I am trying to make small kernel. I have written many programs and produce many .bin and .o files but what I want that to load every file from a specific location in specific sectors but don't know how to do that in linux , in dos same can be done by debug command.

If It is not possible to achieve the specific location criterion please tell me how can I just copy many files serially to a floppy image.

I have another question that if files are copied in floppy. How could I know in which sector the file has been loaded in floppy so that I can retrieve them by BIOS interrupt INT13.

Thanks in advance.............

waiting for response.......

You are not understanding the concepts of filesystems:http://www.google.com/search?q=fat12...ient=firefox-a
I actually designed my own filesystem for my kernel/os!

1 members found this post helpful.

You can use the dd command to place arbitrary data at arbitrary locations on any writable block device. There is a LQ thread that explains everything you ever wanted to know about dd and more.

The directory entry for each file in a FAT filesystem contains a pointer to the first block of data in the file. You can interpret the directory entry accordingly to locate the file data. Of course, this is what an OS already does...

--- rod.

Thank you @smeezekitty for your reply I am eager to know what file system you are using for that but again please guide me about the boot loader.What you had used grub or something of your own and do you compile everything in binary format.

Please don't get angry if my questions are stupid. Actually I become confused. It will be great if you can give me a good link which has something more than just to write Hello world boot loader.If you have any written by yourself that would be best....

-Joy-

The post is really helpful. I think I can now do it.. testing.....


Reading about it.. can you suggest any tutorial

I have no particular favorite, but a Google search for 'fat file system tutorial' yielded a plethora of promising hits. I'm sure if you have access to any old books on MS-DOS internals, you can find some good information. I know of books by Peter Norton and Ray Duncan that probably explain FAT filesystems fairly well. Note that there are a few different flavors for different media sizes (FAT-12, FAT-16, FAT-32...)

--- rod.

I used a modified boot loader from TheNbomr.
Go look at the source code for the kernel from the link on my sig, notably the bootloader and startup code.

BTW What ever you do, do not go on the osdev.org forums or you will get flamed and the thread be locked just for asking a stupid questions.