Since the resources are small if not tiny, a little systems analysis and design is probably needed, but it looks like a bit of fun, until the inevitable moment of "why am I here?".
On Fri, Aug 9, 2019 at 4:50 PM Charles Forsyth <charles.fors...@gmail.com> wrote: > The device I've got is ESP32-WROOM-32. None of the boards I've seen that > use it bother with external memory, > so memory is limited, especially the way it's partitioned. > > On Fri, Aug 9, 2019 at 3:50 PM Charles Forsyth <charles.fors...@gmail.com> > wrote: > >> The ESP32 has got several MMUs. The characteristics are different >> depending on the part that a given MMU accesses (flash, ROM, SRAM, external >> memory). >> Some things are accessed using Memory Protection Units instead, which >> control access by Process ID, but don't do mapping. Others including some >> of the SRAMs are accessed through >> an MMU that can do virtual to physical mapping. The MMUs for internal >> SRAM0 and 2 choose protection for a given physical page as none, one or all >> of PIDs 2 to 7, with the virtual address that >> maps to it. PIDs 0 and 1 can access everything. PID 0 can execute >> privileged instructions. >> A large chunk of SRAM (SRAM 1) has only Memory Protection and no >> translation. The external memory MMU is the most general (most >> conventional). >> >> On Fri, Aug 9, 2019 at 3:19 PM Bakul Shah <ba...@bitblocks.com> wrote: >> >>> esp32 doesn’t have an mmu, right? >>> >>> On Jul 26, 2019, at 03:30, Charles Forsyth <charles.fors...@gmail.com> >>> wrote: >>> >>> I was thinking of doing that since I've got an ESP-32 for some reason >>> >>> On Fri, Jul 26, 2019 at 7:38 AM Cyber Fonic <cyberfo...@gmail.com> >>> wrote: >>> >>>> I was reading the post Why Didn't Plan 9 Succeed >>>> <https://news.ycombinator.com/item?id=20527650> on Hacker News. >>>> >>>> Made me think that Plan 9 for IoT system of systems could be viable. >>>> >>>> To that end, ESP-32 modules look capable enough to run Plan 9, but is >>>> there a Plan 9 C compiler for Xtensa ISA CPUs? >>>> >>>>
