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.
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