On 7/1/2023 10:27 AM, Tim Hardisty wrote:
Lots of work to do a full u-boot replacement, yes. But a basic one
using existing NuttX stuff such as RNDIS, dfu, mtd etc. - for MY board
at least - would not be much work. He said...naively!
You often can't know how deep the water is until you get a little wet.
One thing I would mention. A bootloader is an app alright. But it may
need to use some of internal OS interfaces to control things like
interrupts, MMU, caches, etc. it may need to reset the CPU or other
actions that normal applications would not do. That raises a few
architectural issues (and explains why those primitive loaders are in
the board src/ directory and not in apps/).
Ideally it would run in supervisor mode with a FLAT memory model.
