Yes, now I remember the reason to it has been removed. BTW, I think 6502 will face same issue because the stack point is only 8-bits (it will be limited to 256 bytes), correct?
On 1/8/22, Gregory Nutt <spudan...@gmail.com> wrote: > Support for the 8051 was removed for other reasons... that family has a > very small hardware stack that had to be saved and restored on each context > switch. That provided bigtime compatibility issues with other > architectures. That combined with the facts that (1) I never could get the > 8051 running reliably without stack overflows, and (2) the 8051 was not > really a viable platform for NuttX because it was so limited in other ways. > > That is ancient history from 2014. I used to carefully document why any > feature was removed from the OS and kept that here: > https://bitbucket.org/patacongo/obsoleted/src/60ec01456d8b09f5b813a5fd8865cdbd5a0ccc20/ChangeLog#lines-4 > > On Sat, Jan 8, 2022 at 7:45 AM Alan Carvalho de Assis <acas...@gmail.com> > wrote: > >> Hi Tomasz, >> >> Currently NuttX doesn't support 6502 and even the support to 8051 was >> removed some years ago. >> >> BTW, I think it could be possible to support C99 for 6502 if you use gcc: >> https://github.com/itszor/gcc-6502-bits >> >> BR, >> >> Alan >> >> On 1/8/22, Tomasz CEDRO <to...@cedro.info> wrote: >> > On Sat, Jan 8, 2022 at 1:53 PM Gregory Nutt wrote: >> >> z80 holds all 8-bit ZiLOG architectures. That means >> >> >> >> z80 using the SDCC compiler >> >> z180 using the SDCC compiler >> >> ez80 which normally uses the ZiLOG compiler, but there is an >> experimental >> >> version of GCC for the ez80 >> >> >> >> z16 uses only ZiLOG compiler >> >> >> >> Also consider SH1 >> >> >> >> This will also require changes to INVIOLABLES.md and the coding >> standard. >> >> I would also recommend a formal vote to assure that you are following >> the >> >> will of the user base and not a personal agenda. There used to be a >> >> small >> >> but important group of retro computer folk using NuttX; this >> >> eliminates >> >> support for them. There is language in the INVIOLABLES that is there >> >> specifically to protect them from actions like this. >> >> >> >> I have not heard of anyone using these architectures recently. I >> >> would >> >> say >> >> that only ez80 is active with active development boards. There are >> >> occasional developments with z180-like hardware. >> > >> > One day I would love to run NuttX on 6502.. it would be nice if C99 >> > wont make it impossible (why should it?).. but my knowledge is too >> > small so I will look how the thread goes :-) >> > >> > -- >> > CeDeROM, SQ7MHZ, http://www.tomek.cedro.info >> > >> >
