topeet RK3568 Linux5.10 Compilation

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Timeline

Timeline

2025-12-26

init

This article describes the process of compiling the topeet RK3568 platform Linux 5.10 kernel, U-Boot, and root filesystem using the aarch64-linux-gnu-gcc 15.1.0 compiler in a WSL Archlinux environment. It details the kernel compilation steps, the method for generating compile_command.json when viewing kernel source code with clangd, and source code modifications to address Clang errors on GCC inline assembly (such as reading the sp register). It also lists various defconfig configurations for RK3568 U-Boot and their applicable scenarios, and mentions the generated image file types. Additionally, the article covers root filesystem compilation and Recovery flashing, but some steps are marked as TODO (to be studied). Overall, it is a practical record for developers.

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Environment

OS

Using Archlinux on WSL

Environment

compiler

ARM has released 8 architectures in total: ARMv1, ARMv2, ARMv3, ARMv4, ARMv5, ARMv6, ARMv7, ARMv8.

For Cortex-A5x processors, you can useaarch64-linux-gnu-gcc -march=armv8-aCompile the code using the command. The ARM GNU compiler can be downloaded from the link below.

Arm GNU Toolchain Downloads

https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads

Using aarch64-linux-gnu-gcc version 15.1.0 downloaded via pacman on Archlinux.

aarch64-linux-gnu-gcc

source code

The source code is provided by topeet:

topeet RK3568 Linux5.10Source code

https://pan.baidu.com/s/1c9wUwvY0oe72--K-f5l8SA?pwd=ba5f

Compile the kernel.

Compilation

Use the aarch64-linux-gnu-gcc 15.1.0 compiler.

sudo pacman -Sy bc

make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- clean
make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- rockchip_linux_defconfig
make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- menuconfig

make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- modules_prepare

# -Wno-dangling-pointer disables GCC's "dangling pointer" warning.
# -Wno-enum-int-mismatch disables the "enum type and integer type mismatch" warning.
export KCFLAGS="-Wno-dangling-pointer -Wno-enum-int-mismatch"

make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- Image dtbs -j$(nproc)

unset KCFLAGS  # Optional, clear after use.

Viewing kernel source code with clangd

Generate compile_command.json

./scripts/clang-tools/gen_compile_commands.py

When using clangd as the language server, you need to add CompileFlags because clangd does not recognize some GCC compilation options:

CompileFlags:
  Add: -Wno-unknown-warning-option
  Remove: [-m*, -f*]

sp error

clangd reports an error:

clang [asm_invalid_global_var_reg]: Register 'sp' unsuitable for global register variables on this target

Bind the variable current_stack_pointer to the sp register (i.e., the current stack pointer) to directly read the stack top address. This syntax is legal when GCC compiles the Linux kernel (especially on ARM64), but Clang has stricter restrictions. Therefore we modifyarch/arm64/include/asm/stack_pointer.hThe source code is as follows. For__clang__use an inline assembly function to return the value of sp.

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_STACK_POINTER_H
#define __ASM_STACK_POINTER_H

/*
 * how to get the current stack pointer from C
 */
#ifdef __clang__
// For clang: fake it
static inline unsigned long get_sp(void)
{
	unsigned long sp;
	__asm__("" : "=r"(sp) : "r"(0));
	return sp;
}
#define current_stack_ptr get_sp()

#else
register unsigned long current_stack_pointer asm("sp");

#endif

#endif /* __ASM_STACK_POINTER_H */

Compile U-Boot

The defconfig for RK3568 is as follows.

defconfig	Support kernel dtb	Description
rk3568_defconfig	Y	Generic version
rk3568-dfu.config	Y	Support DFU
rk3568-nand.config	Y	Support MLC/TLC/eMMC
rk3568-spl-spi-nand_defconfig	Y	SPI-NAND dedicated SPL
rk3568-aarch32.config	Y	Support AArch32 mode
rk3568-usbplug.config	Y	Support usbplug mode

make rk3568_defconfig
export KCFLAGS="-Wno-enum-int-mismatch -Wno-maybe-uninitialized"
make CROSS_COMPILE=aarch64-linux-gnu- -j$(nproc) all
unset KCFLAGS  # Optional, clear after use.

Generate:

• u-boot（ELF）
• u-boot.bin(raw binary)
• spl/u-boot-spl.bin(if SPL is enabled)
• tpl/u-boot-tpl.bin(if TPL is enabled)
• u-boot.dtb(embedded external device tree)

tools/mkimage -n rk3568 -T rksd -d tpl/u-boot-tpl.bin idbloader.img

cat spl/u-boot-spl.bin >> idbloader.img

The loader generated this way may have some issues, still to be investigated TODO

Compile the root filesystem.

make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- rockchip_rk3568_defconfig
make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- menuconfig
sudo pacman -Sy cpio rsync

Compile recovery

TODO

Flash

TODO