported devices

• odroidxu4 (Exynos5422)

Layout highlights

• Kernel configuration: linux-exynos5422-defconfig.config exports the ARM kernel config (LZ4 compression, REGLINUX hostname, preemption enabled) that enables the vendor subsystems REG Linux relies on.
• Kernel patches: linux_patches/ contains numbered fixes for hardware quirks, HID tweaks, voltage/temperature handling, DRM/V4L2 updates, and IOMMU/PM domains needed for ODROID stability.
• Boot image: odroidxu4/create-boot-script.sh copies zImage, DTBs, initramfs, modules, firmware, rescue data, and U-Boot binaries into the boot tree. odroidxu4/genimage.cfg assembles reglinux.img with HardKernel BL1/BL2/TZ/U-Boot blobs plus FAT32 boot and userdata partitions. boot/extlinux.conf supplies the kernel command line (console=ttySAC2,115200, initrd=initrd.lz4, etc.).
• Filesystem overlay: odroidxu4/fsoverlay/etc installs asound.conf to fix ALSA routing and init.d/S02fan to actuate PWM fan speeds from the thermal sensors.
• Software patches: odroidxu4/patches/ tweaks Sugarbox and SwitchRes for ODROID, while patches/uboot/ adds the board’s defconfig and string adjustments to U-Boot.

Integration tips

1. Apply the kernel patches before building Linux and package the exported config so the REG Linux tree matches the live image.
2. Build U-Boot with the HardKernel odroid-xu4_defconfig (or use provided binaries) to enable the board’s firmware layout.
3. Run create-boot-script.sh after the build to stage artifacts, then feed genimage the odroidxu4/genimage.cfg to regenerate reglinux.img.
4. Update the overlay, bootloader, or patch documentation whenever overlays, cmdlines, or bootloader blobs change so future contributors follow the same workflow.