Building an Operating System for the Raspberry Pi

Re:Building an Operating System for the Raspberry Pi by DSMan195276 on Thursday January 18, 2018 @05:19PM (#16182095)

Very nice! I've been considering attempting to port an OS that I've been writing to an ARM device like the Pi, but I've never really looked into it much. With that said, I'm surprised the booting portion is so easy, I was under the impression that for the Raspberry Pi (And ARM devices in general) it was more complex. I suppose though, this is started after the bootloader that's normally on the SD card correct? I would imagine that makes things a fair bit simpler if that's the case, since the bootloader would take care of all the secret sauce.

Do you have plans to implement paging eventually?

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Re:Building an Operating System for the Raspberry Pi by bpye on Thursday January 18, 2018 @11:28PM (#16184153)

Yep the proprietary bootloader on the Raspberry Pi handles most initialisation leaving the SoC in a usable state. If you want to see how things like DRAM init work you can take a look at the open source reverse engineered firmware at https://github.com/christinaa/rpi-open-firmware . It isn't complete but it is just about enough to also boot the Linux kernel.

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Re:Building an Operating System for the Raspberry Pi by DSMan195276 on Saturday January 20, 2018 @10:08PM (#16196686)

Thanks for linking that, that is one impressive piece of work!

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Re:Building an Operating System for the Raspberry Pi by jsandler18 on Friday January 19, 2018 @12:33AM (#16184341)

I do plan to implement paging. I already manage all of the physical pages, I just haven't enabled the mmu yet as I wanted to get more fun features in first

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