[LinuxBIOS] USB floppy boot

Peter Stuge peter at stuge.se
Sun Dec 9 15:44:13 CET 2007


On Sun, Dec 09, 2007 at 12:26:21AM -0800, Baski wrote:
> I have a tiny kernel (not linux) and GRUB in a floppy disk. How can
> I make it to boot using linuxbios?

A few things need to be considered:

* How does the kernel try to find the system information that is
  usually exported by the BIOS in quite old-fashioned ways?
  At a minimum, the kernel needs to know how much memory is in the
  system. LB does not offer the same methods as a BIOS to learn this.

* Does the kernel use other BIOS interrupt services? LB does not
  offer any.

* How large is your kernel?
  If it can fit with LB in the boot flash (which is between 256kb and
  1MB) you don't need the floppy at all.

* Is the floppy a requirement?
  Currently no other payload than a full kernel (Linux or other) with
  it's own floppy drivers can read from the floppy drive.


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