zhanglongqi

Generic howto for Allwinner devices

Legacy or current kernel ?

Many Armbian images come in two flavours : Legacy (using an older kernel version) and current (up-to-date LTS kernel). Depending on kernel version, the procedure to enable/disable features is not the same.

• Legacy kernel (5.4.x): DT (Device Tree) overlays
• Current kernel (5.10.x) : DT (Device Tree) overlays

Note: Support for older kernel versiones (like 3.4.x or 3.10.x) has been dropped.

zhanglongqi

AAA-auto-starter-for-motionmark

zhanglongqi

Thanks to https://www.thegeekdiary.com/how-to-clone-linux-disk-partition-over-network-using-dd/

Clone using telnet and bzip has advantages to reduce clone time, but make sure you use a secure network.

Lets assume server-B has ip address 192.168.100.2 Run this command in server B (destination):

# nc -l -p 19000 | bzip2 -d | dd bs=16M of=/dev/sda

zhanglongqi

def main(prefix: str, start: int, ip: int, total: int):
	for t in range(total):
		with open(f'{prefix}{start+t:04}', 'w') as f:
			f.write(f'ifconfig-push 10.8.0.{ip+t} 255.255.0.0')
			f.write('\n')

if __name__ == '__main__':
	import argparse

	parser = argparse.ArgumentParser()

zhanglongqi

XZ

1. Compress a file (filename.sql will be replaced by filename.sql.xz)

xz filename.sql

2. Uncompress file (filename.sql.xz will be replaced by filename.sql)

zhanglongqi

Code composer studio on HiDPI

Adjust the icon by adding -Dswt.autoScale=200 to ccstudio.ini

Audacity

export GDK_SCALE=2

export GDK_DPI_SCALE=0.5

zhanglongqi

The board I am using is Beaglebone Black Enhanced, kernel: 4.19.94-ti-r57, wifi model 0bda:b720

If you are using kernel 5.4 then just use rtl8xxxu instead of 8723bu.

$ modinfo 8723bu
filename:       /lib/modules/4.19.94-ti-r57/kernel/drivers/net/wireless/8723bu.ko
version:        v4.3.6.11_12942.20141204_BTCOEX20140507-4E40
author:         Realtek Semiconductor Corp.

zhanglongqi

For issue like

awk: include/scan.awk: line 21: function asort never defined

We can solve it by

sudo apt-get install gawk

zhanglongqi

---
Language:        Cpp
# BasedOnStyle:  WebKit
AccessModifierOffset: -4
AlignAfterOpenBracket: Align
AlignConsecutiveAssignments: true
AlignConsecutiveDeclarations: true
AlignEscapedNewlinesLeft: false
AlignOperands:   true
AlignTrailingComments: true

zhanglongqi

disable autostarted services

sudo systemctl disable bonescript-autorun.service bonescript.socket node-red.socket nginx.service cloud9.socket

share internet from host by USB

on BBB