https://github.com/mdamiani/minirootfs

Mini Linux root filesystem, for mini embedded systems.
https://github.com/mdamiani/minirootfs

arm busybox embedded-linux linux-kernel qemu qemu-system-arm rootfs

Last synced: about 1 month ago
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Mini Linux root filesystem, for mini embedded systems.

• Host: GitHub
• URL: https://github.com/mdamiani/minirootfs
• Owner: mdamiani
• License: gpl-3.0
• Created: 2024-04-02T16:53:33.000Z (9 months ago)
• Default Branch: main
• Last Pushed: 2024-04-19T07:55:28.000Z (8 months ago)
• Last Synced: 2024-10-12T07:41:20.648Z (2 months ago)
• Topics: arm, busybox, embedded-linux, linux-kernel, qemu, qemu-system-arm, rootfs
• Language: Shell
• Homepage:
• Size: 23.4 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Mini RootFS

This script creates a very simple rootfs.

It uses BusyBox[https://busybox.net/], in order to provide basic UNIX utilities.

A cross-compilation toolchain is needed for building. The script was tested with an

[ARM toolchain](https://toolchains.bootlin.com/downloads/releases/toolchains/armv5-eabi/tarballs/armv5-eabi--glibc--stable-2023.08-1.tar.bz2),

with glibc C library, for Linux.

## Usage

Please note the requirement about `fakeroot`, to set correct files permissions.

The output is an initramfs CPIO archive, `initramfs.cpio.gz`, as small as about 3MB.

```

fakeroot ./minirootfs.sh arm-buildroot-linux-gnueabi-

```

## Test

The rootfs may be tested with an actual Linux Embedded board, or with a development machine using:

  - [QEMU](https://www.qemu.org/).

  - A recent [Linux](https://www.kernel.org/) kernel.

```

qemu-system-arm -m 128M -M virt -nographic -kernel /path/to/linux-6.8.7/arch/arm/boot/zImage -initrd ./initramfs.cpio.gz -append "root=/dev/ram0"

```

The Linux kernel may be compiled with the same toolchain:

```

wget https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.8.7.tar.xz

tar xf linux-6.8.7.tar.xz

cd linux-6.8.7

make ARCH=arm CROSS_COMPILE=arm-buildroot-linux-gnueabi- defconfig

make ARCH=arm CROSS_COMPILE=arm-buildroot-linux-gnueabi- kvm_guest.config

make ARCH=arm CROSS_COMPILE=arm-buildroot-linux-gnueabi- zImage

```