Difference between revisions of "Linux kernel on Orange Pi 4"

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'''Prerequisite:''' [[U-Boot on Orange Pi 4]]
 
'''Prerequisite:''' [[U-Boot on Orange Pi 4]]
  
−
'''Next steps:''' [[rootfs on Orange Pi 4]]
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'''Next steps:''' [[Linux rootfs on Orange Pi 4]]
  
 
{{Todo|THIS!}}
 
{{Todo|THIS!}}
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=== Kernel patches ===
 
=== Kernel patches ===
 
{{Todo|Switch to a [[Mainline Linux]]. Right now we're using a [[BSP Linux kernel]] which already supports [[Orange Pi 4]].}}
 
{{Todo|Switch to a [[Mainline Linux]]. Right now we're using a [[BSP Linux kernel]] which already supports [[Orange Pi 4]].}}
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 +
{{Todo|...orangepi-4.dtb was not added to the ...arch/arm64/boot/dts/rockchip/Makefile}}
  
 
=== Cross-compilation ===
 
=== Cross-compilation ===
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<pre>CORES=4 # number of CPU cores
 
<pre>CORES=4 # number of CPU cores
 
make ARCH=arm64 CROSS_COMPILE=$CROSS_COMPILE -j${CORES} rk3399-orangepi.img</pre>
 
make ARCH=arm64 CROSS_COMPILE=$CROSS_COMPILE -j${CORES} rk3399-orangepi.img</pre>
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 +
To compile DTBs, most notably {{code|rk3399-orangepi-4.dtb}}:
 +
{{code-block|1=
 +
make ARCH=arm64 CROSS_COMPILE=$CROSS_COMPILE dtbs
 +
}}
  
 
You should see something like this at the end of the compilation:
 
You should see something like this at the end of the compilation:
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== Flashing ==
 
== Flashing ==
 
{{Todo|Building an SD Card image file would be better}}
 
{{Todo|Building an SD Card image file would be better}}
 +
{{Todo|Don't flash the kernel. Ignore this for now}}
 
<pre>dd if=boot.img of=sdb seek=32768</pre>
 
<pre>dd if=boot.img of=sdb seek=32768</pre>
  

Latest revision as of 00:03, 29 March 2020

Using Linux kernel on an Orange Pi 4.

This page is focused just on building a kernel. For the related required components, see Linux on Orange Pi 4.

Prerequisite: U-Boot on Orange Pi 4

Next steps: Linux rootfs on Orange Pi 4

TODO: THIS!

Overview

In order to build a Linux kernel you'll need:

  1. Linux kernel source
  2. (optional) Patches to add support for the specific hardware
  3. Cross-compilation toolchain if building on a different device than Orange Pi 4

Setup

Linux kernel

TODO: Git clone

Kernel patches

TODO: Switch to a Mainline Linux. Right now we're using a BSP Linux kernel which already supports Orange Pi 4.

TODO: ...orangepi-4.dtb was not added to the ...arch/arm64/boot/dts/rockchip/Makefile

Cross-compilation

This is needed only if you're building on a different architecture, e.g. on an x86_64 computer.

TODO: Linaro + instructions? 

CROSS_COMPILE=/path/to/toolchain/bin/aarch64-linux-gnu-

Compiling

TODO: compilation

Generate .config file 

cd linux
make ARCH=arm64 CROSS_COMPILE=$CROSS_COMPILE rk3399_linux_defconfig

Compile the kernel 

CORES=4 # number of CPU cores
make ARCH=arm64 CROSS_COMPILE=$CROSS_COMPILE -j${CORES} rk3399-orangepi.img

To compile DTBs, most notably rk3399-orangepi-4.dtb: make ARCH=arm64 CROSS_COMPILE=$CROSS_COMPILE dtbs

You should see something like this at the end of the compilation: 

Pack to resource.img successed!
  Image:  resource.img (with rk3399-orangepi.dtb logo.bmp logo_kernel.bmp) is ready
  Image:  boot.img (with Image resource.img) is ready
  Image:  zboot.img (with Image.lz4 resource.img) is ready

TODO: Customize boot logo.

TODO: Modules? Img to flash? boot.img

Flashing

TODO: Building an SD Card image file would be better TODO: Don't flash the kernel. Ignore this for now 

dd if=boot.img of=sdb seek=32768

Related

External Links

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