Thanks Joel and Kinsey, I agree that QEMU is a good option to get familiar with the OS, but while learning, I am also doing some benchmarks and comparing performance on a number of boards I have around. I have a Hercules Cortex-R5 board but this is not supported and I don't think any other current BSP supports R5, or for that matter, any newer design like R8 or R52. I wonder why I don't see more traction on Cortex-R in general in the scientific or real-time community. Perhaps it is used more broadly on custom designs and there are not so many off-the-shelf boards.
There is a BSP for a TI Hercules R4 but I was expecting not to diverge too much as I am not very familiar with the Cortex-R family and it would take me quite some time to adapt it to Cortex-R5. After all I am doing this in my spare time and I was hoping to get familiar with the system and get a feeling on how the HW performs without going deep in integrating a new board. The Trenz board looks quite good, I will have a look. On the other hand, I hear that the Avnet board is used for research / prototyping by some groups in ESA. Regards, Juan. On Sat, 20 Feb 2021, at 12:05 AM, Kinsey Moore wrote: > On Fri, Feb 19, 2021 at 4:43 PM Joel Sherrill wrote: > > I've cc'ed Kinsey Moore and asked him to subscribe to this list so he can > reply. > > On Fri, Feb 19, 2021 at 11:46 AM Juan Solano <j...@jsolano.com> wrote: >> Hi all, >> >> I was looking for a bsp that supports a Cortex-R5 board and it seems the >> only one available is the Xilinx Zynq bsp, is that correct? It was not clear >> to me if this bsp is working on the Cortex-R5 processors of the board. > > Kinsey did an R5 for a custom SOC that never saw silicon. He can tell you > what is in RTEMS and give you an idea what needs to be done. > > It was actually a Cortex-R52, but the work was never finished or polished for > submission. It’s publicly available here: > https://github.com/ISI-apex/rtems/tree/hpsc-1.3/bsps/arm/gen-r52/ > > It was a relatively complicated custom board (and QEMU environment), so while > the peripherals and core CPU support may be useful the remainder is unlikely > to be. > > The Cortex-R5 CPUs on the Zynq Ultrasacle+ MPSoC do not currently have a BSP, > but I imagine a basic BSP could be brought up relatively quickly. The > arm/xilinx_zynqmp BSP actually targets the A53 cores in 32bit/ARMv7 mode. > > I think as part of the aarch64 port Kinsey has submitted, we looked at this > board and decided not to get it because it didn't have wired Ethernet. > Someone has told me there is an add-on shield to add it, But I don't know for > sure or have a link to that. > > Kinsey has been using another Avnet board and a board from Trenz. Both have > wired networking. > > If you haven’t yet purchased a board, I’d highly recommend the Trenz board > for cost reasons. It also has a PHY that’s already supported in LibBSD. > https://shop.trenz-electronic.de/en/TE0802-02-2AEU2-A-MPSoC-Development-Board-with-Xilinx-Zynq-UltraScale-ZU2-and-LPDDR4 > >> >> Is the Avnet Ultra96-V2 a good recommendation to experiment with? I am >> currently just learning RTEMS, which makes other boards too expensive for my >> needs. > > If you are just learning RTEMS, the first step we always recommend is a > simulator since they are free. Qemu has a Zynq simulation which I think all > the core developers use from time to time. Kinsey has spent a lot of time on > Qemu for the aarch64 and there are BSPs in the tree for that. He is close to > another round of submissions which he should talk about. > > The user manual has been updated with information on how to start QEMU for > both the generic Cortex-A53 BSP and also for the zynqmp BSP. There are some > more details for network on QEMU, but that will also be getting posted when > the rest of the patches go up. > > Simulators are great for getting familiar with things. The same cross > toolchain can be used and it is just a matter of switching BSPs. It works as > long as the simulator has enough IO for your initial steps. > > Let me know if you have any questions about any of this. > > Kinsey
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