lkml.org 
[lkml]   [2014]   [Dec]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 07/10] MIPS: support for hybrid FPRs
Hi,

On Tue, Dec 23, 2014 at 11:31:54PM +0000, James Hogan wrote:
> On Wed, Dec 24, 2014 at 01:21:11AM +0200, Aaro Koskinen wrote:
> > On Thu, Sep 11, 2014 at 08:30:20AM +0100, Paul Burton wrote:
> > > Hybrid FPRs is a scheme where scalar FP registers are 64b wide, but
> > > accesses to odd indexed single registers use bits 63:32 of the
> > > preceeding even indexed 64b register. In this mode all FP code
> > > except that built for the plain FP64 ABI can execute correctly. Most
> > > notably a combination of FP64A & FP32 code can execute correctly,
> > > allowing for existing FP32 binaries to be linked with new FP64A binaries
> > > that can make use of 64 bit FP & MSA.
> >
> > This commit (4227a2d4efc9c84f35826dc4d1e6dc183f6c1c05, bisected)
> > in 3.19-rc1 breaks my Loongson-2F system. I get endless amount
> > of "Reserved instruction in kernel code" exceptions when booting.
> > See some examples below. Nothing crashes, and there is some forward
> > progress, but obviously it's completely unusable.
> >
> > Any ideas?
> >
> > [ 2.872000] Reserved instruction in kernel code[#1]:
> ...
> > Code: 30420001 2c420001 0040202d <40038005> 2405feff 00651824 40838005 3c032000 3c052400
>
> 0x40038005 = mfc0 v1,$16,5 = mfc0 v1,Config5
>
> Does this help (in linux-next)?:
> http://git.linux-mips.org/cgit/ralf/upstream-sfr.git/commit/?id=5bba8dec735f18fe7a2fcd8327f28ef095337ff2

Yes, it does. Many thanks!

A.


\
 
 \ /
  Last update: 2014-12-24 01:21    [W:0.066 / U:0.072 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site