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 Current Problem: El Torito & BrokenThorn 
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Joined: Sat Jul 25, 2009 6:10 am
Posts: 112
Location: United Kingdom
Post Current Problem: El Torito & BrokenThorn
OK, so I was following the tutorial here, which worked fine, until it came to loading the kernel. Mike uses a Floppy driver to do this, so of course it won't work on my ISO. Anyone know how to get from bootloader to code in C? Most of the tutorials I found load the kernel at the 1MB mark (0x1000), however, my problem is that my bootloader is loading the code at the 8MB mark (0x800) :o so if anyone has got ideas... handy...

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Michael Sammels

OS Developing is 10% luck, 20% skill, 15% concentrated power of will. 5% pleasure, 50% pain, and a 100% reason continue the game.


Sat Mar 27, 2010 12:19 pm
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Joined: Tue Jan 19, 2010 11:51 pm
Posts: 66
Post Re: Current Problem: El Torito & BrokenThorn
You seem too confused to attempt this!

0x100000 is one meg
0x800000 is eight meg

You need a CD-ROM boot loader. You place that in about block 22 in the ISO. Block 20 is something, 21 another thing, and I think about 22 is the boot loader.

Here is my CD-ROM boot loader:
http://www.losethos.com/code/BootCD.html
My boot loader must be patched. That's done in here:
http://www.losethos.com/code/InsBoot.html

Here is my file which makes an ISO image:
http://www.losethos.com/code/DiskCDDVD.html

The operating system starts-up when the boot loader does a jmp.
http://www.losethos.com/code/OSStartUp.html

I think you're in over your head.


Sat Mar 27, 2010 6:31 pm
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