Got another response from my earlier request to Raspberry Pi through their website:
Hi Matteo > Thanks for getting in touch. We don't actually have any more documentation > that we can release on this. My usual recommendation is for SW people to > take a look at the Linux drivers to get a closer understanding of how the > HW works. Not ideal, but the best I can offer. So I guess everyone is telling us the same thing! On Mon, Sep 1, 2025 at 3:49 PM Tomek CEDRO <[email protected]> wrote: > Sure! Public now :-) > Tomek > > On Mon, Sep 1, 2025 at 9:24 PM Matteo Golin <[email protected]> > wrote: > > > > I have populated the RPi 4B project with some starting issues to tackle > for > > the 4B implementation. I see that the project is marked as private; is > > there any way to make it visible to potential contributors just visiting > > the GitHub page? I think if they can see a list of issues in one place > when > > they go to the page it might help. > > > > Thanks, > > Matteo > > > > On Mon, Sep 1, 2025 at 3:02 PM Tomek CEDRO <[email protected]> wrote: > > > > > Thank you Linguini, good luck and have fun! :-) > > > Tomek > > > > > > On Mon, Sep 1, 2025 at 8:48 PM Matteo Golin <[email protected]> > > > wrote: > > > > > > > > To update the community, we've been told by Gordon that the Pi > Foundation > > > > doesn't have any documentation for the chip beyond what was written > in > > > the > > > > peripheral datasheet. Broadcom themselves has written the Linux > drivers > > > and > > > > Raspberry Pi has only made some slight bug fixes, etc. We've been > > > suggested > > > > to read the source to discover undocumented registers/configuration > > > options. > > > > > > > > I plan to still continue with the port until the feature set on > NuttX is > > > > equal or greater to what is available on QNX. I at least want to get > > > > Ethernet and some graphics running after the base peripheral set > (I2C, > > > SPI, > > > > UART) are supported. > > > > > > > > Matteo > > > > > > > > On Sun, Aug 31, 2025 at 6:10 PM Matteo Golin <[email protected] > > > > > wrote: > > > > > > > > > Very interesting Sebastian. I got that impression from Broadcom > when I > > > was > > > > > initially trying to port NuttX to the Pi. The inability to submit > > > forms on > > > > > their website seems like it might be by design... > > > > > > > > > > I'm hopeful the Raspberry Pi Foundation will have something more > for > > > us to > > > > > work with, they seem more positive to FOSS. Otherwise I will still > > > continue > > > > > with reverse engineering until at least the point where the > > > functionality > > > > > driver-wise is on par with QNX. > > > > > > > > > > On Sun, Aug 31, 2025, 10:46 AM Tomek CEDRO <[email protected]> > wrote: > > > > > > > > > >> James Dougherty contacted us with Gordon Hollingworth from > Raspberry > > > > >> Pi Foundation recently :-) We are waiting for response :-) I > really > > > > >> hope we can get some sort of documentation and/or code samples to > > > > >> write high quality NuttX port for the big raspberries :-) > > > > >> > > > > >> Open-Source matters even more in this crazy world. Thanks for > > > > >> interesting article Sebastien! Personally I think we should focus > only > > > > >> on vendors that support Open-Source. What is the reason for > bumping > > > > >> sales for companies that in the end can sue you for reversing? :D > > > > >> > > > > >> Have a good day folks :-) > > > > >> Tomek > > > > >> > > > > >> > > > > >> > > > > >> On Sun, Aug 31, 2025 at 10:15 AM Sebastien Lorquet < > > > [email protected]> > > > > >> wrote: > > > > >> > > > > > >> > Hello, > > > > >> > > > > > >> > I just found this interesting document: > > > > >> > > > > > >> > > > > > >> > > > > https://fastcode.io/2025/08/30/the-69-billion-domino-effect-how-vmwares-debt-fueled-acquisition-is-killing-open-source-one-repository-at-a-time/ > > > > >> > > > > > >> > In a summary, if you expect anything cool from broadcom: dont. > > > > >> > > > > > >> > go go go reverse engineering! > > > > >> > > > > > >> > Sebastien > > > > >> > > > > > >> > > > > > >> > On 8/29/25 15:37, Tomek CEDRO wrote: > > > > >> > > No response from #infra@slack, I just sent request to > > > > >> > > [email protected] mailing list maybe someone can reply > over > > > there > > > > >> > > :-) > > > > >> > > > > > > >> > > > https://lists.apache.org/thread/n9y5vrvjm23npwgbr45f7zq5ys5l8dok > > > > >> > > > > > > >> > > We should also know the official stance from Broadcom and RPI > > > > >> Foundation :-) > > > > >> > > > > > > >> > > Thanks :-) > > > > >> > > Tomek > > > > >> > > > > > > >> > > On Thu, Aug 28, 2025 at 9:35 PM Tomek CEDRO <[email protected] > > > > > wrote: > > > > >> > >> I just asked question at #asfinfra / slack, maybe someone can > > > help > > > > >> > >> there or recommend someone who can, waiting for response :-) > > > > >> > >> > > > > >> > >> For a good start you can contact Broadcom and RaspberryPi > > > Foundation, > > > > >> > >> introduce yourself as Apache NuttX RTOS developer that want > to > > > port > > > > >> > >> NuttX to rPI boards, and just ask if DataSheets are available > > > :-) We > > > > >> > >> will know then first hand if this is possible or are there > any > > > > >> > >> problems / requirements :-) > > > > >> > >> > > > > >> > >> You can ask for 4B and probably Zero-2W SoC documentation > these > > > seems > > > > >> > >> most popular nowadays :-) > > > > >> > >> > > > > >> > >> Thanks :-) > > > > >> > >> Tomek > > > > >> > >> > > > > >> > >> > > > > >> > >> > > > > >> > >> On Thu, Aug 28, 2025 at 8:45 PM Matteo Golin < > > > [email protected]> > > > > >> 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 < > [email protected]> > > > > >> wrote: > > > > >> > >>> > > > > >> > >>>> On Tue, Aug 26, 2025 at 10:05 PM Matteo Golin < > > > > >> [email protected]> > > > > >> > >>>> 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 > > > > >> > >>>> > > > > >> > >> > > > > >> > >> > > > > >> > >> -- > > > > >> > >> CeDeROM, SQ7MHZ, http://www.tomek.cedro.info > > > > >> > > > > > > >> > > > > > > >> > > > > >> > > > > >> > > > > >> -- > > > > >> CeDeROM, SQ7MHZ, http://www.tomek.cedro.info > > > > >> > > > > > > > > > > > > > > > > > -- > > > CeDeROM, SQ7MHZ, http://www.tomek.cedro.info > > > > > > > -- > CeDeROM, SQ7MHZ, http://www.tomek.cedro.info >
