Re: [OpenOCD-user] Openocd SWD flash with sysfs or gpiod is too long on Radxa Pi / AMLogic S905Y2

[Benjamin H. <zo...@gm...>]

Le jeu. 28 juil. 2022 à 16:14, Maximin COSTE <max...@gm...> a
écrit :

> Hi,
>
> >Sysfs is slow (and deprecated by the kernel guys), gpiod is way faster.
>
> Surprisingly, the flash duration is the same (+/1 sec) for gpiod and sysfs
> here !
>
> >I think there is a gpiod cable in openocd now, but i have not tested it
> yet.
>
> My apologies if this is a stupid but what is a "cable" in this context ?
> I use gpiod in my configuration file using the following adapter command:
> "adapter driver linuxgpiod"
>

Adapter sorry, cable is for urjtag :-)


> Best regards,
>
> --
> Maximin COSTE
>
>
> Le jeu. 28 juil. 2022 à 16:06, Benjamin Henrion <zo...@gm...> a
> écrit :
>
>> Le jeu. 28 juil. 2022 à 14:42, Maximin COSTE <max...@gm...> a
>> écrit :
>>
>>> Hi everybody,
>>>
>>> I was previously using openocd on a RPI Zero 1/2 to flash an STM32F412
>>> using SWD protocol.
>>> The whole flashing operation takes around 5 to 6 seconds which is fine.
>>> My only constraint is that operation takes no more than those 5 to 6
>>> seconds (it is
>>> because the STM32F4 sends keep-alive frames via CAN to the main battery.
>>> If there is
>>> no message received in the last ~7 sec, the battery shutdown and so does
>>> the entiere
>>> system).
>>>
>>> Due to the current shortage of RPI boards, I switched to Radxa Pi Zero
>>> (https://wiki.radxa.com/Zero) with an AMLogic S905Y2 inside.
>>> I have tried to use sysfs and gpiod (in my understanding, there are
>>> pretty much the
>>> same thing, and gpiod is newer ?) and despite thoses errors messages:
>>>
>>
>> Sysfs is slow (and deprecated by the kernel guys), gpiod is way faster.
>>
>>
>>> > Error: Translation from khz to adapter speed not implemented
>>> (maybe it is because of the use of such "generic" layer)
>>>
>>> > Error executing event reset-start on target stm32f4x.cpu:
>>> (here I am not sure what is going on...)
>>>
>>> it goes to the end, and flash is "correctly" done !
>>>
>>> My only (but big !) concern is that with sysfs or gpiod, the flashing
>>> process takes around
>>> 9-10sec and as specified in the beginning of this message, this is too
>>> much, and
>>> the system battery goes timeout with this duration...
>>>
>>> It is my understanding that the BCM2835gpio driver for OpenOCD uses
>>> specific directs
>>> RAM access to achieve the speed I mesured in my usage (5-6 seconds).
>>> It looks like nothing comparable is available for AMLogic S905Y2/ Radxa
>>> Pi ?
>>> I might have no searched deep enough, or in the right place.
>>> If nothing is available, how do you see this ? Should it be straight
>>> forward to
>>> implement ? Can I get at least the same performances I had with the
>>> BCM2835gpio driver ?
>>>
>>
>> I think there is a gpiod cable in openocd now, but i have not tested it
>> yet.
>>
>> Best,
>>
>>
>>
>>> Best regards,
>>>
>>> --
>>> Maximin COSTE
>>> _______________________________________________
>>> OpenOCD-user mailing list
>>> Ope...@li...
>>> https://lists.sourceforge.net/lists/listinfo/openocd-user
>>>
>> _______________________________________________
> OpenOCD-user mailing list
> Ope...@li...
> https://lists.sourceforge.net/lists/listinfo/openocd-user
>