On 11/09/2020 12:56, Jim Jackson wrote:
> On 2020-09-10, The Natural Philosopher  wrote:
>>
>> Looking at my 'I only do one thing' Pi running 94 different processes,
>> realistically how many of them do I need? And how could I get rid of them?
>>
>> I want to examine the pi as a reasonably real-time signal processing unit.
>>
>> I don't need disk access except to load the code. I may not need network
>> access. I don't need logging. I sure don't need systemd. I don't need a
>> gui.
>>
>> I just want to run one high priority daemon and one lower priority
>> demon, with shared memory between them...is there something simpler than
>> Linux? More like e.g. DOS?
>>
>
> You can start what you want. Linux is just the kernel. Alter the
> cmdline.txt to tell the kernel what program to start (init=...), instead
> of systemd or another init process.
>
> see
https://unix.stackexchange.com/questions/428347/how-to-pass-arguments-to-a-linu
x-kernel-init-bootparam
>
> Ok, your code that acts as init would have to start anything else you
> wanted, or set up networking etc. but it can be done. I'm pretty sure
> you could use busybox to form a minimal but adaptable boot environment.
>
> This maybe of use...
>
>
https://pixelspark.nl/2019/making-your-own-linux-distribution-for-the-raspberry
-pi-for-fun-and-profit-part-2
>
> All the parts are available from the standard Raspbian OS
>
Thank you. That is most useful.


--
There is something fascinating about science. One gets such wholesale
returns of conjecture out of such a trifling investment of fact.

Mark Twain

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