FUZIX VS linux

Alan Cox has a "Fuzix" repo, that puts together Uzix variants for the Z80.

https://github.com/EtchedPixels/FUZIX

Fuzix does appear to have CPU support for 6800 and is probably your best starting location. Although based on what I've seen of the ET-3400 you could be in for quite the uphill struggle.

Software complexity also helps to establish or maintain the predominance of large corporations on the market. In contrast, a simple software system can be reimplemented by a small team or even a single person, so there is more competition. This is not only demonstrated by Wirth's systems, but also by several 7th edition Unix clones of the 80's [1-4] as well as current ones [5] and also reimplementations of the classic MacOS [6].

Back in the 1980s, operating systems and compilers were often seen as the most complex pieces of software. Nowadays, web browsers include (and reimplement) large parts of an OS and compiler and are probably even more complex than a current OS such as Linux or a current compiler such as clang/LLVM. Only rich (or well funded) companies such as Google, Apple and the Mozilla foundation can afford to build a browser today that can be used to access current web pages.

So a central question is if we can turn back times and make software more simple again. Maybe this ship has already sailed - but it can't hurt to try. From experience with my students, it is extremely satisfying for them to build a complete system from scratch instead of mostly copying and pasting library calls or StackOverflow code snippets. Thus, I try to enable my students to experience this sense of achievement. They will probably never get the chance to do something similar in their later career in industry.

[1] One Man Unix for 68k - http://www.pix.net/mirrored/discordia.org.uk/~steve/omu.html

[2] Uzix for Z80 (link to the MSX port) - http://uzix.sourceforge.net

[3] Coherent Unix - https://en.wikipedia.org/wiki/Coherent_(operating_system)

[4] Minix - https://www.minix3.org

[5] Alan Cox' Fuzix - https://github.com/EtchedPixels/FUZIX

[6] Ardi Executor - https://en.wikipedia.org/wiki/Executor_(software)

How about FUZIX? It might be a better fit for vintage computers?

https://github.com/EtchedPixels/FUZIX

Also fuzix: https://github.com/EtchedPixels/FUZIX

Fan control generally involves hysteresis. This means a cooling fan turns on at one temperature, and then turns off once temperature has fallen to another lower temperature. This avoids cycling the fan on and off too much. The difference between those two temperatures is hysteresis. The default hysteresis is 10°C and maybe the fan never manages to cool the CPU to 45°C. A parameter has been added to change hysteresis: https://github.com/raspberrypi/linux/commit/fa390133fd17f2cc6aa5a7d2e472c073a1115fe1

I see that the PR against the Raspberry Pi linux repo is out [0]. Interestingly they are introducing a BCM2712 defconfig with a 64k default page size.

[0] - https://github.com/raspberrypi/linux/pull/5618

and can grab their patched kernel source here ( use the dtbs and overlays and kernel from your compiled version)

Also was your pi issue related to this? https://github.com/raspberrypi/linux/issues/3381 or what do you mean jittery, unstable?

Could be related to the driver load order/blacklisting (https://github.com/raspberrypi/linux/issues/435) Or couple of people report configuring the dtoverlay=imx477 in the boot config helped (https://raw.githubusercontent.com/raspberrypi/firmware/master/boot/overlays/README)

thanks, I also found this: https://github.com/raspberrypi/linux/issues/5398

And ready! :)

> It is the most basic task for Linux computer...

Well, it depends for whom. Also, you need adequate software and hardware. About wireless, the chipset in an RPi4 is designed for clients, not APs, and its capabilities on having multiple clients are quite limited:

https://github.com/raspberrypi/linux/issues/3010

Routers like the Omnia Turris, Mikrotik, PC Engines... use specific mini PCIe cards that can be as expensive as a full Raspberry Pi 4, just for the wireless.

https://www.discomp.eu/wireless-minipci-cards_c14501412.html