RE: [microblaze-uclinux] JTAG as UART for PowerPC

["Vasanth Asokan" <vasanth.asokan@xxxxxxxxxx>]

You can use the opb_mdm as a JTAG UART even in PPC systems. The UART
functionality is done over OPB. 

For an example system, you can see XAPP996 (Dual processor Reference
design suite)
http://www.xilinx.com/bvdocs/appnotes/xapp996.pdf
http://www.xilinx.com/bvdocs/appnotes/xapp996.zip

All the designs use OPB_MDM based JTAG UART as a 2nd UART in the system.
You need to connect appropriately in XMD. Check xmd.ini in each project
for the commands to do this.

Thanks,
Vasanth


> -----Original Message-----
> From: owner-microblaze-uclinux@xxxxxxxxxxxxxx
[mailto:owner-microblaze-
> uclinux@xxxxxxxxxxxxxx] On Behalf Of John Williams
> Sent: Thursday, June 07, 2007 3:34 PM
> To: microblaze-uclinux@xxxxxxxxxxxxxx
> Subject: Re: [microblaze-uclinux] JTAG as UART for PowerPC
> 
> Hi,
> 
> pantgom@xxxxxxx wrote:
> > Hi, I have seen that it is possible to configure opb_mdm in
microblaze
> for
> > Console Uart, but what about PowerPC?
> >
> 
> I don't think so.
> 
> > I have added opb_mdm to my system, but I get an error saying that
this
> > component is not accessible by PowerPC.
> 
> opb_mbm takes directly to the microblaze HW debug/trace signal
> interface, which is completely different to the powerpc's.
> 
> That said, check the EST_RM.pdf document (embedded system tools) that
> comes with EDK, in the chapter on XMD it may mention how to to a JTAG
> UART-style functionality with the powerpc.  Whether it will be
possible
> to fake that up as a linux console driver is another matter, however.
> 
> Regards,
> 
> John
> 
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