Riscv64创建ubuntu文件系统
UBUNTU系统内核必须要开启的支持模块：
CONFIG_CGROUPS=y
CONFIG_CGROUP_FREEZER=y
CONFIG_CGROUP_PIDS=y
CONFIG_CGROUP_DEVICE=y
CONFIG_CPUSETS=y
CONFIG_PROC_PID_CPUSET=y
CONFIG_CGROUP_CPUACCT=y
CONFIG_PAGE_COUNTER=y
CONFIG_MEMCG=y
CONFIG_CGROUP_SCHED=y
CONFIG_NAMESPACES=y
CONFIG_OVERLAY_FS=y
CONFIG_AUTOFS4_FS=y
CONFIG_SIGNALFD=y
CONFIG_TIMERFD=y
CONFIG_EPOLL=y
CONFIG_IPV6=y
CONFIG_FANOTIFY
CONFIG_CGROUP_BPF=y
CONFIG_TMPFS=y
CONFIG_TMPFS_POSIX_ACL=y
# optional (开启 zram 内存压缩):
CONFIG_ZSMALLOC=y
CONFIG_ZRAM=y
文件系统创建：
Important: to reduce ram usage follow point n.2 of the ,
to increase the rootfs partition size you can edit ```duo-buildroot-sdk/milkv/genimage-milkv-duo.cfg```
at line 16 replace ```size = 256M``` with ```size = 1G``` or higher as desired
then follow the  to manually compile buildroot and the kernel and pack it.
## Creating the rootfs
```bash
# install prerequisites
sudo apt install debootstrap qemu qemu-user-static binfmt-support dpkg-cross --no-install-recommends
# generate minimal bootstrap rootfs
sudo debootstrap --arch=riscv64 --foreign jammy ./temp-rootfs http://ports.ubuntu.com/ubuntu-ports
# chroot into the rootfs we just created
sudo chroot temp-rootfs /bin/bash
# run 2nd stage of deboostrap
/debootstrap/debootstrap --second-stage
# add package sources
cat >/etc/apt/sources.list <<EOF
deb http://ports.ubuntu.com/ubuntu-ports jammy main restricted
deb http://ports.ubuntu.com/ubuntu-ports jammy-updates main restricted
deb http://ports.ubuntu.com/ubuntu-ports jammy universe
deb http://ports.ubuntu.com/ubuntu-ports jammy-updates universe
deb http://ports.ubuntu.com/ubuntu-ports jammy multiverse
deb http://ports.ubuntu.com/ubuntu-ports jammy-updates multiverse
deb http://ports.ubuntu.com/ubuntu-ports jammy-backports main restricted universe multiverse
deb http://ports.ubuntu.com/ubuntu-ports jammy-security main restricted
deb http://ports.ubuntu.com/ubuntu-ports jammy-security universe
deb http://ports.ubuntu.com/ubuntu-ports jammy-security multiverse
EOF
# update and install some packages
apt-get update
apt-get install --no-install-recommends -y util-linux haveged openssh-server systemd kmod initramfs-tools conntrack ebtables ethtool iproute2 iptables mount socat ifupdown iputils-ping vim dhcpcd5 neofetch sudo chrony
# optional for zram
apt-get install zram-config
systemctl enable zram-config
# Create base config files
mkdir -p /etc/network
cat >>/etc/network/interfaces <<EOF
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
EOF
cat >/etc/resolv.conf <<EOF
nameserver 1.1.1.1
nameserver 8.8.8.8
EOF
# write text to fstab (this is with swap enabled if you want to disable it just put a # before the swap line)
cat >/etc/fstab <<EOF
# <file system> <mount pt> <type> <options> <dump> <pass>
/dev/root / ext2 rw,noauto 0 1
proc /proc proc defaults 0 0
devpts /dev/pts devpts defaults,gid=5,mode=620,ptmxmode=0666 0 0
tmpfs /dev/shm tmpfs mode=0777 0 0
tmpfs /tmp tmpfs mode=1777 0 0
tmpfs /run tmpfs mode=0755,nosuid,nodev,size=64M 0 0
sysfs /sys sysfs defaults 0 0
/dev/mmcblk0p3 none swap sw 0 0
EOF
# set hostname
echo "milkvduo-ubuntu" > /etc/hostname
# set root passwd
echo "root:riscv" | chpasswd
# enable root login through ssh
sed -i "s/#PermitRootLogin.*/PermitRootLogin yes/g" /etc/ssh/sshd_config
# exit chroot
exit
sudo tar -cSf Ubuntu-jammy-rootfs.tar -A
# 1.挂载root分区，替换为你的设备
sudo mount /dev/sdb2 /mnt/sdroot
# 2.清空分区
sudo rm -rf /mnt/sdroot/*
# 3.直接解压rootfs
sudo tar -xf Ubuntu-jammy-rootfs.tar -C /mnt/sdroot
# 4.卸载
sudo umount /mnt/sdroot
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