ATSAMV71 / ATSAMRH71 ethernet POC with RTEMS-LIBBSD

[Matthew J Fletcher]

Hi Darius,

The if_atsam driver is used extensively on industrial / custom ATSAME71
boards with external SDRAM with LibBSD. The reliability has been very good,
you can see in the LibBSD change log for if_atsam some changes a couple of
years back that resolved the last issues.

regards, Matthew.



On Thu, 27 Jun 2024, 05:22 Dariusz Sabała, <dariusz.sabala at creotech.pl>
wrote:

> Hi
>
> I am working on RTEMS LibBSD Ethernet networking POC on ATSAMV71 and on
> ATSAMRH71
>
> My tries on ATSAMV71 were limited due to very small amount of SDRAM memory
> on evaluation board - its only 2MB.
>
> I managed to do the most on  SAMRH71F20-EK (CQFP package) evaluation board:
> evaluation board is connected to my workstation and I can both ping RH71
> from PC and ping PC from RH71 RTEMS Shell console, it works very well until
> random microcontroller freeze. Sometimes program freezes after 20 ping
> requests + replies, sometimes after 250, but it always freezes and then
> debugging session is broken too, I have to disconnect and attach to see the
> microcontroller state and it is trapped in endless loop I put in bootloader
> startup code to give me a time to inspect the microcontroller state.
>
> It might be a misleading clue, but changing GMAC interrupt priority to be
> numerically bigger than Systick interrupt makes this stress test to endure
> more ping requests.
> Also an AHB Bus Matrix peripheral of SAMRH71 reports some errors, but I
> lack knowledge and documentation on how this certain MCU peripheral (AHB
> matrix controller) works.
> I doubt it, but SAMRH71F20-EK evaluation board could be a source of
> problem too, since it seems they completely ignored hardware design
> recommendations of KSZ8061 PHY.
>
> In order to make if_atsam driver work on ATSAMRH71 I had to:
>
>    - copy and mass sed GMAC driver files, since they changed name of
>    registers macros a bit
>    - change pins configuration to reflect which pins are used on my
>    evalboard
>    - change "rtems_bsd_if_atsam_get_if_media_props" to return
>    is_fixed=true and duplex=IFM_FDX
>    - change SYSINIT_DRIVER_REFERENCE(ukphy, miibus); to
>    SYSINIT_DRIVER_REFERENCE(ksz8091rnb, miibus);  leaving ukhpy lead to
>    crashesh after printing long "sssss" strings
>
>
> Please tell me about a maturity and status of ATSAMV71 if_atsam driver, is
> it tested on any atsamv71 board? Then how, since there is so little memory
> on Xplained Ultra?
> I understand that most of the RTEMS BSP is made only for demonstration
> purposes and that's why I'm asking, maybe someone can tell me what should
> be changed in it to make it work reliably? Do you have any other resources
> to suggest I can use to learn how this stack works beside two readme files
> in rtems-libbsd repo and obviously freebsd documentation?
>
> Anyway, guys - nice job creating rtems-libbsd. I hope to learn more about
> it and use it in our projects.
>
> Best regards
>
> Dariusz Sabała
> Embedded software engineer
> Creotech Instruments
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