Re: [PATCH v3 3/5] RISC-V: Fix unsupported isa string info.

[Atish Patra]

On Tue, 2019-08-06 at 18:26 -0700, Paul Walmsley wrote:
> On Wed, 7 Aug 2019, Atish Patra wrote:
> 
> > On Tue, 2019-08-06 at 16:27 -0700, Paul Walmsley wrote:
> > 
> > > Seems like the "su" should be dropped from mandatory_ext.  What
> > > do you 
> > > think?
> > > 
> > 
> > Yup. As DT binding only mention imafdc, mandatory extensions should
> > contain only that and just consider "su" extensions are considered
> > as
> > implicit as we are running Linux. 
> 
> Discussing this with Andrew and Palmer, it looks like "su" is
> currently 
> non-compliant.  Section 22.6 of the user-level specification states
> that 
> the "s" character indicates that a longer standard supervisor
> extension 
> name will follow.  So far I don't think any of these have been
> defined.
> 
> > Do you think QEMU DT should be updated to reflect that ?
> 
> Yes.
> 
> > > There's no Kconfig option by this name, and we're requiring
> > > compressed 
> > 
> > Sorry. This was a typo. It should have been CONFIG_RISCV_ISA_C.
> > 
> > > instruction support as part of the RISC-V Linux baseline.  Could
> > > you 
> > > share the rationale behind this?
> > 
> > I think I added this check at the config file. Looking at the
> > Kconfig,
> > RISCV_ISA_C is always enabled. So we can drop this.
> 
> OK great.  Do you want to resend an updated patch, or would you like
> me to 
> fix it up here?
> 

I am sending the patch right now. We can remove the 'S' mode check as
palmer have already sent the QEMU patch as well, .

Regards,
Atish
> I'll also send a patch to drop CONFIG_RISCV_ISA_C.
> 
> 
> - Paul