How does the OS boot OS

[Shubhangi Jadhav]

Hi,

I'm trying to understand the working of LinuxBIOS. The FAQ says that it
uses a real OS is used to load the OS. Can someone elaborate on this ?
    Is it that the kernel image  which you burn along with linuxbios on the
BIOS Flash ROM is copied to RAM, performs the hardware initialization and
then it invokes the other OS which in my case would be linux? How is the
other OS invoked ?

Thanks,
Shubhangi

[ron minnich]

On Fri, 11 Apr 2003, Shubhangi Jadhav wrote:
> Is it that the kernel image  which you burn along with linuxbios on the
> BIOS Flash ROM is copied to RAM, performs the hardware initialization and
> then it invokes the other OS which in my case would be linux? How is the
> other OS invoked ?

that is pretty much how it works. Here at LANL we use a system call two 
kernel monte; do a google on it.

ron

[Steve Gehlbach]

ron minnich wrote:
> that is pretty much how it works. Here at LANL we use a system call two 
> kernel monte; do a google on it.

Does monte work on 2.4?  What about kexec for 2.4?

-Steve

[ron minnich]

On Fri, 11 Apr 2003, Steve Gehlbach wrote:
> Does monte work on 2.4?  What about kexec for 2.4?

both work on 2.4, and kexec works on 2.5

ron

[Steve Gehlbach]

ron minnich wrote:
> On Fri, 11 Apr 2003, Steve Gehlbach wrote:
> > Does monte work on 2.4?  What about kexec for 2.4?
>
> both work on 2.4, and kexec works on 2.5

I must be getting the wrong files or something.  The last time I looked 
at kmonte the docs said 2.2 and 2.3 only, and I could not get it to 
compile under 2.4.  And kexec, I could only find the files for 2.5. 
Maybe you can help me find the right locations.

This is where I was getting kmonte:
http://www.scyld.com/products/beowulf/software/monte.html

[ron minnich]

On Fri, 11 Apr 2003, Steve Gehlbach wrote:
> This is where I was getting kmonte:
> http://www.scyld.com/products/beowulf/software/monte.html

The Scyld stuff is for older Linux kernels; you need to go to the
sourceforge and look for beoboot and bproc, etc.

ron

[Steve Gehlbach]

ron minnich wrote:
> The Scyld stuff is for older Linux kernels; you need to go to the
> sourceforge and look for beoboot and bproc, etc.

Thanks, I didn't see it in beowulf, but I did find 
http://sourceforge.net/projects/monte/, and did a "cvs co" of monte, and 
built it and insmod'd it on 2.4, and all seems well, though I haven't 
actually executed it yet.

Thanks for the hints; it's too bad that the scyld stuff comes up on 
google first, I looked to use this a year ago on 2.4 and gave up 
assuming it only worked on 2.2.  Kind of cryptic to find the right 
files; the monte project says production stable, but no files released.

Someone needs to put a note on scyld.

-Steve

[Andrew Ip]

> both work on 2.4, and kexec works on 2.5

I have backported kexec to 2.4.19, and 2.4.20 can use this patch also.
Although it isn't the lastest, it works ok.  I have tried to port the
latest to 2.4, but it requires much more work than I expect.  It
is what I have so far.

-Andrew

[Gregg C Levine]

Hello again from Gregg C Levine
I might as well chime in on this discussion right here. 
Andrew are you certain that your patch for the 2.4.19 kernel for the
kernel exec function can be applied to the 2.4.20 kernel? Granted I
should think it would work, with out too much fuss, except from patch
itself, but I'm not an expert.

And more importantly, the make elf image tool, normally requires as
one of its parameters, a ram disk. Any suggestions for building one?

Does your LinuxBIOS SDK have anything to offer for this one, Andrew?
-------------------
Gregg C Levine [e-mail]
------------------------------------------------------------
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> -----Original Message-----
> From: [e-mail] [mailto:linuxbios-
> [e-mail]] On Behalf Of Andrew Ip
> Sent: Friday, April 11, 2003 10:00 PM
> To: ron minnich
> Cc: Steve Gehlbach; Shubhangi Jadhav; [e-mail]
> Subject: Re: How does the OS boot OS
> > both work on 2.4, and kexec works on 2.5
>
> I have backported kexec to 2.4.19, and 2.4.20 can use this patch

also.
> Although it isn't the lastest, it works ok.  I have tried to port

the
> latest to 2.4, but it requires much more work than I expect.  It
> is what I have so far.
>
> -Andrew
>
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