Re: I query about quality of SuperH-port of newlib

[Dave Nadler <drn at nadler dot com>]

On 10/17/2018 2:52 PM, Israel Jacquez wrote:
> On Wed, Oct 17, 2018 at 11:47 AM Johann-Tobias Schäg <johtobsch@gmail.com>
> wrote:
>
> > Hello,
> >
> > I am looking for a demonstration idea for the "new" J-Core cpu
> > architecture which is actually just open source implementation of a
> > slightly modified SuperH (whose patents expired).
> > I was thinking about porting eLua which depends on newlib.
> > What SH versions do you support?
> > (SH1, SH2, SH3, SH4, SH2a)
> I've been able to use Newlib just fine on SH-2 (Sega Saturn, no MMU).
> Though, 90% of the functionality from Newlib is beyond the scope of the
> hardware.
>
> > If not what would be necessary to port it to J2 (being SH2 + new atomic
> > CAS Instruction + back ported shift instructions from SH3)
> > Does newlib depend on features which require an mmu?
> Please correct me if I'm wrong, but there's a way to override syscalls,
> specifically *sbrk()?

Implement sbrk as appropriate for your memory layout, see:
https://www.embecosm.com/appnotes/ean9/ean9-howto-newlib-1.0.html


> Sincerely Johann-Tobias Schäg
> --

Dave Nadler, USA East Coast voice (978) 263-0097, drn@nadler.com, Skype
 Dave.Nadler1