You included stuff at the top of your bootloader, where it will executes first. Instead include extra functions where they aren’t in the main path of execution and are only reached by call. This should work, placing the %include directives where it’s safe to put extra function or data, just like if you were writing … Read more
LBA Disk Access Availability Not all BIOSes support the extended disk read and write functions (although on modern hardware they almost all likely will). Not all BIOSes support extended disk reads of floppies via Int 13h/AH=42h. This is true of BOCHS as well. You can test whether extended disk functions are available on a drive … Read more
If you are on Linux you can do it with DD utility. There is a version of DD for Microsoft Windows as well. General DD usage If you wish to make a zero filled virtual disk image the size of a 720K floppy you can use dd like this: dd if=/dev/zero of=disk.img bs=1024 count=720 This … Read more
On x86 you would do the following (simplified): Have the bootloader load the n-th sector of the disk/floppy (wherever you’re booting from) into memory and execute it (i.e. load segment/offset and do retf). A better alternative is to search the filesystem for a certain filename (e.g. KERNEL.BIN) — but you’d need to know the file … Read more
Answer recommended by Intel