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QEMU Debian ARMHF setup instructions

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Damian Pfammatter
2024-08-21 13:37:49 +02:00
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docs/1_setup.md
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## ARMHF Guest System
**Note**: In the following, we assume that the variable `$ROOTFS` points to the firmware's root
filesystem, as set in section [Analysis / Host System](./1_setup.md#analysis--host-system).
- Setup an ARMHF guest system (recommended: *QEMU* ARMHF Debian VM).
- Setup an ARMHF guest system (recommended: [QEMU ARMHF Debian VM](./1_setup_guest.md)).
- Copy the directories `$ROOTFS/` and `server/` to the ARMHF guest system.
Execute the following instructions within the ARMHF guest system:
docs/1_setup_guest.md
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# Setup QEMU Debian ARMHF
The below instructions might be used to setup a _QEMU Debian ARMHF_ virtual machine (VM).
## Installing
Install the _QEMU Debian ARMHF_ VM:
```shell
# Download Kernel and initial RAM disk
mkdir Debian-11.10-ARMHF && cd Debian-11.10-ARMHF/
wget http://http.us.debian.org/debian/dists/Debian11.10/main/installer-armhf/current/images/netboot/vmlinuz
wget http://http.us.debian.org/debian/dists/Debian11.10/main/installer-armhf/current/images/netboot/initrd.gz
# Install dependencies
sudo apt install qemu qemu-kvm qemu-system-arm libguestfs-tools
# Create disk image
qemu-img create -f qcow2 debian-11.10-armhf.qcow2 10G
# Install the system
qemu-system-arm -machine virt -m 1024 \
-kernel vmlinuz \
-initrd initrd.gz \
-drive if=none,file=debian-11.10-armhf.qcow2,format=qcow2,id=hd \
-device virtio-blk-device,drive=hd \
-netdev user,id=mynet \
-device virtio-net-device,netdev=mynet \
-nographic -no-reboot
```
**Note**: Finish the installation without installing the _GRUB_ boot loader.
## Extracting the Kernel and Initial RAM Disk
Identify and extract the Kernel and initial RAM disk:
```shell
# Identify
sudo virt-ls -a debian-11.10-armhf.qcow2 /boot/
# Output:
# System.map-5.10.0-30-armmp-lpae
# System.map-5.10.0-32-armmp-lpae
# config-5.10.0-30-armmp-lpae
# config-5.10.0-32-armmp-lpae
# initrd.img
# initrd.img-5.10.0-30-armmp-lpae
# initrd.img-5.10.0-32-armmp-lpae
# initrd.img.old
# lost+found
# vmlinuz
# vmlinuz-5.10.0-30-armmp-lpae
# vmlinuz-5.10.0-32-armmp-lpae
# vmlinuz.old
# Extract
sudo virt-copy-out -a debian-11.10-armhf.qcow2 \
/boot/vmlinuz-5.10.0-32-armmp-lpae \
/boot/initrd.img-5.10.0-32-armmp-lpae \
.
```
## Running
Start the VM using a helper script:
```shell
# Create run script
cat << EOF > run.sh
#!/bin/bash
qemu-system-arm -machine virt -m 1024 \
-kernel vmlinuz-5.10.0-32-armmp-lpae \
-initrd initrd.img-5.10.0-32-armmp-lpae \
-append 'root=/dev/vda2' \
-drive if=none,file=debian-11.10-armhf.qcow2,format=qcow2,id=hd \
-device virtio-blk-device,drive=hd \
-netdev user,id=mynet,hostfwd=tcp::3000-:3000,hostfwd=tcp::3022-:22 \
-device virtio-net-device,netdev=mynet \
-nographic
EOF
# Make the script executable an run it
sudo chmod +x run.sh
./run.sh
```
## Configuring
Log in to the VM and perform the following configuration steps:
```shell
# Update system and install sudo
su -
apt update && apt full-upgrade -y
apt install sudo
# Add user to sudo group
usermod -aG sudo <USER>
su - <USER>
# Install gdbserver
sudo apt install -y gdbserver
```
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