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.