= INFO

The purpose of this project is to learn how original Linux kernel (0.01) was implemented.
That would be great to understand kernel internal.
Most of code was extracted from source code of Linux kernel 0.01 and rebuilt to run on a simulator. 


= TODO

1. Learn how to create a floppy image file formatted as FAT12 (or whatever file system) on Linux
   - the boot loader & kernel will all stay on this floppy image

   ===
   - tools:
     + mkdosfs
     + dd: Linux command for copy and convert a file 
     
   - ref:
     + man mkdosfs
     + http://wiki.osdev.org/Loopback_Device
     + http://www.dedoimedo.com/computers/grub.html (how to copy stage1 & stage2 boot loader to floppy.img)

   ===
   - create the floppy.img file using dd:
     $ dd if=/dev/zero of=floppy.img bs=512 count=2880
   - format floppy.img as FAT12
     $ sudo mkdosfs -F12 floppy.img

2. Copy 2-stage bootloader to correct places on floppy.img
     $ dd if=stage1 of=floppy.img count=1
     $ dd if=stage2 of=floppy.img seek=1

3. Write a simple Makefile to compile and build bootloader
   
4. Build a 2-stage bootloader
   - stage 1 binary is recorded on boot sector (first 512 bytes) of floppy image
   - stage 2 binary is recorded as a file on floppy image and is loaded into memory by stage 1
   - kernel will then be loaded by stage 2
   
5. Write the kernel 


= TOOLS
  dd
  hexdump
  objdump
  od
  mkdosfs
  ld
  gcc
  

= NOTES

== Make
   - rule
     target: prerequisites
           commands
   - make with no arguments executes the first rule in the file
   - there must be a tab at the beginning of any commands