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

[Kumar Gala]

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=xilinx.com at ozlabs.org
> [mailto:linuxppc-dev-
>> bounces+stephen.neuendorffer=xilinx.com at ozlabs.org] On Behalf Of  
>> Scott
> Wood
>> Sent: Wednesday, August 06, 2008 10:36 AM
>> To: grant.likely at secretlab.ca
>> 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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