MBR loader

Simple MBR

This is a code to define an MBR in FASM.

You can install all the MBR (boot.bin) or you could only install the code of the MBR into your drive:

[root@host]# dd if=boot.bin of=/dev/sdaX bs=436 count=1 conv=notrunc

This order doesn't erases the partition table.

The process of the MBR code is the following:

Set up registers and a stack
Rellocate itself to the address 0x000:0x0600
Search for the first active partition
Load the first sector of the first active partition (the VBR) into 0x0000:0x7c00
Check if the data has the executable flag (0xaa55)
Jump to the VBR code

You could also write manually the partition table and assemble the code again, with the proper partition table.