Hi Matteo, I think for WiFi/BLE the driver will be straightforward after we get SDIO working because RPi uses the same Broadcom chip (BCM43455) that is already supported on NuttX.
Fun fact is that WiFi driver was created by Cypress after they bought the Broadcom WiFi IoT division ( https://investors.broadcom.com/news-releases/news-release-details/cypress-acquire-broadcoms-wireless-internet-things-business ). Probably some big company asked for NuttX support for that WiFi chip and Cypress did it and then we found their code and integrated it into the mainline. The RaspberryPi company/foundation normally does the Linux port, so they don't need to release any secret documentation from Broadcom. So we need to make NuttX more widespread first to get this same level of benefits :-) It means that probably we will need to do reverse engineering to get these other drivers working. We cannot look at the Linux source code, because it is GPL license, but we can look at the FreeBSD code: https://wiki.freebsd.org/arm/Raspberry%20Pi BR, Alan On Thu, Aug 28, 2025 at 3:45 PM Matteo Golin <matteo.go...@gmail.com> wrote: > Hi Tomek, > > Thanks so much! I actually hadn't thought of that, maybe we could ask for > help from the foundation. Do you know who's the best point of contact for > that? > > I know Linux must have received the datasheets to make Raspberry Pi OS. No > offence to NuttX, but Linux is pretty popular in comparison. If Broadcom or > Raspberry Pi would release us some information that would be an immense > help. I suspect there was some kind of deal with the Linux group but I have > no idea. I believe even QNX didn't have access to the datasheets and rather > just reverse engineered the Linux drivers. > > Matteo > > On Thu, Aug 28, 2025, 12:42 PM Tomek CEDRO <to...@cedro.info> wrote: > > > On Tue, Aug 26, 2025 at 10:05 PM Matteo Golin <matteo.go...@gmail.com> > > wrote: > > > I2C still needs some work unfortunately. However, I agree with you > > > generally. Personally, I think HDMI, networking (including WiFi and > BLE) > > > and some kind of interaction with storage (eMMC or SD card) are the > most > > > important. Unfortunately, those are likely going to be the most > difficult > > > because of the lack of documentation on the peripherals. It is > definitely > > > not an impossible task, but it will be challenging. Hence my request > for > > > creating the new project roadmap, so maybe some discoveries can be > > > documented there and more eyes can get on the RPi implementation. > > > > The lack of documentation is a real pain, and known issue for years in > > many areas, but some vendors are especially famous for that. > > > > Considering someone wants to create Open-Source drivers for free and > > bring customers to the vendor. > > > > Maybe we could ask Apache Foundation for help in obtaining required > > datasheets? :-) > > > > -- > > CeDeROM, SQ7MHZ, http://www.tomek.cedro.info > > >
