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

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.

Any one got any ideas?

- k

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.

g.

On Aug 6, 2008, at 8:41 AM, Grant Likely wrote:

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)
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.

did they have a fix?

 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.

"extra stuff".. not sure what you mean.  I'm guessing you me other config for the port to work.  In my case that isn't the situation.

- k

On Wed, Aug 06, 2008 at 08:47:29AM -0500, Kumar Gala wrote:

On Aug 6, 2008, at 8:41 AM, 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)
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.

did they have a fix?

Yes, they added code to check another property.  If the reg-shift or
reg-offset properties were present, then it didn't try to use the port

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:

quoted

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

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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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

quoted

-----Original Message-----
From: <redacted>

[mailto:linuxppc-dev-

quoted

bounces+stephen.neuendorffer=xilinx.com@ozlabs.org] On Behalf Of Scott

Wood

quoted

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

quoted

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

quoted

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

in

quoted

quoted

quoted

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

crashed in

quoted

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

quoted

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

use

19 more quoted lines

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:
=

quoted

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

quoted

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

quoted

-----Original Message-----
From:

linuxppc-dev-bounces+stephen.neuendorffer=3Dxilinx.com@ozlabs.org

quoted

[mailto:linuxppc-dev-

quoted

bounces+stephen.neuendorffer=3Dxilinx.com@ozlabs.org] On Behalf Of
Scott

Wood

quoted

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

quoted

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

quoted

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

node

quoted

in

quoted

quoted

quoted

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

crashed in

quoted

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

quoted

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

use

quoted

quoted

that port, then bad things happen.

If extra stuff needs to be done, it shouldn't claim to be a

simple-bus.

quoted

-Scott
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-dev

This email and any attachments are intended for the sole use of the
named recipient(s) and contain(s) confidential information that may
be proprietary, privileged or copyrighted under applicable law. If
you are not the intended recipient, do not read, copy, or forward
this email message or any attachments. Delete this email message and
any attachments immediately.


_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-dev

=

_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-dev

This email and any attachments are intended for the sole use of the named r=
ecipient(s) and contain(s) confidential information that may be proprietary=
, privileged or copyrighted under applicable law. If you are not the intend=
ed recipient, do not read, copy, or forward this email message or any attac=
hments. Delete this email message and any attachments immediately.

On Wed, Aug 6, 2008 at 11:35 AM, Scott Wood [off-list ref] wrote:

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)
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.

Heh, no, not the bus.  :-)  Extra stuff to use the serial device.

g.