Re: Please help me...

Jeff Millar wrote:

The zimage arrives at 00200000 and you start it there.  I think it copies
itself to 00100000 but never looked. The idea is to position the zImage
in ram low enough to use the first 16M but above the uncompressed kernel and
its data structure ( from 0M and up)  Putting the zImage at 00200000 is
a good compromise.

In  my case, If I try to download zImage at 0x00200000, it will fail to
download.
I don't know why. but If I download zImage at 0x00100000, it will download
successfully but can not run... It is so strange. Can you share me with some of
your experience?
Thanks.

BTW, the zImage is relocatable and can be loaded anywhere.
I just learned to copy it to FLASH with a built in debugger
program and start it there.  This makes the board boot
automatically without the tftp download.

How can I copy it to Flash?

----- Original Message -----
From: "dony" <redacted>
To: "Jeff Millar" <redacted>; "linuxppc-embed"
[off-list ref]
Sent: Friday, December 31, 1999 3:37 AM
Subject: Re: Please help me...

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The zImage contains an uncompress program at the start.  This program

then

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copies and uncompresses the kernel to another location in ram.

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If your
using the kernel from Dan at

    ftp://linuxppc.cs.nmt.edu/pub/linuxppc/embedded/

Then use the debugger to start it at 0x00200000.  Refer to the code in
arch/ppc/mbxboot/misc.c

Yes, I use the mpc8xx.2.2.13.tgz to compile the kernel "zImage".
Do you mean that when I download the kernel "zImage" to RAM address

0x100000

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on our own board (but not mbxboard) , and jump to 0x100000, It will
automatically run the uncompress program to copy and decompress the kernel

to

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0x200000, then  jump to 0x200000, the decompressed kernel will boot,

right  ?

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I'm not the expert, Dan is, but he's been teaching me.

jeff
----- Original Message -----
From: "dony" <redacted>
To: "Raphael Bossek" <redacted>; "Brendan

Simon"

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[off-list ref]; "Dan Malek" [off-list ref]; "linuxppc-embed"
[off-list ref]
Sent: Thursday, December 30, 1999 9:29 PM
Subject: Please help me...

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Hi,
      Now I am trying to embed linux onto our MPC860-based board. I

have

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some questions which may be solved by you embed-linux gurus....
     What I want to do  is the following:
    1     Initialize the MPC860 CPU , memory, serial port, enet port .
    2    Download  the linux powerpc kernel (which I have

cross-compiled

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on my X86 box)
           from the TFTP server to RAM on board.
    3    run the kernel.
Now the 1 and 2 step work well, but when I download the kernel to RAM

on

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board, It just cannot run.Do you know why? How can I programme to make
it run? Since the kernel is a compressed image (zvmlinux), need I make
some codes to decompress it and then run it? if so, how to do it?
 Thank you very much :-))
 Merry christmas & happy year.

dony

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