How to go about writing an OS and bootloader to disk?

[chronium]

Hello everyone.

So, after I get myself an ATA driver or something to be able to read and and write to and from the disk, how exactly do I go about writing things like the MBR, a bootloader and my kernel to the disk?
The bootloader I'm aiming for is GRUB2, on normal BIOS.
I do not exactly understand how they all fit together, what needs to get written where, things like that.
And another question, is there a way for me to write a GRUB2 module for my own file system?

Cheers,
Chronium.

[dozniak]

Hello everyone.

So, after I get myself an ATA driver or something to be able to read and and write to and from the disk, how exactly do I go about writing things like the MBR, a bootloader and my kernel to the disk?

grub-install does grub installation for you, just give it a drive specification (hd0) etc - see GRUB manual for that, it's all detailed there.

I do not exactly understand how they all fit together, what needs to get written where, things like that.

If you're using grub, you can write the kernel anywhere on a fileystem that is understood by grub.

And another question, is there a way for me to write a GRUB2 module for my own file system?

Yes, it is possible. Get grub sources https://www.gnu.org/software/grub/grub-download.html and look for implementation of filesystem modules, it's fairly straightforward. E.g. grub-core/fs/fat.c defines a FAT filesystem driver.

[chronium]

I don't want to install it using external tools. I'm interested on how to do the installation from inside my kernel. There should be a way to get the stage 1 and 2 files, write the stage 1 where it should be and then do the rest for stage 2, but that's what I don't quite get how to do.

Where exactly each part of the bootloader should go

[Geri]

the first ,,stage'' goes to the first sector.

the second goes

[dozniak]

Where exactly each part of the bootloader should go

You can inspect the sources of grub-install and figure where, how and why it is written.

Learn to read already.