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 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
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