Problem with mini-PCI-E slot on P2020RDB
fabeisageek at googlemail.com
Mon Apr 11 18:23:23 EST 2011
Hello Kushwaha Prabhakar,
Our impression is that there is the same issue on the P1020/P1011 RDB.
Can you confirm this?
2011/4/8 Kushwaha Prabhakar-B32579 <B32579 at freescale.com>:
>> -----Original Message-----
>> From: Leon Woestenberg [mailto:leon.woestenberg at gmail.com]
>> Sent: Thursday, April 07, 2011 10:50 PM
>> To: linuxppc-dev at 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
>> On Thu, Dec 17, 2009 at 9:28 PM, Felix Radensky <felix at embedded-sol.com>
>> > Kumar Gala wrote:
>> >> On Dec 17, 2009, at 2:59 AM, Mahajan Vivek-B08308 wrote:
>> >>>> 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. What's the issue with IRQ0 on the P2020RDB? Is 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,
> Yes you are right, PCIe leagacy interrupt is shared with IRQ0. For Atheros issue.
> Can you please try followings, Meanwhile I will try to dig into it.
> 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 this URL..
> Linuxppc-dev mailing list
> Linuxppc-dev at lists.ozlabs.org
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