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

[Michal Simek <monstr@xxxxxxxxx>]

> On Tue, August 19, 2008 01:34, John Williams wrote:
>> 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.
> 
> Is this to say that it's for ever impossible, or just currently a not supported
> option for debugging for the petalinux/microblaze combo? The reason why I stress
> this question is I still can achieve this by support from the Altera/Nios uClinux
> community when understanding how they did make it work on that softcore?

Hi Olof.
Microblaze is FPGA soft core (only VHDL), and kernel is only program. Almost
everything is possible that's why are FPGA great.

Michal
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