RE: hang w/ppc6xx_defconfig related to 'simple-bus' compatible

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: <redacted>

[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:

quoted

On Tue, Aug 05, 2008 at 08:21:31AM -0500, Kumar Gala wrote:

quoted

I'm trying to get the ppc6xx_defconfig booting on any 8641

(74xx/e600)

quoted

quoted

system.  If I remove the 'simple-bus' compatible from the soc node

in

quoted

quoted

the .dts it works.  Otherwise it hangs at but and looks to be

crashed in

quoted

quoted

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

quoted

the parent claims simple-bus.  If extra stuff needs to be done to

use

quoted

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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