Re: Regarding the booting the linux kernel on a > PPC board.

[Clemens Koller <clemens.koller@anagramm.de>]

Hi, Vinay!

You might want to turn on kernel debugging and also the
early printk support.

You also might want to come over to the linuxppc-embedded
and linuxppc-dev mailinglists at ozlabs.org where those question
are pretty well known. Tell us more about your board/system,
check the archives!

Greets,

Clemens Koller
_______________________________
R&D Imaging Devices
Anagramm GmbH
Rupert-Mayer-Str. 45/1
81379 Muenchen
Germany

http://www.anagramm.de
Phone: +49-89-741518-50
Fax: +49-89-741518-19

vinay hegde wrote:
>>Hi All,
>> 
>>I am working on bringing up a PowerPC based board
>>with Linux 2.6 kernel (Board supoort package).
>>However, I am facing some problem with respect to
>>debugging.
>> 
>>When I boot the board with the Linux kernel (BSP),
>>the board hangs after printing the following
>>information.
>> 
>>
>>Network Loading from: /dev/enet0 
>>
>>Client IP Address      = 192.168.4.38 
>>Server IP Address      = 192.168.4.101 
>>Gateway IP Address     = 192.168.4.253 
>>Subnet IP Address Mask = 255.255.255.0 
>>Boot File Name         = developer.kdi 
>>Load Address           = 04000000 
>>Buffer Size = 2000000 
>>
>>Network Boot File Load Start - Press <ESC> to
>>Bypass, <SPC> to Continue 
>>
>>
>>Bytes Received =&6141952, Bytes Loaded =&6141952 
>>Bytes/Second   =&511829, Elapsed Time =12 Second(s) 
>>
>>Boot Device       =/dev/enet0 
>>Boot File         =developer.kdi 
>>Load Address      =04000000 
>>Load Size         =005DB800 
>>Execution Address =04000020 
>>Execution Offset  =00000020 
>>
>>Passing control to the loaded file/image. 
>>loaded at:     00800000 00DD8800 
>>zimage at:     008058E0 009933BB 
>>initrd at:     00998000 00DD8800 
>>avail ram:     00400000 00800000 
>>
>>Linux/PPC load: console=ttyS0,9600 console=tty0
>>root=/dev/sda2 
>>console=ttyS0,9600 root=/dev/ram rw 
>>Uncompressing Linux...done. 
>>Now booting the kernel 
>>
>>
>>
>>>>>>>>>>>>>>>>>>>>>>>. 
>>
>>I am going through the source code to figure out the
>>problem, but unable to find out what is going wrong
>>here.
>>
>>Does anybody have any idea about the problem? Also,
>>is it possible to print some debug messages at this
>>point of booting? {Note that, in the early stage of
>>booting process the serial is initialized and all
>>the above mentioned messages (like Uncomressing
>>Linux, Now booting the kernel etc) are printed. And
>>immediately after printing the "now booting the
>>kernel message,the serial is closed. This code is in
>>uncompress_kernel() function in
>>arch/ppc/boot/simple/misc.c file).
>>
>>Can somebody help me with the above problem?
>>
>>Thank you,
>>
>>vinay hegde.
>>
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