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Simplified Mini-HowTo

This is an addendum to the SolidRun README.md focusing on the CEx7 CN9132 EVK and creating a reproducible build.

Building

To build you need to have your GIT identity set up in ~/.gitconfig:

if [ ! -e ~/.gitconfig ]; then \
    echo "[user]"                    > ~/.gitconfig; \
    echo "name  = John Doe"         >> ~/.gitconfig; \
    echo "email = [email protected]" >> ~/.gitconfig; \
fi

Now you can start your first build, notice the script arguments to select the CEx7 CN9132 EVK. See the script comments for more information:

./run-docker.sh

If needed indivitual steps can be run by listing them.

./run-docker.sh linux-menuconfig linux rootfs sdcard

Note: There is no safe support for cleaning or restarting a build with some changes. To be 100% sure of your changes taking effect, remove the build/ directory. YMMV. Usually works fine.

Gotchas

You MUST change SW2 to boot from SD card:

SW2:  10110X

Beware, the DIP switches are fidgety and may easily get worn so that they slide out of their positions when you lift the board (to change SD card) :-/

Booting

First boot is important! Abort U-Boot to get a prompt so we can change the default device tree for our board:

Marvell>> setenv fdtfile marvell/cn9132-cex7.dtb
Marvell>> saveenv

Resume the boot by manually calling the bootcmd to launch Linux:

Marvell>> run bootcmd

Ubuntu Checklist

When booting up the board, we get a custom built kernel and unconfigured ubuntu-core. Meaning pretty much nothing is set up for us. Here's a checklist to get started:

  • Change /etc/hostname

  • Set up basic networking, use left-most Ethernet port (eth1). We have no editor yet, so we use a HERE script:

    cat <<EOF >/etc/network/interfaces.d/eth1
auto eth1
iface eth1 inet dhcp
EOF
ifup eth1

    You should get an IP address in the 172.21.104.0/24 range. Check with the ifconfig eth1 command.

  • For easier access during set up, allow root SSH logins:

    echo "PermitRootLogin yes" >> /etc/ssh/sshd_config
systemctl restart sshd

  • You can now log in to the board using SSH from your laptop:

    $ ssh [email protected]

  • Resize file system to fit the SD card:

  • Carefully wake up the package manager:

    apt update
apt install -y dialog
apt dist-upgrade

  • Add other useful tools:

    apt install -y nano vim mg nftables wireguard-tools

Note: if the serial console gets garbled during any of the above commands, use reset and stty sane to restore it.

Bridge Setup

The ports lan1, lan2, lan3, and lan4 on the EVK are connected to a Marvell 6341 switchcore, which Linux gives us as isolated ports. These are set up as bridge, to enable switching between them, with the following configuration in /etc/network/interfaces.d/bridge:

# Bridge of LAN ports with VLAN interface on top. 
# The following is an illustration of an example. 
# The actual setup is all lanX ports in the same 
# VLAN and only one VLAN interface on top. 
# 
#     vlan1     vlan2      Layer-3 :: IP networking 
#          \   /           ------------------------------- 
#           br0 
#      ______|_______      Layer-2 :: Switching 
#     [#_#_#_#_#_#_#]  
#     /  |   :  |    \     ------------------------------- 
# lan2 lan1  : lan4 lan3   Layer-1 :: Link layer 
#            : 
#   VLAN 1   :    VLAN

auto vlan1 
iface vlan1 inet static 
        pre-up ip link add br0 type bridge vlan_filtering 1 
        pre-up ip link set lan1 master br0 
        pre-up ip link set lan2 master br0 
        pre-up ip link set lan3 master br0 
        pre-up ip link set lan4 master br0 
        pre-up bridge vlan add vid 1 dev br0 self 
        pre-up ip link add name vlan1 link br0 type vlan id 1 
        pre-up ip link set lan1 up 
        pre-up ip link set lan2 up 
        pre-up ip link set lan3 up 
        pre-up ip link set lan4 up 
        pre-up ip link set br0 up 
        address 198.18.105.10 
        netmask 255.255.255.0