Problem with mini-PCI-E slot on P2020RDB

[Kushwaha Prabhakar-B32579]

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-td26802
> > 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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> >