These notes and code are the preparation for a coures that I hopefully can monetize some day on some learning platform.
Raspbian OS Programming with the Raspberry Pi
- https://de.wikipedia.org/wiki/Raspberry_Pi
- https://github.com/thibmaek/awesome-raspberry-pi
- https://socialcompare.com/en/comparison/raspberrypi-models-comparison
- https://www.cl.cam.ac.uk/projects/raspberrypi/tutorials/os/
- https://jsandler18.github.io/
- https://github.com/bztsrc/raspi3-tutorial
- https://github.com/s-matyukevich/raspberry-pi-os
- https://ultibo.org/
- https://github.com/ultibohub/
- https://leiradel.github.io/2019/01/28/Bss-and-Peripheral-Base.html
- https://leiradel.github.io/2019/02/10/The-Mini-UART.html
- https://azeria-labs.com/memory-instructions-load-and-store-part-4/
- https://www.lowlevel.eu/wiki/ARM-OS-Dev_f%C3%BCr_Einsteiger
- http://bob.cs.sonoma.edu/IntroCompOrg-RPi/sec-inters.html
- https://www.pieter-jan.com/node/15
- https://learn.sparkfun.com/tutorials/raspberry-gpio/all
- https://github.com/eryjus/century/
- https://www.raspberrypi.org/magpi-issues/Projects_Book_v1.pdf
- https://isometimes.github.io/rpi4-osdev/part8-breakout-ble/
- https://www.codeproject.com/Articles/1158245/More-Fun-frustration-and-laughs-with-the-Pi-Part-I
Some general tips for the ARM website. When visiting a link to a document on the ARM website such as the ARMv5 reference manual for example, the page that loads in many cases does not directly contain the document in HTML form! It oftentimes does not even contain a link to download the PDF version! Instead you have to understand the web design of the ARM website. The ARM website contains a bar with more or less randomly selected actions such as switching between the light and dark theme. One of those options is a "Download" option. This is where you actually get access to the PDF version of the document you were looking for.
Also the ARMv5 Architecture Reference Manual describes ARMv4 and ARMv6 in a single PDF document. Only ARMv7, ARMv8 and all subsequent architectures received their indivdual documentation.
- ARM Introduction to the Cortex-A53
- ARM Learn the Architecture Cortex-A53
- ARM Exploration Tools
- ARM Assembly Instructions
- Programmers Guid
To test the OS on real hardware, the Raspberry PI 3 Model B+ is used.
The specification is contained here: (https://www.raspberrypi.org/products/raspberry-pi-3-model-b-plus)
Specification The Raspberry Pi 3 Model B+ is the final revision in the Raspberry Pi 3 range.
- CPU: Broadcom BCM2837B0, Cortex-A53 (ARMv8) 64-bit SoC @ 1.4GHz with 4 cores (quad-core)
- RAM: 1GB LPDDR2 SDRAM
- Bluetooth: 2.4GHz and 5GHz IEEE 802.11.b/g/n/ac wireless LAN, Bluetooth 4.2, BLE
- Ethernet: Gigabit Ethernet over USB 2.0 (maximum throughput 300 Mbps)
- GPIO: Extended 40-pin GPIO header
- HDMI: Full-size HDMI
- USB: 4 USB 2.0 ports
- CAMERA: CSI camera port for connecting a Raspberry Pi camera
- DSI: DSI display port for connecting a Raspberry Pi touchscreen display
- AUDIO: 4-pole stereo output and composite video port
- SD-SLOT: Micro SD port for loading your operating system and storing data
- POWER: 5V/2.5A DC power input
- PoE: Power-over-Ethernet (PoE) support (requires separate PoE HAT)
https://github.com/bztsrc/raspi3-tutorial/blob/master/README.md
qemu-system-aarch64 -M raspi3 -kernel kernel8.img -serial stdio
cd /temp
git clone https://github.com/bztsrc/raspi3-tutorial
cd raspi3-tutorial
git checkout efdae4e4b23c5b0eb96292f2384dfc8b5bc87538
apt-get install gcc-aarch64-linux-gnu
find . -name Makefile | xargs sed -i 's/aarch64-elf-/aarch64-linux-gnu-/'
cd 05_uart0
make
/tmp/qemu/aarch64-softmmu/qemu-system-aarch64 -nographic -M raspi3 -kernel kernel8.img -serial stdio
Q: Unable to init server: Could not connect: Connection refused
gtk initialization failed
A: Use -nographic
Q: EMU 5.0.1 monitor - type 'help' for more information
(qemu) qemu-system-aarch64: -serial stdio: cannot use stdio by multiple character devices
qemu-system-aarch64: -serial stdio: could not connect serial device to character backend 'stdio'
A: Start without -serial stdio
/tmp/qemu/aarch64-softmmu/qemu-system-aarch64 -nographic -M raspi3 -kernel kernel8.img
Use ^a x This means, press and hold Ctrl then press a, release Ctrl and a, then press x
https://bertrand.tognoli.fr/todo/work/MyOwnKernel.html
https://github.com/Chadderz121/csud
You need the USB stack not only for USB devices but also for the ethernet connection, because the ethernet connection is implemented as a hardware chip that actually converts USB to Ethernet. https://raspberrypi.stackexchange.com/questions/13241/bare-metal-programming-how-to-access-ethernet-hw-interface
https://metebalci.com/blog/bare-metal-rpi3-network-boot/
https://ownyourbits.com/2017/02/06/raspbian-on-qemu-with-network-access/