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zapper

Member

Registered: 2017-05-29

Posts: 856  

Questions about ARM

this is not about devuan builds, but I wondered, x86 has a bios underneath the installed operating system, what does ARM have underneath the installed operating system?

I have been wondering if it has something like a bios where you can disable certain features.

Like for example, I don't like bluetooth because its a massive waste of electricity and its supposedly bad for the environment.

Anyone know?

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Freedom is never more than one generation away from extinction. Feelings are not facts
If you wish to be humbled, try to exalt yourself long term  If you wish to be exalted, try to humble yourself long term
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stargate-sg1-cheyenne-mtn

Member

Registered: 2023-11-27

Posts: 76  

Re: Questions about ARM

this is a few years old but still very thought-provoking:

ttps://hackaday.com/2020/08/12/degrees-of-freedom-booting-arm-processors/

enjoy

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zapper

Member

Registered: 2017-05-29

Posts: 856  

Re: Questions about ARM

@stargate-sg1-cheyenne-mtn

Hmm... not so simple then

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Freedom is never more than one generation away from extinction. Feelings are not facts
If you wish to be humbled, try to exalt yourself long term  If you wish to be exalted, try to humble yourself long term
Favourite operating systems: Hyperbola Devuan OpenBSD
Peace Be With us All!

stargate-sg1-cheyenne-mtn

Member

Registered: 2023-11-27

Posts: 76  

Re: Questions about ARM

you might enjoy this presentation:

Nezha RISC-V Linux SBC running debian - via - ExplainingComputers
ttps://www.youtube.com/watch?v=613yEF6SrNo

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Be Excellent to each other and Party On!
ttps://www.youtube.com/watch?v=rph_1DODXDU
ttps://en.wikipedia.org/wiki/Bill_%26_Ted%27s_Excellent_Adventure
Do unto others as you would have them do instantaneously back to you

siva

Member

Registered: 2018-01-25

Posts: 278  

Re: Questions about ARM

https://developer.arm.com/documentation … ting-Linux

When the kernel is present in memory, the sequence on an ARM processor based system is similar to what might happen on a desktop computer. However, the bootloading process can be very different, as ARM processor based phones or more deeply embedded devices can lack a hard drive or PC-like BIOS.

Typically, what happens when you power the system on is that hardware specific boot code runs from flash or ROM. This code initializes the system, including any necessary hardware peripheral code and then launches the bootloader (for example U-Boot). This initializes main memory and copies the compressed Linux kernel image into main memory (from a flash device, memory on a board, MMC, host PC or elsewhere). The bootloader passes certain initialization parameters to the kernel. The Linux kernel then decompresses itself and initializes its data structures and running user processes, before starting the command shell environment. Let's take a more detailed look at each of those processes.

Maybe you could adjust your bootloader settings to achieve whatever goal you're looking for?

Also a good thread: https://www.reddit.com/r/arm/comments/9 … nd_a_bios/

You might also enjoy this book: https://www.wiley.com/en-us/Blue+Fox%3A … 1119745303

Last edited by siva (2024-03-15 13:48:51)

zapper

Member

Registered: 2017-05-29

Posts: 856  

Re: Questions about ARM

@siva I guess I could do that, not sure how, but its worth a try.

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Freedom is never more than one generation away from extinction. Feelings are not facts
If you wish to be humbled, try to exalt yourself long term  If you wish to be exalted, try to humble yourself long term
Favourite operating systems: Hyperbola Devuan OpenBSD
Peace Be With us All!