Re: New Pico2

Richard Kettlewell <invalid@invalid.invalid> wrote:

It’s a slightly odd device, isn’t it?
 
If you wanted to explore RISC-V then there’s more flexible options. If
you just wanted a microcontroller for something and didn’t care too much
about CPU architecture then the dual-architecture thing is wasted. Two
entire CPU cores that you don’t get to use.

Microcontroller RISC-V cores are so small that I presume it's just thrown on
there as a test to see how things pan out.  You can do a basic RV32 in a few
hundred lines of SystemVerilog and, if it doesn't have its own on-chip
memory, it takes pretty minimal area. It's the area for on-chip RAM, on-chip
flash, registers, caches and TLBs that costs.

It sounds like one of their devs had a hobby core on his github and they put
it on the chip just because they could.  What I'm more interested in is what
QA they did on it and what tools they used.  It's easy to write a core but
embarassing if it doesn't do what you think it does[1].  Perhaps the
'enabling/disabling' mechanism is a chicken bit to wall it off in case
something bad is discovered in it.

Theo

[1] https://ghostwriteattack.com/