[lowrisc-dev] Support for Fedora / compressed extension

Richard W.M. Jones rjones at redhat.com
Sun Apr 1 22:29:05 BST 2018

On Sun, Apr 01, 2018 at 10:57:53PM +0200, Karsten Merker wrote:
> On Sun, Apr 01, 2018 at 09:31:16PM +0100, Richard W.M. Jones wrote:
> > Hi, I was going to try v0.5 on my Nexys 4 DDR.  However I believe
> > that this version doesn't support the Compressed extension.  I
> > disassembled the sample bbl and there are no short instructions.
> > Is support for the C extension available and/or planned?
> Hello,
> AFAIK the lowRISC 0.5 release uses an older version of the rocket
> core without C support and still at priv-1.9.1 (according to the
> table at http://www.lowrisc.org/docs/ethernet-v0.5/).  AIUI, the
> latter means that Fedora wouldn't run even when compiled without
> C instructions as mainline glibc requires at least kernel 4.15
> and kernel 4.15 to the best of my knowledge requires
> priv-1.10-compatible hardware.

Yes that's interesting because it applies to Debian and
indeed any conceivable Linux distro ...

> Somebody mentioned before that there are plans to move lowRISC to
> a priv-1.10-compliant version of rocket but without mentioning an
> estimated timeframe, so I would like to use this opportunity to
> ask on the list what the plans in this regard look like.


Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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