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

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{{Todo|THIS PAGE}}
 
{{Todo|THIS PAGE}}
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== Base rootfs selection ==
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There are various base root filesystem packages maintained by different [[Linux distribution|Linux distributions]], e.g. Debian, Arch Linux.
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We'll be using [https://archlinuxarm.org/ Arch Linux ARM].
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 +
{{Code-block|1=
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wget http://os.archlinuxarm.org/os/ArchLinuxARM-aarch64-latest.tar.gz
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}}
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== Partitioning ==
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[[U-Boot]] supports booting from ext2/3/4 partitions. Thanks to this all we have to do is create a single ext2/3/4 partition on a storage device and put all the data onto this partition.
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{{Todo|Create a single ext2/3/4 partition on an SD card / USB flash drive}}
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{{Todo|Format the partition}}
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== Populating rootfs ==
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{{Todo|Mount the storage to /mnt/disk}}
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 +
Run as root:
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{{code-block|1=
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bsdtar -xpf ArchLinuxARM-aarch64-latest.tar.gz -C /mnt/disk
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}}
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== Preparing /boot ==
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See [[U-Boot]] for details on how first bootloaders prime the device and how it looks for a followup bootloader. We make use of a standardized [[syslinux]] (extlinux) bootloader configuration. Alternatively we could configure a U-Boot specific boot script or create a combined kernel + DTB {{code|boot.img}} image.
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=== /boot/extlinux/extlinux.conf ===
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<pre>
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label rockchip-kernel-4.4
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    kernel /boot/Image
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    fdt /boot/dt.dtb
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    append earlycon=uart8250,mmio32,0xff1a0000 root=PARTUUID=B921B045-1D rootwait rootfstype=ext4 init=/sbin/init
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</pre>
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This part enables {{code|dmesg}} printing to debug console right from the start: {{code|earlycon=uart8250,mmio32,0xff1a0000}}
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To find out PARTUUID, try {{code|ls /dev/disk/by-partuuid/* -all}}.
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=== /boot/Image ===
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{{Todo|Copy the compiled kernel Image file to /boot/Image}}
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=== /boot/dt.dtb ===
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{{Todo|Copy the compiled device tree ??? dt.dtb file to /boot/dt.dtb}}
  
 
== External Links ==
 
== External Links ==
 
* [[Rockchip]] wiki on building a Debian rootfs [http://opensource.rock-chips.com/wiki_Debian]
 
* [[Rockchip]] wiki on building a Debian rootfs [http://opensource.rock-chips.com/wiki_Debian]
 +
* [[Xunlong]]'s [[BSP Linux on Orange Pi 4]]: RK3399 external repository's [https://github.com/orangepi-xunlong/OrangePiRK3399_external/blob/master/extlinux/ extlinux configs] for eMMC / SD card
 +
* Arch Linux ARM [https://archlinuxarm.org/]
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** Generic AArch64 rootfs [https://archlinuxarm.org/platforms/armv8/generic]

Latest revision as of 23:20, 28 March 2020

Root filesystem for an Orange Pi 4.

Prerequisite: Linux kernel on Orange Pi 4

Next steps: Flashing Linux to SD Card

TODO: THIS PAGE

Base rootfs selection

There are various base root filesystem packages maintained by different Linux distributions, e.g. Debian, Arch Linux.

We'll be using Arch Linux ARM.

wget http://os.archlinuxarm.org/os/ArchLinuxARM-aarch64-latest.tar.gz

Partitioning

U-Boot supports booting from ext2/3/4 partitions. Thanks to this all we have to do is create a single ext2/3/4 partition on a storage device and put all the data onto this partition.

TODO: Create a single ext2/3/4 partition on an SD card / USB flash drive

TODO: Format the partition

Populating rootfs

TODO: Mount the storage to /mnt/disk

Run as root: bsdtar -xpf ArchLinuxARM-aarch64-latest.tar.gz -C /mnt/disk

Preparing /boot

See U-Boot for details on how first bootloaders prime the device and how it looks for a followup bootloader. We make use of a standardized syslinux (extlinux) bootloader configuration. Alternatively we could configure a U-Boot specific boot script or create a combined kernel + DTB boot.img image.

/boot/extlinux/extlinux.conf

label rockchip-kernel-4.4
    kernel /boot/Image
    fdt /boot/dt.dtb
    append earlycon=uart8250,mmio32,0xff1a0000 root=PARTUUID=B921B045-1D rootwait rootfstype=ext4 init=/sbin/init

This part enables dmesg printing to debug console right from the start: {{{1}}}

To find out PARTUUID, try ls /dev/disk/by-partuuid/* -all.

/boot/Image

TODO: Copy the compiled kernel Image file to /boot/Image

/boot/dt.dtb

TODO: Copy the compiled device tree ??? dt.dtb file to /boot/dt.dtb

External Links

Retrieved from "https://kb.d5o.eu/index.php?title=Linux_rootfs_on_Orange_Pi_4&oldid=228"