Problem with mini-PCI-E slot on P2020RDB

[Kushwaha Prabhakar-B32579]

Hi,

Yes. It wil be applicable for all revisions. 

Regards,
Prabhakar

> -----Original Message-----
> From: Felix Radensky [mailto:felix at embedded-sol.com]
> Sent: Monday, April 11, 2011 2:10 PM
> To: Kushwaha Prabhakar-B32579
> Cc: Fabian Bertholm; Leon Woestenberg; linuxppc-dev at ozlabs.org; Mahajan
> Vivek-B08308; Aggrwal Poonam-B10812; Gupta Maneesh-B18878
> Subject: Re: Problem with mini-PCI-E slot on P2020RDB
> 
> Hi,
> 
> Assuming I have all patches in place, will this problem be resolved on
> earlier board revisions (before rev D) ?
> 
> Felix.
> 
> On 04/11/2011 12:06 PM, Kushwaha Prabhakar-B32579 wrote:
> > Hi Fabe,
> >
> > Yes .. P1020/P1011 RDB has same issue as of P2020RDB.
> >
> > It was because of some missing patches at u-boot and Linux.
> >
> > U-boot patch : It is already present in open source. Please use latest
> > code base Linux patch : I am in process of posting in open source.
> Please make mentioned changes of IDSEL.
> >
> > --Prabhakar
> >
> >> -----Original Message-----
> >> From: Fabian Bertholm [mailto:fabeisageek at googlemail.com]
> >> Sent: Monday, April 11, 2011 1:53 PM
> >> To: Kushwaha Prabhakar-B32579
> >> Cc: Leon Woestenberg; linuxppc-dev at ozlabs.org; Mahajan Vivek-B08308;
> >> Felix Radensky; Aggrwal Poonam-B10812; Gupta Maneesh-B18878
> >> Subject: Re: Problem with mini-PCI-E slot on P2020RDB
> >>
> >> 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<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
> >>>>
> >>>> Hello,
> >>>>
> >>>> On Thu, Dec 17, 2009 at 9:28 PM, Felix Radensky
> >>>> <felix at embedded-sol.com>
> >>>> wrote:
> >>>>> 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.
> >>>
> >>> http://old.nabble.com/Problem-with-mini-PCI-E-slot-on-P2020RDB-td268
> >>> 02
> >>> 038.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
> >> this URL..
> >>> --Prabhakar
> >>>
> >>> _______________________________________________
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> >>> Linuxppc-dev at lists.ozlabs.org
> >>> https://lists.ozlabs.org/listinfo/linuxppc-dev
> >>>
> >