Page Comparison

The SP7350 supports six ten root file systems:

• BusyBox 1.31.1

• Ubuntu Server 20.04.6 / 22.04.4

• Ubuntu MATE 20.04.6 / 22.04.4

• Ubuntu XFCE 20.04.6 / 22.04.4

• Buildroot 2024.02

• Yocto 4.2.4

• Yocto 3.0.2 (32-bit)

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After completing the build process, the compiled root filesystem is located at:

linux/rootfs/initramfs/disk/

The image of the target root filesystem is then made and stored at:

out/rootfs.img

2. BusyBox 1.31.1

BusyBox constructs a lightweight root file system for embedded Linux systems by combining tiny versions of many common UNIX utilities into a single small executable, often just a few hundred kilobytes. This reduces the overall memory footprint and system overhead compared to having separate executables for each utility, contributing to faster boot times.

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Users can use menuconfig of BusyBox to select additional utilities. Navigate to the BusyBox directory (:

linux/rootfs/initramfs/busybox-1.31.1

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And run ‘make menuconfig’, for example:

wellslu@scdiu3:~/Q654/linux/rootfs/initramfs/busybox-1.31.1$ make menuconfig

A BusyBox Configuration menu will appear:

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wellslu@scdiu3:~/q654/test$Q654$ ll linux/rootfs/initramfs/disk/usr/sbin/tftp*
lrwxrwxrwx 1 wellslu sp 17 Jun  4 18:57 linux/rootfs/initramfs/disk/usr/sbin/tftpd -> ../../bin/busybox*
wellslu@scdiu3:~/q654/test$Q654$

To update your settings as the default configuration, copy the file 'linux/rootfs/initramfs/busybox-1.31.1/.config' to 'linux/rootfs/initramfs/configs/bbx_dynamic_defconfig':

wellslu@scdiu3:~/q654Q654/test/linux/rootfs/initramfs/busybox-1.31.1$ cp .config ../configs/bbx_dynamic_defconfig 
wellslu@scdiu3:~/q654/testQ654/linux/rootfs/initramfs/busybox-1.31.1$

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The snapshot of the virtual terminal (tty1) on LCD MIPI/DSI or HDMI display:

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3. Ubuntu Server 20.04.6 / 22.04.4

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• ubuntu-standard

• ubuntu-minimal

• ubuntu-server

• curl

• iputils-ping

• net-tools

• network-manager

• openssh-server

The pre-built root file-system has limited utilities or packages. Users can extend the functionality by installing extra utilities or packages from Ubuntu APT servers on the internet. For example, to install iperf3, users can issue the following commands:

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• ubuntu-standard

• ubuntu-minimal

• ubuntu-mate-desktop

• curl

• iputils-ping

• net-tools

• openssh-server

• oem-config-gtk

The pre-built root file-system has limited utilities or packages. Users can extend the functionality by installing extra utilities or packages from Ubuntu APT servers on the internet.

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• ubuntu-standard

• ubuntu-minimal

• xubuntu-desktop

• curl

• iputils-ping

• net-tools

• openssh-server

• oem-config-gtk

The following packages are removed:

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wellslu@scdiu3:~/q654/test$Q654$ ll linux/rootfs/initramfs/disk/lib64/libdrm*
lrwxrwxrwx 1 wellslu sp    11 Jun  3 17:34 linux/rootfs/initramfs/disk/lib64/libdrm.so -> libdrm.so.2*
lrwxrwxrwx 1 wellslu sp    15 Jun  3 17:34 linux/rootfs/initramfs/disk/lib64/libdrm.so.2 -> libdrm.so.2.4.0*
-rwxr-xr-x 1 wellslu sp 91952 Jun  3 17:34 linux/rootfs/initramfs/disk/lib64/libdrm.so.2.4.0*
wellslu@scdiu3:~/q654/test$Q654$ 
wellslu@scdiu3:~/q654/test$Q654$ ll linux/rootfs/initramfs/disk/usr/bin/modetest
-rwxr-xr-x 1 wellslu sp 83864 Jun  3 17:34 linux/rootfs/initramfs/disk/usr/bin/modetest*
wellslu@scdiu3:~/q654/testQ654

To save the modifications to the defconfig file, go to the Buildroot directory and run 'make savedefconfig':

wellslu@scdiu3:~/q654/test$Q654$ cd linux/rootfs/initramfs/buildroot/
wellslu@scdiu3:~/q654/testQ654/linux/rootfs/initramfs/buildroot$
wellslu@scdiu3:~/q654/testQ654/linux/rootfs/initramfs/buildroot$ make savedefconfig

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wellslu@scdiu3:~/q654/testQ654/linux/rootfs/initramfs/buildroot$ git diff
diff --git a/initramfs/buildroot/configs/sp7350_defconfig b/initramfs/buildroot/configs/sp7350_defconfig
index 428643a0..b13475db 100644
--- a/initramfs/buildroot/configs/sp7350_defconfig
+++ b/initramfs/buildroot/configs/sp7350_defconfig
@@ -6,6 +6,8 @@ BR2_TOOLCHAIN_BUILDROOT_CXX=y
 BR2_GCC_ENABLE_GRAPHITE=y
 BR2_INIT_SYSTEMD=y
 BR2_SYSTEM_BIN_SH_BASH=y
+BR2_PACKAGE_LIBDRM=y
+BR2_PACKAGE_LIBDRM_INSTALL_TESTS=y
 BR2_PACKAGE_BC=y
 BR2_PACKAGE_DHCP=y
 BR2_PACKAGE_DHCP_RELAY=y
wellslu@scdiu3:~/q654/testQ654/linux/rootfs/initramfs/buildroot$

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