NOS kernel not loading, oddly enough...

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nkeck72

Joined: 28 May 2015
Posts: 83
Location: 0000:7C00

nkeck72 12 Jul 2015, 02:03

I am having issues loading the kernel for my OS. You can find a .tar.gz file for it here:

https://sourceforge.net/p/nosanopensourcefasmos/code/ci/master/tree/NOS-1.0.4.tar.gz?format=raw

The error occurs when loading the Filesystem Block, or FSB, into RAM. the MBR code then tries to read the kernel location from that block. It ends up getting the wrong data from the block when it is in RAM, but idk why. If you guys will try this on your own, and tell me if you have any issues.

My only clue to the error is that Bochs, what I am using to test my OS, when I load the CHS value for the location of the kernel on the disk from RAM, says in the status window:

Quote:

[BIOS]: INT 13 read/write/verify: parameter out of range; returning fail.

With my luck it is something simple I am overlooking. Smile

_________________
It may look hard, but it won't take long if you take it one byte at a time.

NOS: www.github.com/nkeck720/nos

12 Jul 2015, 02:03

Mike Gonta

Joined: 26 Dec 2010
Posts: 243

Mike Gonta 12 Jul 2015, 08:52

nkeck72 wrote:

The error occurs when loading the Filesystem Block, or FSB, into RAM. the MBR code then tries to read the
kernel location from that block. It ends up getting the wrong data from the block when it is in RAM, but idk why.

myos.asm wrote:

Code:

kernel_load:
        ;; Load the filesystem into RAM
        mov ah, 02h
        mov al, 01h
        mov ch, 00h
        mov dh, 00h
        mov cl, 01h

Sector numbering starts at 1.

_________________
Mike Gonta
look and see - many look but few see

https://mikegonta.com

12 Jul 2015, 08:52

nkeck72

Joined: 28 May 2015
Posts: 83
Location: 0000:7C00

nkeck72 12 Jul 2015, 15:25

Comment Removed.

_________________
It may look hard, but it won't take long if you take it one byte at a time.

NOS: www.github.com/nkeck720/nos

12 Jul 2015, 15:25

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