# rOSka

Compile with `fasm boot.asm`

## Reguirements

Pentium or newer should have all the bells and whistles needed.

In case you want all the details:
- 32bit 80386 or newer CPU
- VGA compatible graphics adapter
  (640x480 graphics mode with 16 colours and a text mode)
- BIOS (or CSM, can't take anything granted these days...)
- RAM as I'm sure I'll just yank hard coded assumptions here and there
  Like 1MB should be enough for now
- Hard disk access requires extended BIOS support (i486 CPU?)
  Youknow, we support big disk like here in modern times.
- Floppies can't usually be accessed with extended calls, too bad.
  As a workaround get USB or something and chainload with PLOP bootmgr
  if direct USB boot is unavailable. Might make a floppy image at some
  point.


## Preparing a bootable disk

- We use standard MBR, even on a floppy. Eat shit MSLosdows.
- We use partition 1 as our partition. This is ext2. Again, deal with it.

So make a new partition table, partition it, and format it on Lunix.
Or Losdows, but there you're on your own!

!!! WARNING
    This will wipe the entire drive
    Replace /dev/sdX accordingly and triplecheck

```
sudo parted -s /dev/sdX mklabel msdos
sudo parted -s /dev/sdX mkpart primary ext2 0 100% --align cylinder
sudo mkfs.ext2 -L rOSka /dev/sdX1
```

Now put the thinking part to the MBR preserving partitiontable
```
sudo dd bs=1 count=446 if=boot.bin of=/dev/sdX conv=notrunc
```

And wow, you have a disk with a filesystem that boots the fancy loader


```
TODO: set bootable flag in fdisk and use VBR instead of MBR?
```