Hi again, (Thank you, Lup, for these excellent articles. They are a very valuable resource! :-)
Now at a computer, I can actually find the links to some relevant articles... These two are an excellent starting point to understand how to get NuttX to boot on these "bigger" embedded systems... https://lupyuen.codeberg.page/articles/arm.html#will-nuttx-boot-on-pinephone https://lupyuen.codeberg.page/articles/uboot.html Now, I seem to recall that one of Lup's articles showed step-by-step how to study the details of the Linux boot process to learn how to initialize the CPU properly, and then apply that knowledge to boot NuttX. I can't seem to find it right now, but definitely look through the blog because you'll find a lot of helpful techniques there. Cheers, Nathan On Thu, Jul 25, 2024 at 10:14 AM Lee, Lup Yuen <lu...@appkaki.com> wrote: > > Hi Matteo: Please lemme know if you have any questions about NuttX on > PinePhone (Arm64 Cortex-A53) > > (Thanks Nathan :-) > > Lup > > On Thu, Jul 25, 2024 at 9:34 PM Nathan Hartman <hartman.nat...@gmail.com> > wrote: > > > Hi Matteo, > > > > The blog of Lup Yuen LEE is a very valuable resource. Lup did a port of > > NuttX to PinePhone, which is a 64-bit architecture that could be said to be > > on a similar level to RPi 4B. > > > > There are many other articles that you will likely find helpful: > > > > https://lupyuen.codeberg.page/ > > > > I recommend to start by finding the PinePhone-related articles first. > > > > Cheers > > Nathan > > > > > > On Wed, Jul 24, 2024 at 9:15 PM Matteo Golin <matteo.go...@gmail.com> > > wrote: > > > > > Hello all, > > > > > > I am working on a port for NuttX to the Raspberry Pi 4 Model B, for > > which I > > > am using Gregory's previous port to the BCM2708 as a reference. > > > > > > I've read through the documentation available here > > > <https://nuttx.apache.org/docs/latest/> to get a better grasp of how > > NuttX > > > works "under the hood", but I'd still like to know more. The port started > > > out rosy with copying register addresses and bitmasks from the datasheet > > to > > > header files, and now that I've completed that, I'm not sure of where to > > > start. There seem to be a number of interfaces that need implementing in > > > order to make a pretty minimal boot of NuttX, but I'm not sure where (if > > > anywhere) I can determine a list of what needs to be implemented or if > > > there's a general process to it. > > > > > > So far my best idea is to re-review the documentation to see if I can get > > > more to stick, and in the meanwhile also try to read through and > > understand > > > an existing port's implementation for one of the simpler MCUs. > > > > > > If there are any suggestions as to what steps I should take to facilitate > > > porting NuttX or understanding more about the OS, I would be eager to > > hear > > > them! > > > > > > Thanks, > > > Matteo > > > > >
