110 lines
2.9 KiB
Markdown
110 lines
2.9 KiB
Markdown
# Single Board Computer Notes
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[Balena Etcher](https://www.balena.io/etcher/) is a popular tool to flash OS images to SD cards & USB drives.
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rusEFI console in headless mode is known to work on Raspberry 3.
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_buster_ is codename for Debian version 10.
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Ubuntu is a Debian fork. _focal_ is a codename for one of Ubuntu releases.
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Raspberry Pi OS (previously called Raspbian) is based on Debian.
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## Notes on setup
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Wifi password is in `/etc/network/interfaces` file
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```shell
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sudo dhclient wlan0
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```
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## Armbian
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Default root password 1234
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Default baud rate 115200
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[Raspberry PI wifi headless setup](https://www.hackster.io/mexmarv/iot-raspberry-pi-wifi-headless-setup-6be0de)
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[Raspberry PI fast boot](https://www.furkantokac.com/rpi3-fast-boot-less-than-2-seconds/)
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### latest packages
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```shell
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sudo apt-get update && apt-get upgrade
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sudo apt-get remove --purge triggerhappy logrotate dphys-swapfile
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sudo rm -rf /var/lib/dhcp /var/lib/dhcpcd5 /var/spool /etc/resolv.conf
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sudo ln -s /tmp /var/lib/dhcp
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sudo ln -s /tmp /var/lib/dhcpcd5
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sudo ln -s /tmp /var/spool
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sudo touch /tmp/dhcpcd.resolv.conf
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sudo ln -s /tmp/dhcpcd.resolv.conf /etc/resolv.conf
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sudo rm /var/lib/systemd/random-seed
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sudo ln -s /tmp/random-seed /var/lib/systemd/random-seed
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ExecStartPre=/bin/echo "" >/tmp/random-seed
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```
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## Hardware
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[Orange Pi Zero GPIO Pins](https://kaspars.net/blog/orange-pi-zero-gpio)
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[Single Board Computers - Forum](https://rusefi.com/forum/viewtopic.php?p=37563#p37563)
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[NanoPi Duo2 Dimensions](http://wiki.friendlyarm.com/wiki/index.php/NanoPi_Duo2#Dimensional_Diagram)
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### SD card preparation
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Resize primary partition [Resizing RPi Partitions](https://elinux.org/RPi_Resize_Flash_Partitions#Resizing)
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```shell
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lsusb
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lsblk
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resize2fs /dev/sdb 4g
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parted /dev/sdb
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resizepart 1
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4300 works good for 4g filesystem
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quit
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e2fsck -f /dev/sdb1
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fdisk -l /dev/sdb
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to see last used sector and total number of sectors
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fdisk /dev/sdb
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n for 'new'
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p for 'primary'
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2
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begin (last used sector+1)
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end ( total number of sectors -1)
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blkid /dev/sdb2 | awk -F'"' '{print $2}'
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UUID=0e281f8d-1117-451d-9b1b-b07405a631bc /rw auto nosuid,nodev,nofail 0 0
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```
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now add ",ro" into /etc/fstab
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[Make your Raspberry Pi file system read-only](https://medium.com/swlh/make-your-raspberry-pi-file-system-read-only-raspbian-buster-c558694de79)
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```shell
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backup
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dd if=/dev/sdb of=2021_July_26_orange_zero.img
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```
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## Orange PI CI setup
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[Orange Pi Zero](https://www.armbian.com/orange-pi-zero/)
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```shell
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wget <https://redirect.armbian.com/orangepizero/Buster_current.torrent>
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sudo apt-get install transmission-cli transmission-common transmission-daemon
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transmission-remote -n 'transmission:transmission' -a Buster_current.torrent
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lsblk -p
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sudo apt install xz-utils
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xzcat /var/lib/transmission-daemon/downloads/Armbian_21.05.6_Orangepizero_buster_current_5.10.43.img.xz > Orangepizero.img
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sudo dd if=Orangepizero.img of=/dev/sdb bs=4M conv=fsync
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```
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