Method on Buddhist's Diamond

I don't why translating this to English feels harder than translating to Japanese. Here I am and I updated this article with some new revelations unknown when I wrote the Chinese version, and got rid of some false conclusions.   Introduction BD consists of 33 familiars that fires lasers, random star bullets, and a series of aimed arrow heads from Kaguya. The interval of which the lasers are fired is actually not constant, the first two lasers are 200 frames apart, the later ones are 180 frames apart. The first aimed bullets is spawned 128 frames after the first laser, and is fired every 144 frames afterwards. The arrow heads fly very slowly, and the next wave is spawned before the previous wave leaves the screen. Similarly for lasers, the next wave start to appear before the previous wave fades off. We can model the laser, starting from the second wave by: \(\sin\left(\frac{\pi}{180}\left(x-200\right)\right)=0\left\{x>199\right\}\) aimed arrow heads: \(\sin\left(\frac{\pi...

Install Arch Linux on Raspberry Pi 4

Why don't just install Raspbian the officially supported linux distribution for Raspberry Pi? Because I don't want to (although it is the only system that can update the firmware of Rpi 4).


The installation media can be obtained from here, however before following the last step to populate the arch package signing keys, I followed these steps (I am not sure if they are necessary).

By default the system would turn down the wifi interface due to regulatory domain. Edit /etc/conf.d/wireless-regdom and uncomment the corresponding line would make wireless network work properly (source).

Wifi can be configured with wifi-menu. However, for more complicated setup like eduroam, manually creating a wpa_supplicant.conf is required (see this). Sadly the official eduroam CAT only creates a profile for Network Manager, which arch does not use by default and is a GUI tool.

wifi-menu will create a netctl profile automatically, you can check under /etc/netctl/ and use netctl is-enabled profile to check if the network has been configured to start at boot.

By default the user alarm has password alarm which should be changed. Since I am only using ssh to access this machine I just leave the root user as it is.

From then you should be updating the system, etc. I would suggest doing a backup of the system (use dd to create an image of the sd card).
I do think a better solution should be desireable as dd always creates a file that is the same size of the sd card regardless how much data is actually stored, so I ended up with these huge 64GB images and my computer is really slow compressing them...

Aside: I tried to install LXQt but failed with some mysterious error when pacman provided with me several different versions of some pacakages which I cannot even learn what they do...




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