[OpenBIOS] Starting linux aint much easy ?

[Attarian, Gary]

Oops, this was my bad.  after looking back at your previous posts, Jörg, I
think Ronald is correct.  Which brings me back to an earlier question.
Namely are you loading a zImage or a bzImage?  If you carefully look through
the head.S code, you will notice it deciding whether the kernel is loaded
high or low.  I believe it does this by checking a value generated at
compile time.  Anyway, my understanding is that the big (bzImage) kernels
are loaded high 0x101000 and the smaller (zImage) kernels are loaded into
low memory  at 0x1000.  

Assuming OpenBIOS puts the processor into protected mode with a 4g address
space (a good bet as Ronald has already confirmed this), all you should have
to do is jump to the kernel.  If you already have access to the 4g address
space while you are loading the kernel from flash this should be the case.

One last question though, did you say you were loading a vmlinux image
(uncompressed) into memory?  If so, head.S assumes the image is compressed
and trys to uncompress it.  
	Gary

> -----Original Message-----
> From:	Ronald G. Minnich [SMTP:rminnich at lanl.gov]
> Sent:	Tuesday, February 15, 2000 12:56 PM
> To:	openbios at elvis.informatik.uni-freiburg.de
> Subject:	Re: [OpenBIOS] Starting linux aint much easy ?
> 
> I don't think you should fall back into real mode. There's no good reason
> to. I think you should look at how LOBOS does its thing, which is to boot
> linux entirely in protected mode, and emulate that in your bios.
> 
> Falling into real mode is a mess. Also, once you drop to real mode, you
> can't address 0x100000 any more. This is probably not what you want, since
> your code is at 0x101000. 
> 
> ron
> 
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