bennett78@digis.net wrote: 
Quoting "David H. Lynch Jr." <dhlii@dlasys.net>:

  
    Has anyone not covered by non-disclosure deciphered the JTAG codes
for the PowerPC ?
    

Is this a big secret or just skimpy Freescale documentation?
Try emailing:
     Ed.Nuckolls@freescale.com
This effort could help expand projects such as:
      http://sourceforge.net/projects/jtager/
for us embedded powerpc users!

For myself, right now I can't get much help from Abatron turning
on a new MPC5200 design. My approach: debugging modified u-boot code 
running out of RAM....lots of machine checks!

    It is my understanding that certain aspects of JTAG are specific to the target (chip) for most devices that information is documented.
    Some processors treat the JTAG communications to the processor as proprietary.
     Some make the information readily available.

    It is my understanding that the interface to the PPC is only available under NDA from IBM.

    My client is building a wholely OpenSource SDK to support developing for their target.
    They have their own pseudo JTAG interface - on the host side it emulates a JTAG Parallel port in software.
    On the target side it is a full hardware JTAG.
    They are trying to get a gdbserver working and there is no OpenSource GdbServer that includes PPC support.

    Right now they have a back burner project decyphering the the PPC interface and are working through it slowly.


Frank Bennett
President
Mathegraphics,LLC
Fort Collins,CO 
www.mathegraphics.com
bennett78@digis.net


  
   
    I have a situation using a custom JTAG interface that is looking to
impliment host side PPC debugging. JTAG access and manipulation of most
all other JTAG devices on the target is working.
    Right now the problem is deciphering the JTAG commands etc to the
PPC itself.



Ria Roy wrote:
    
Hi, 

Does anyone know if Macriagor's mpDemon is capable of debugging the
linux kernel via the JTAG interface. 

Thanks in advance, 
Ria

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-- 
Dave Lynch 					  	    DLA Systems
Software Development:  				         Embedded Linux
717.627.3770 	       dhlii@dlasys.net 	  http://www.dlasys.net
fax: 1.253.369.9244 			           Cell: 1.717.587.7774
Over 25 years' experience in platforms, languages, and technologies too
numerous to list.

"Any intelligent fool can make things bigger and more complex... It takes a
touch of genius - and a lot of courage to move in the opposite direction."
Albert Einstein

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-- 
Dave Lynch 					  	    DLA Systems
Software Development:  				         Embedded Linux
717.627.3770 	       dhlii@dlasys.net 	  http://www.dlasys.net
fax: 1.253.369.9244 			           Cell: 1.717.587.7774
Over 25 years' experience in platforms, languages, and technologies too numerous to list.

"Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction."
Albert Einstein