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qemu_mips

This project contains extension for buildroot project. Main purposes:

  • Train embedded development technics
  • MVP for auto-tests

Build

Requirements

  • GCC 7.4 - 9.x
  • make
  • cpio
  • rsync
  • bc
  • qemu

You can use docker image buildroot/base instead.

Make options

# Create images
make
# Smoke run
make test
# Play inside of firmware
make qemu_shell

What you can check now

One little thing about boot process

The project tries to reproduce real hardware (not malta) and run in QEMU. Many hardware vendors use the u-boot as bootloader for their boards. So in this project we have to use the same way to boot:

u-boot -> Linux Kernel -> Application

u-boot environment

# Start qemu
make qemu_shell

# 1. Wait for Linux boot
# 2. Login with root/root credentials
# 3. Print u-boot environment
fw_printenv
# 4. Change and check u-boot environment
fw_setenv test success
reboot
# 5. After u-boot starts you have 2 seconds to interrupt the boot process - just hit ENTER
# 6. Check the environment
> printenv test
test=success

System update

# 1.   Create update file
make update
# 2.   In separated console create simple http-server (thats how we download the update)
python3 -m http.server -b YOUR_IP
# 3.   Start qemu
make qemu_shell
# 4.   Wait for Linux boot
# 5.   Login with root/root credentials
# 6.   Check current system status
rauc status
# 6.1. Output example
=== System Info ===
Compatible:  qemu_mips
Variant:     
Booted from: rootfs.0 (A)

=== Bootloader ===
Activated: rootfs.0 (A)

=== Slot States ===
o [rootfs.1] (/dev/hda3, ext4, inactive)
        bootname: B
        boot status: good

x [rootfs.0] (/dev/hda2, ext4, booted)
        bootname: A
        boot status: good
# 7.   Install update
rauc -d install http://YOUR_IP:8000/build/rootfs.raucb
reboot
# 8.   Check current system status
rauc status
# 8.1. Output example
=== System Info ===
Compatible:  qemu_mips
Variant:     
Booted from: rootfs.1 (B)

=== Bootloader ===
Activated: rootfs.1 (B)

=== Slot States ===
x [rootfs.1] (/dev/hda3, ext4, booted)
        bootname: B
        boot status: good

o [rootfs.0] (/dev/hda2, ext4, inactive)
        bootname: A
        boot status: good