RP2350 support

[extrowerk]

RP2040 successor : https://dmitry.gr/?r=06.%20Thoughts&proj=11.%20RP2350

• 2x Cortex-M33F
• improved DMA
• more and improved PIO
• external PSRAM support
• variants with internal flash (2MB) and 80 pins (!)
• 512KiB ram (double)
• some RISC-V cores? Low power maybe?

[chettrick]

That's really interesting!
I haven't looked much into any of the new Cortex M33 chips since all the CMSIS stuff is Apache 2 licensed.
I wonder if anyone has clean-room made their own. Seems like an enormous task.

Too bad there wasn't a Pi Pico with a Cortex M4 and tons of RAM. Would be excellent.

I could do what a lot of other projects do and just git submodule the CMSIS and HAL stuff, but I would like the OS to be as self-contained as possible.
I'll keep thinking about this..

[chettrick]

Oh, and new release is on the 11th. Get any bug fixes in asap.