I downloaded the source code，when I try to compile, I got this error:

  @ubuntu:~/rk356x_linux5.10$  ./build.sh kernel

  processing option: kernel

  ============Start building kernel============

  TARGET_ARCH     =arm64
  TARGET_KERNEL_CONFIG =rockchip_linux_defconfig
  TARGET_KERNEL_DTS  =rk3566-evb2-lp4x-v10-linux
  TARGET_KERNEL_CONFIG_FRAGMENT =

  ==========================================

  #
  # No change to .config
  #
    CALL    scripts/atomic/check-atomics.sh
    CALL    scripts/checksyscalls.sh
    CHK    include/generated/compile.h
    LZ4C    arch/arm64/boot/Image.lz4

  Incorrect parameters
  Usage :
        lz4 [arg] [input] [output]
  input   : a filename
        with no FILE, or when  FILE is - or stdin, read standard input
  Arguments :
   -1    : Fast compression (default)
   -9   : High compression
   -d    : decompression (default for .lz4 extension)
   -z    : force compression
   -f   : overwrite output without prompting
   -h/-H  : display help/long help and exit

  arch/arm64/boot/Makefile:31: recipe for target 'arch/arm64/boot/Image.lz4'  failed

  make[2]: *** [arch/arm64/boot/Image.lz4] Error 1
  make[2]: *** Deleting file 'arch/arm64/boot/Image.lz4'
  arch/arm64/Makefile:170: recipe for target 'Image.lz4' failed
  make[1]: *** [Image.lz4] Error 2
  make[1]: *** Waiting for unfinished jobs....
  arch/arm64/Makefile:214: recipe for target 'rk3566-evb2-lp4x-v10-linux.img'  failed
  make: *** [rk3566-evb2-lp4x-v10-linux.img] Error 2
  ERROR: Running build_kernel failed!
  ERROR: exit code 2 from line 663:
      make ARCH=$RK_ARCH $RK_KERNEL_DTS.img -j$RK_JOBS
    

Cause: The version of lz4 delivered with the compilation system is too early.
Solution: update to V1.8.3 or later.
lz4 -v            //check the compiler lz4 version
sudo cp out/host/linux-x86/bin/lz4 /usr/bin/lz   //copy lz4 from the Android source directory to override the compiler's