legacy_serial identifies a valid ns16550 on a simple-bus, but the
legacy_serial driver doesn't understand the shift and offset flags
necessary to get it to work, which results in no console.

I think the easiest solution is to change the Kconfig so that
PPC_UDBG_16550 is only selected based on !XILINX_VIRTEX.  I've done this
in my tree, but I've been swamped with other things at the moment, so I
haven't verified it.

Or is legacy_serial just legacy at this point and can go away entirely?
I got the impression from some of the earlier discussion that it wasn't
preferred, at least....

Steve

-----Original Message-----
From: glikely@secretlab.ca [mailto:glikely@secretlab.ca] On Behalf Of

Grant Likely

Sent: Friday, June 06, 2008 8:29 AM
To: Stephen Neuendorffer
Cc: dwg@au1.ibm.com; jwboyer@linux.vnet.ibm.com;

linuxppc-dev@ozlabs.org; git

Subject: Re: [PATCH] [POWERPC] Xilinx: add compatibility for

'simple-bus'.

=

On Tue, Jun 3, 2008 at 3:41 PM, Stephen Neuendorffer
[off-list ref] wrote:

quoted

It appears that this turns out to interact badly with the probing of
PPC_UDBG_16550, which is always enabled on PPC405 (and apparently
found!) even though Virtex devices don't have them.

=

What is the symptom?
=

g.
=

quoted

Steve

quoted

-----Original Message-----
From: Stephen Neuendorffer [mailto:stephen.neuendorffer@xilinx.com]
Sent: Thursday, May 08, 2008 11:25 AM
To: dwg@au1.ibm.com; jwboyer@linux.vnet.ibm.com;

grant.likely@secretlab.ca; linuxppc-dev@ozlabs.org

quoted

Cc: Stephen Neuendorffer
Subject: [PATCH] [POWERPC] Xilinx: add compatibility for

'simple-bus'.

quoted

quoted

ePAPR drafts propose 'simple-bus' as a generic compatibility type

for

quoted

quoted

busses which cannot be probed for devices.  In addition, the Xilinx
versions of these IPs seem to be proliferating.  Hence, in the

future

quoted

quoted

let's prefer to use the standard names.  I've left the old names in
for short term backward compatibility for existing device trees.

Signed-off-by: Stephen Neuendorffer

[off-list ref]

quoted

quoted

---
 arch/powerpc/platforms/40x/virtex.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/platforms/40x/virtex.c

b/arch/powerpc/platforms/40x/virtex.c

quoted

index 6c72994..b1ab7b8 100644

--- a/arch/powerpc/platforms/40x/virtex.c
+++ b/arch/powerpc/platforms/40x/virtex.c

@@ -16,6 +16,7 @@
 #include <asm/xilinx_intc.h>

 static struct of_device_id xilinx_of_bus_ids[] __initdata =3D {
+     { .compatible =3D "simple-bus", },
      { .compatible =3D "xlnx,plb-v46-1.00.a", },
      { .compatible =3D "xlnx,plb-v46-1.02.a", },
      { .compatible =3D "xlnx,plb-v34-1.01.a", },
--

1.5.3.4

=

--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.

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