Re: [microblaze-uclinux] Source level debug over JTAG (ie. not ethernet) for applications

[John Williams <jwilliams@xxxxxxxxxxxxxx>]

Hi Olof,
Olof Backing wrote:
> On Wed, July 30, 2008 11:10, Olof Backing wrote:

> > I have a running kernel and wants to debug applications running on the target. Since
> > we only have a JTAG connection I'd like to skip the kernel download every time and
> > just download the application. I have read old postings about debugging u-boot and
> > so, but this scenario differs a bit.
> >
> > I have been reading all the documentation on Petalogix developer website about
> > debugging. Sadly we don't have en ethernet port on our microblaze processor node -
> > but we have a JTAG... :)
> > I can connect the the microblaze over the JTAG connection from the host side and
> > also start microblaze-uclinux-gdb for remote target connection to localhost:1234.
> > But what about the target side? Usually the gdbserver connects over the ethernet
> > port but I have to stick with the JTAG port.
> > I have succesfully done this with Altera Nios II and "debug" on the target side but
> > with the microblaze I must do something else - but what?
>
> This just struck me:
>
> Is it possible to use the debug application (found for instance in the nios2
> uclinux) to achieve user application debugging? Or is the kernel lacking some
> important stuff that will make this solution impossible?

There is no direct support for using JTAG to debug userapplications, 
however gdbserver / mb-uclinuc-gdb can work over a serial port.  In 
principal you could debug over the MDM-uart.  I seem to recall this was 
discussed previously on the list, see what the archives have to say.

Regards,

John

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