Hi Matteo and Nathan: This article explains every step of NuttX booting on Arm64 PinePhone, hope it helps :-)
https://lupyuen.codeberg.page/articles/unicorn2.html#pinephone-boots-nuttx Lup On Thu, Jul 25, 2024 at 10:59 PM Nathan Hartman <hartman.nat...@gmail.com> wrote: > 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 > > > > > > > >
