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移植成功
以下是制作ubuntu20.04的rootfs的方法

Requirements

1. An x86_64 machine with Ubuntu or another Linux distribution installed.
2. `debootstrap` tool.
3. Internet connection.
4. Basic knowledge of using the terminal.

Steps to Create Ubuntu 20.04 Rootfs for ARMhf

1. Install Required Tools

First, ensure that `debootstrap` and `qemu-user-static` are installed. `qemu-user-static` allows you to run ARM binaries on your x86_64 machine.

sudo apt update
sudo apt install debootstrap qemu-user-static

2. Create a Directory for the Rootfs

Create a directory where the root filesystem will be built.

mkdir -p ~/ubuntu-armhf-rootfs

3. Run Debootstrap

Use `debootstrap` to create the root filesystem. Specify the architecture (`armhf`), the Ubuntu release (`focal`), and the target directory.

sudo debootstrap --arch=armhf --foreign focal ./ubuntu-armhf-rootfs https://mirrors.bfsu.edu.cn/ubuntu-ports/

4. Copy QEMU Binary

Copy the `qemu-arm-static` binary into the `usr/bin` directory of the new rootfs to enable emulation.

sudo cp /usr/bin/qemu-arm-static ./ubuntu-armhf-rootfs/usr/bin/

5. Chroot into the New Rootfs

Change root into the new root filesystem to complete the second stage of debootstrap.

sudo chroot ./ubuntu-armhf-rootfs

6. Complete Debootstrap Second Stage

Inside the chroot environment, run the second stage of debootstrap.

/debootstrap/debootstrap --second-stage

7. Configure the Rootfs

Now configure the basic settings of your new root filesystem.

- Set the hostname:

echo "ubuntu-armhf" > /etc/hostname

- Set up the hosts file:

cat <<EOL > /etc/hosts
127.0.0.1   localhost
127.0.1.1   ubuntu-armhf
EOL

- Create fstab:

cat <<EOL > /etc/fstab
proc            /proc           proc    defaults        0       0
sysfs           /sys            sysfs   defaults        0       0
devpts          /dev/pts        devpts  gid=5,mode=620  0       0
tmpfs           /run            tmpfs   defaults        0       0
tmpfs           /run/lock       tmpfs   nodev,nosuid,noexec 0   0
EOL

- Set up networking:

cat <<EOL > /etc/network/interfaces
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp
EOL

- Set the root password:

passwd

- Create a user:

adduser ubuntu
usermod -aG sudo ubuntu

- Install essential packages:

apt update
apt install sudo nano ssh

8. Exit the Chroot

Exit the chroot environment.

exit

9. Clean Up

Remove the `qemu-arm-static` binary from the rootfs.

sudo rm ./ubuntu-armhf-rootfs/usr/bin/qemu-arm-static

10. Package the Rootfs

Finally, create a tarball of the root filesystem.

sudo tar -czvf ubuntu-20.04-armhf-rootfs.tar.gz -C ./ubuntu-armhf-rootfs .

在移植完后会发现会有readonly fs的问题，其实就是挂载的时候没给rw
bootargs改为

setenv bootargs console=ttyS0,115200 earlyprintk root=/dev/mmcblk0p2 rootwait rw panic=10

就一切正常了

@qlOvQlp
大佬的hdk能开源上来看一下吗？😀😀

太强了，所以sdk有大佬开源吗😀😀