CPU
| Aspect | Spec |
|---|---|
| Arch | ARM RISC ? |
| Instruction Size | 64bit |
| Cores | 4 |
| Frequency | 1.2GHz |
| Manufacturer | Broadcom |
| Model | BCM2837 |
Other Components
| Component | Spec |
|---|---|
| RAM | 1GB RAM |
| Wifi | BCM43438 wireless LAN |
| BT | BTLE |
| Ethernet | 100 Base |
| GPIO | 40-pin extended |
| USB | 4xUSB 2 |
| Audio Out | 4 Pole stereo |
| Video | composite, HDMI |
CPU
| Aspect | Spec |
|---|---|
| Arch | ARM RISC ? |
| Instruction Size | 64bit |
| Cores | 4 |
| Frequency | 1.5GHz |
| Manufacturer | Broadcom |
| Model | BCM2711 Cortex-A72 |
Other Components
| Component | Spec |
|---|---|
| RAM | 2GB, 4GB or 8GB LPDDR4-3200 SDRAM |
| Wifi | 2.4 GHz and 5.0 GHz IEEE 802.11ac wireless |
| BT | Bluetooth 5.0, BLE |
| Ethernet | Gigabit |
| GPIO | Raspberry Pi standard 40 pin GPIO header (fully backwards compatible with previous boards) |
| USB | 2xUSB3, 2xUSB2. |
| Audio Out | 4-pole stereo audio |
| Video | 2 × micro-HDMI ports (up to 4kp60 supported), 2-lane MIPI DSI display port, 2-lane MIPI CSI camera port |
| Graphics | OpenGL ES 3.0 |
- dowload & install rpi imager from https://www.raspberrypi.org/software/
- use rpi imager to choose, download & copy image to SD card
The installed VNC server () is non-proprietary, and the de facto Ubuntu client (Remmina) - has authentication problems with the prop protocol. I ultimately found TightVNC to be the best VNC server option for Raspbian. (x11vnc did not seem to support headless mode well).
# uninstall RealVNC server
$ sudo apt-get remove realvnc-vnc-server
# install TightVNC server
$ sudo apt-get install tightvncserver
# manually launch tightvncserver on a headless (display 0) machine, with resolution 800x600
$ sudo tightvncserver :0 -geometry 800x600
# follow promts to define vnc password (use for client connection)
# kill existing VNC session on display 0
$ sudo tightvncserver -kill :0
# configure TightVNC to automatically start on server boot
# 1. edit /etc/rc.local
$ sudo nano /etc/rc.local
# 2. add line
$ sudo tightvncserver :0 -geometry 800x600
# 3 reboot
$ sudo reboot -h 0
fix for disappearing menu bar (from max_g) https://www.raspberrypi.org/forums/viewtopic.php?t=191765
# assuming that VNC has been previously started with headless session 0, i.e. with display :0
# stop VNC
$ sudo tightvncserver -kill :0
# edited config file to start session with LXDE:
$ nano ~/.vnc/xstartup
# add line
lxterminal & /usr/bin/lxsession -s LXDE &
# save and exit
# reboot
$ sudo reboot -h 0
- determine which device is mapped to the SD card
list block devices
$ lsblk
ubuntu: locate the device with both /system-boot & /writable
sdb 8:16 1 14.5G 0 disk
├─sdb1 8:17 1 256M 0 part /media/david/system-boot
└─sdb2 8:18 1 14.2G 0 part /media/david/writable
- backup the SD card
from device /dev/sdb
to /home/xxx/image.img
with block-size of 1 MB
$ sudo dd if=/dev/sdb of=/home/xxx/image.img bs=1M progress=status
links
# update software package repo listings
$ sudo apt update
# upgrade everything to latest
$ sudo apt full-upgrade
# update rpi tools
$ sudo rpi-update
# reboot pi
$ sudo reboot -h 0
wait for system to restart, then login again
# install latest bootloader
$ sudo rpi-eeprom-update -d -a
BCM2711 detected
Dedicated VL805 EEPROM detected
BOOTLOADER: up-to-date
CURRENT: Thu Sep 3 12:11:43 UTC 2020 (1599135103)
LATEST: Thu Sep 3 12:11:43 UTC 2020 (1599135103)
FW DIR: /lib/firmware/raspberrypi/bootloader/critical
VL805: up-to-date
CURRENT: 000138a1
LATEST: 000138a1
# reboot pi
$ sudo reboot -h 0
wait for system to restart, then login again
launch rpi config utility
$ sudo raspi-config