# RE: hang w/ppc6xx\_defconfig related to 'simple-bus' compatible

- From: John Linn \<hidden\>
- Date: 2008-08-06 19:03:52 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2008/08/9444254
- Thread: https://ratatoskr.run/linuxppc-dev/2008/08/9444153/t.md

```text
I was thinking it's CONFIG_PPC_UDBG_16550.

-- John

> -----Original Message-----
> From: <redacted>
[mailto:linuxppc-dev-
> bounces+john.linn=3Dxilinx.com@ozlabs.org] On Behalf Of Kumar Gala
> Sent: Wednesday, August 06, 2008 12:39 PM
> To: Stephen Neuendorffer
> Cc: Scott Wood; ppc-dev list
> Subject: Re: hang w/ppc6xx_defconfig related to 'simple-bus'
compatible
> =

> Do you know what the CONFIG_ option is called for the legacy driver.
> =

> - k
> =

> On Aug 6, 2008, at 1:02 PM, Stephen Neuendorffer wrote:
> =

> >
> > The problem (in my case) is that the legacy-serial driver doesn't
> > accept
> > all of the 16550 configurations accepted by the regular ns16550
> > driver.
> > The problem is not related to simple-bus, but only became visible
when
> > simple-bus bindings are used because the legacy-serial driver
> > specifically looks for an ns16550 node contained by a simple-bus.
> >
> > Most likely the hpcn_defconfig disables the legacy-serial driver
> > altogether.
> >
> > Steve
> >
> >> -----Original Message-----
> >> From:
linuxppc-dev-bounces+stephen.neuendorffer=3Dxilinx.com@ozlabs.org
> > [mailto:linuxppc-dev-
> >> bounces+stephen.neuendorffer=3Dxilinx.com@ozlabs.org] On Behalf Of
> >> Scott
> > Wood
> >> Sent: Wednesday, August 06, 2008 10:36 AM
> >> To: <redacted>
> >> Cc: ppc-dev list
> >> Subject: Re: hang w/ppc6xx_defconfig related to 'simple-bus'
> > compatible
> >>
> >> On Wed, Aug 06, 2008 at 07:41:28AM -0600, Grant Likely wrote:
> >>> On Tue, Aug 05, 2008 at 08:21:31AM -0500, Kumar Gala wrote:
> >>>> I'm trying to get the ppc6xx_defconfig booting on any 8641
> > (74xx/e600)
> >>>> system.  If I remove the 'simple-bus' compatible from the soc
node
> > in
> >>>> the .dts it works.  Otherwise it hangs at but and looks to be
> > crashed in
> >>>> the serial driver due to accessing memory at 0.
> >>>>
> >>>> I've tried the same .dts (w/'simple-bus') using the
> >>>> mpc8641_hpcn_defconfig and things work.
> >>>
> >>> The Xilinx folks hit something similar.  ns16550 nodes get matched
> > if
> >>> the parent claims simple-bus.  If extra stuff needs to be done to
> > use
> >>> that port, then bad things happen.
> >>
> >> If extra stuff needs to be done, it shouldn't claim to be a
> > simple-bus.
> >>
> >> -Scott
> >> _______________________________________________
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> >> Linuxppc-dev@ozlabs.org
> >> https://ozlabs.org/mailman/listinfo/linuxppc-dev
> >
> >
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