Hello Kushwaha Prabhakar,

Our impression is that there is the same issue on the P1020/P1011 RDB.
Can you confirm this?

Best Regards,
Fabe


2011/4/8 Kushwaha Prabhakar-B32579 [off-list ref]:

quoted

-----Original Message-----
From: Leon Woestenberg [mailto:leon.woestenberg@gmail.com]
Sent: Thursday, April 07, 2011 10:50 PM
To: linuxppc-dev@ozlabs.org
Cc: Kumar Gala; Mahajan Vivek-B08308; Aggrwal Poonam-B10812; Felix
Radensky; Kushwaha Prabhakar-B32579
Subject: Re: Problem with mini-PCI-E slot on P2020RDB

Hello,

On Thu, Dec 17, 2009 at 9:28 PM, Felix Radensky [off-list ref]
wrote:

quoted

Kumar Gala wrote:

quoted

On Dec 17, 2009, at 2:59 AM, Mahajan Vivek-B08308 wrote:

quoted

quoted

Thanks a lot. If I understand you correctly, the only way I can get
ath9k driver to work on this board using legacy interrupts is to
wait for a hardware fix. Right ?

Correct

I'm confused. =A0What's the issue with IRQ0 on the P2020RDB? =A0Is it
used for another purpose?

There's a problem with IRQ0 with respect to mini-PCI-E slot. I have
Atheros wireless card plugged into it. ath9k wireless driver for this
card uses legacy PCI-E interrupts, and I get "irq 16: nobody cared"
message when driver executes request_irq(). Vivek has come to a
conclusion that the problem is related to incorrect IRQ0 routing for
mini-PCI-E slot on P2020RDB.

I would like to understand this issue better, as I seem to be running
into something similar, and it puts my board design on hold.

Can someone (from Freescale) explain what happens if a PCI Express end
point on the mini-PCIe slot raises a legacy interrupt, and where this
goes wrong?

From what document or source code file can I conclude that the PCIe
legacy interrupt is shared with IRQ0?


I found this:

P1020E/P2020E RDB System Errata, Last Update: 2/15/2010:
Problem:IRQ0 held low
Fix: Add 4.7K pull-up (to 3.3.V) for RTC_INT_N.
See R420 in Rev D schematic.
Add 4.7K pull-up (to 3.3.V) for MCU_INT_N.
See R423 in Rev D schematic.

Hello Leon,

=A0Yes you are right, PCIe leagacy interrupt is shared with IRQ0. For Ath=

eros issue.

=A0Can you please try followings, Meanwhile I will try to dig into it.
=A0 http://old.nabble.com/Problem-with-mini-PCI-E-slot-on-P2020RDB-td2680=

2038.html

Regarding sata_sil24, Please see my e-mail on Linux-ide for correct IDSEL=

 value.

Please first try IDSEL value mentioned in email on Linux-ide. Then try th=

is URL..

--Prabhakar

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