Re: [Openocd-development] STM32 "reset halt" appears broken

[Øyvind H. <oyv...@zy...>]

On Fri, Apr 24, 2009 at 12:21 AM, Magnus Lundin <lu...@ml...> wrote:
> Ųyvind Harboe wrote:
>>>
>>> resetting first
>>> the jtag, and this rsets my target also, and then a little later
>>> resetting the Cortex core giving two rests in quick succeion. It works
>>> but I dont like it. For my old LM2S811 reset does not work well, but I
>>> have not had time to really dig in to this, just noticed the dual rsets
>>> and used the onboard reset button, works great all the time :) .
>>>
>>
>> Perhaps the target script or cortex should override the default
>> ocd_process_reset script.... i.e. by default resetting the entire
>> chain was considered a clever idea, but for cortex, it might not
>> be such a great thing...
>>
>>
>
> I dont think it is a Cortex issue, but as I understand it every reset does
> the following
>
> first calls  jtag_reset_init,
> generating  a sequence of trst/srst on the jtag interface
> and then revalidating the scanchain, a VERY good idea.
>
> But then the target reset code is called,  sending the same, almost,
> sequence of trst/srst
> and not revalidating the scanchain.
>
> Am I missing something ?

That's about it.

But all this can be configured in the target configuration scripts.

What *should* be done for Cortex-M3 then?

>
> Regards,
> Magnus
>
>
>



-- 
Øyvind Harboe
Embedded software and hardware consulting services
http://consulting.zylin.com