Wow! What a journey! Thank you Lup!! :-) -- CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
On Sun, Apr 13, 2025 at 2:07 AM Lee, Lup Yuen <lu...@appkaki.com> wrote: > > NuttX is officially supported on Avaota-A1 Arm64 SBC (Allwinner A527 SoC). > Let’s take Unicorn Emulator and create a Software Emulator for Avaota SBC... > > (1) We call Unicorn Library to create our Barebones Emulator > > (2) Emulate the 16550 UART hardware by intercepting I/O Memory > > (3) Recompile NuttX with 4 Tiny Tweaks and boot on Unicorn > > (4) NuttX makes a Context Switch and fails > > (5) Because Unicorn doesn’t handle Arm64 SysCalls? > > (6) No worries we’ll Emulate Arm64 SysCalls ourselves! > > (7) By jumping into the Arm64 Vector Table > > (8) NuttX on Unicorn boots to NSH Shell! (Almost) > > (9) How exactly does NuttX boot on Avaota SBC? We have a Detailed Boot Flow > > Why are we doing this? > > -- So we can create NuttX Drivers and Apps on Avaota SBC Emulator (without > the actual hardware) > > -- Avaota Emulator is helpful for NuttX Continuous Integration, making sure > that all Code Changes will run correctly on Avaota SBC > > -- The Trade Tariffs are Terribly Troubling. Some of us NuttX Folks might > need to hunker down and emulate Avaota SBC, for now. > > -- Or maybe we should provide Remote Access to a Real Avaota SBC? 🤔 > > Check out the article: https://lupyuen.org/articles/unicorn4.html > > > > Lup >
