Gabriel.. can you at least file a ticket and put your source on it for others to start from? I suspect that if it works, it is likely OK to merge unless you have other concerns.Posting it as a patch would be great.
Viraj.. there isn't a leon3 network controller simulation in qemu. There were free bitstreams for some FPGA boards but I don't know if they include the network and I can't find them anymore. --joel On Sun, Feb 26, 2023 at 3:22 AM Viraj Jagadale <virajjagadale...@gmail.com> wrote: > Thanks, Gabriel, I will surely go through it this week. > > I have been reading about writing driver code and noted the following > steps that I would need to follow: > > 1. > > Select the hardware device for which the driver has to be written. > 2. > > Read the device specification and protocol used. Find the device > address to communicate with the device > 3. > > Write the skeleton driver to handle basic operations such as > input/output, and initialization. > 4. > > Implement necessary functions for Greth lwip, such as a low-level > interface between the driver and lwip networking stack. > 5. > > Testing and optimizing the driver. > > > As Daniel suggested, I read about the GBIT Ethernet MAC and made notes on > Google Docs. As I learn more about the various sections, I will add more > content to this doc file > <https://docs.google.com/document/d/1a12F6O883W9g06EP9k1KFMJX8wQq0TGRg9nUP0qLyfI/edit?usp=sharing> > . > > I had a question about hardware. Can I complete this project with the Qemu > emulator? > > Regards, > Viraj > > On Fri, Feb 24, 2023 at 4:28 PM <gabriel.moy...@dlr.de> wrote: > >> Hi Viraj, >> >> >> >> Please find the code in this branch: >> https://github.com/GabrielDai/rtems-libbsd/tree/port-greth-to-5-freebsd-12 >> >> >> >> Since this driver depends on drvmgr, you’ll have to compile your bsp with >> support for it (make sure your bsp register the driver for your gaisler >> card using the drvmgr functions). >> >> Moreover, it is needed to add the following line for your bsp in >> “nexus-devices.h” (rtems-libbsd): >> >> SYSINIT_DRIVER_REFERENCE(grcard, pci); >> >> This line will add a device (called grcard). >> >> During booting (if the gaisler card get recognized) it will create child >> devices (greth#) for the ethernet interfaces. >> >> >> >> I hope this helps you. >> >> >> >> Have fun coding, >> >> Gabriel >> >> >> >> *Von:* Viraj Jagadale <virajjagadale...@gmail.com> >> *Gesendet:* Dienstag, 21. Februar 2023 17:36 >> *An:* Moyano Heredia, Victor Gabriel <gabriel.moy...@dlr.de>; >> dan...@gaisler.com; devel@rtems.org >> *Betreff:* Re: Project Discussion for GSoC 2023 >> >> >> >> Hi Daniel and Gabriel, >> >> >> >> Thank you for responding. I don't own an ARTY A7-100T board. As >> suggested, I will study the GRETH_GBIT manual at the same time. Can I refer >> to the DP83848 or LAN8742A documentation for stm32, both of which support >> legacy stack and lwip? If not, could you please recommend a device? >> >> >> Please share the driver for rtems-libbsd with me as it will be very >> useful as a starting point. >> >> >> >> Regards, >> >> Viraj. >> >> >> >> On Tue, Feb 21, 2023 at 2:00 PM <gabriel.moy...@dlr.de> wrote: >> >> Hi Viraj, >> >> >> >> We ported the driver for greth to rtems-libbsd in the past but never got >> to submit it (it might need some further refinement). The driver depends on >> the driver manager (drvmgr). Not sure if this is the best approach but it >> is a good starting point and we’d be happy to share it. >> >> >> >> Best regards, >> >> Gabriel >> >> >> >> >> >> *Von:* devel <devel-boun...@rtems.org> *Im Auftrag von *Daniel Hellstrom >> *Gesendet:* Montag, 20. Februar 2023 15:59 >> *An:* Viraj Jagadale <virajjagadale...@gmail.com>; devel@rtems.org >> *Cc:* kinsey.mo...@rtems.org; and...@chichak.ca >> *Betreff:* Re: Project Discussion for GSoC 2023 >> >> >> >> Hi Viraj, >> >> There is an old GRETH network driver as part of the old network stack >> that would be a good reference. >> >> Note that the old driver supports two IPs (GRETH 10/100, and GRETH_GBIT >> 10/100/1000). The GRETH_GBIT IP is mostly backwards compatible with the >> GRETH, but as some additional functionality to off load the CPU with >> UDP/TCP check-summing, unaligned DMA, and scatter-gather DMA for example. >> One approach could be to begin to focus on the more capable GRETH_GBIT IP >> first, section 14: >> >> https://www.gaisler.com/doc/gr740/GR740-UM-DS-2-5.pdf >> >> or from the IP manual, section XX: >> >> https://www.gaisler.com/products/grlib/grip.pdf >> >> Please keep in mind that the GRETH driver will be used by both >> SPARC/LEON3 BSP and RISC-V/NOEL-V BSP in the future. >> >> It sounds as a good approach to look at the interface of the LWIP stack >> towards the Network Device Driver, for example the DEC driver to learn >> however the best would be if there is a MAC device supported both by legacy >> stack and the LWIP? Simultaneously you could study the GRETH_GBIT manual >> with register and DMA interface and the old device driver source code? >> >> If you have a ARTY A7-100T board you could use the RISC-V design to get >> access to the GRETH IP easily get started with. The GRMON eval version >> would also work together with it for a hardware-debugger (no additional >> cost required) which you can connect GDB for source debugging if you wish: >> >> https://www.gaisler.com/index.php/products/processors/noel-v-examples >> >> https://www.gaisler.com/index.php/products/debug-tools/grmon3 >> >> Kind Regards, >> Daniel >> >> >> >> >> >> >> >> On 2023-02-13 04:25, Viraj Jagadale wrote: >> >> Dear Community, >> >> I am interested in contributing to RTEMS and will be participating in >> GSoC 2023. I am interested in projects #4595 >> <https://devel.rtems.org/ticket/4595> and #4596 >> <https://devel.rtems.org/ticket/4596> because I am passionate about >> networking. I'm currently concentrating solely on #4595. I'm aware that >> I'll need to study and comprehend the lwip stack documentation, as well as >> how the Ethernet protocol is implemented and networking services are >> provided for applications. Then I'll have to devise a strategy for >> designing the driver architecture. I'm thinking about reading the RTEMS >> Legacy Networking User Manual and understanding the DEC 21140 example to >> get started. I'm not sure if this is the right approach, and I'll need your >> advice. I am also willing to help with existing bugs and documentation >> updates. >> >> >> >> Regards, >> >> Viraj Jagadale. >> >> _______________________________________________ > devel mailing list > devel@rtems.org > http://lists.rtems.org/mailman/listinfo/devel
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