foc without kernel debugger

[Stefan Kalkowski]

Hello Johannes & Matthias,

On Thu, Jul 05, 2018 at 09:52:16AM +0200, Matthias Lange wrote:
> Hi Johannes,
> 
> On [04-07-2018 15:06], Johannes Kliemann wrote:
> > Hi all,
> > 
> > I tried to use Fiasco.OC without the kernel debugger, respectively with
> > the following config changes:
> > 
> > > diff --git a/repos/base-foc/config/x86_64.kernel b/repos/base-foc/config/x86_64.kernel
> > > index 07159da20d..8b8b1c8c50 100644
> > > --- a/repos/base-foc/config/x86_64.kernel
> > > +++ b/repos/base-foc/config/x86_64.kernel
> > > @@ -56,12 +56,7 @@ CONFIG_STACK_DEPTH=y
> > >  # CONFIG_IRQ_SPINNER is not set
> > >  # CONFIG_WATCHDOG is not set
> > >  CONFIG_SERIAL=y
> > > -CONFIG_JDB=y
> > > -CONFIG_JDB_LOGGING=y
> > > -CONFIG_JDB_DISASM=y
> > > -CONFIG_JDB_GZIP=y
> > > -# CONFIG_JDB_ACCOUNTING is not set
> > > -CONFIG_JDB_MISC=y
> > > +# CONFIG_JDB is not set
> > >  CONFIG_POWERSAVE_GETCHAR=y
> > >  # CONFIG_WARN_NONE is not set
> > >  CONFIG_WARN_WARNING=y
> > 
> > It compiles without any errors but the execution fails with multiple
> > messages of:
> > 
> > > KERNEL: Warning: nothing mapped: (Obj_space) from [0xffffffff81fd1e90/ffffffffffffffff]: 000000000000000a size: 0000000000000001 to [0xffffffff81fd1d80/ffffffffffffffff]
> 
> This message indicates that somebody is trying to map a capability without
> sufficient rights or the mapped capability is the invalid cap.
> 
> Maybe a component has a hard dependency on the 'jdb' capability?

Indeed, core maps that capability to each component, but it is not
critical. The capability is only used for testing purposes. Normally
it is not used. Thereby the warning can be ignored. If I uncomment the
mapping the warning vanishes. Moreover, core sets names to ease
debugging for all threads in the kernel debugger. I've prepared an
interims commit for you to use Genode/Fiasco.OC without kernel
debugger:

  https://github.com/skalk/genode/commit/e38ebf4a2de0029f46afdc5b6b6f3c480388fcf2

Anyway, you won't see any messages on serial line from Genode, because
it uses the kernel debugger's outstring method.

Best regards
Stefan

> 
> Best,
> Matthias.
> 
> > 
> > Are there any further requirements to use foc without the kernel debugger?
> > 
> > Regards,
> > Johannes
> > 
> > _______________________________________________
> > Genode users mailing list
> > users at lists.genode.org
> > https://lists.genode.org/listinfo/users
> 
> -- 
> Matthias Lange, matthias.lange at kernkonzept.com, +49-351-41 888 614
> 
> Kernkonzept GmbH.  Sitz: Dresden.  Amtsgericht Dresden, HRB 31129.
> Geschäftsführer: Dr.-Ing. Michael Hohmuth
> 
> 
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-- 
Stefan Kalkowski
Genode labs

https://github.com.skalk | https://genode.org