Re: Raw loader for diskless GRUB

[Christoph Plattner]

The nbiloader.S already does this job. The etherboot/netboot stuff also
only can load not below 0x10000 and so the loader includes a routine,
copy
the diskless code down to 0x8200.

But you have to check the protocol of the loading itself. nbiloader.S
uses
the netboot protocol used by etherboot and netboot stuff. BOOTP/TFTP is
not all
of the downloading. Also other points are important:
        * where is the image loaded
        * can it be loaded at once or in blocks
        * which address is called (entry point of execution)
        :
        and so on.

If (only if so) the loader expects an image of one block, loaded at
0x10000 and
with an entry point of 0x10000 then you have a chance by changing the
nbiloader.S
file (removing the first 32bytes of the data table and set there a jump
to the
address offset 32 bytes. Then it could be possible to load the `nbgrub'
file.
But of course this is a `hack' (trial version).

With friendly regards

        Christoph Plattner


Florian Weimer wrote:
> 
> I've got a NIC (3com 3c905c TX-M) which supports BOOTP and can load
> images up to a certain size (~450 KB) via TFTP.  Unfortunately, the
> image is stored at address 0x10000 and onwards, so I couldn't any of
> the existing boot loaders, and couldn't load the 'diskless' image
> directly.  In order to solve this problem, I've written a small loader
> which copies the 'diskless' image to adress 0x8200 regardless of its
> initial location.
> 
> If you're interested, I'll clean up the code and you can have it.
> 
> _______________________________________________
> Bug-grub mailing list
> address@hidden
> http://mail.gnu.org/mailman/listinfo/bug-grub

-- 
-------------------------------------------------------------------------
private:        address@hidden
company:        address@hidden