From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sh78.surpasshosting.com (sh78.surpasshosting.com [72.29.64.142]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 1D84DB6FEF for ; Fri, 15 Apr 2011 17:19:19 +1000 (EST) Message-ID: <4DA7F1AC.5030908@embedded-sol.com> Date: Fri, 15 Apr 2011 10:20:12 +0300 From: Felix Radensky MIME-Version: 1.0 To: Kushwaha Prabhakar-B32579 Subject: Re: Problem with mini-PCI-E slot on P2020RDB References: <45903308677306428B6EE7E6FF5A520410D3E6@039-SN1MPN1-004.039d.mgd.msft.net> <071A08F2C6A57E4E94D980ECA553F87417BAF7@039-SN1MPN1-004.039d.mgd.msft.net> In-Reply-To: <071A08F2C6A57E4E94D980ECA553F87417BAF7@039-SN1MPN1-004.039d.mgd.msft.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Cc: "leon.woestenberg@gmail.com" , "linuxppc-dev@ozlabs.org" , Aggrwal Poonam-B10812 List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Hi Poonam, Thanks for the confirmation. Felix. On 04/15/2011 09:27 AM, Kushwaha Prabhakar-B32579 wrote: > Added Linxppc-dev > >> -----Original Message----- >> From: Aggrwal Poonam-B10812 >> Sent: Friday, April 15, 2011 11:47 AM >> To: Felix Radensky >> Cc: Kushwaha Prabhakar-B32579; leon.woestenberg@gmail.com >> Subject: FW: Problem with mini-PCI-E slot on P2020RDB >> >> Hello Felix >> >> We checked with the Board designer, we need the board fixes "mentioned in >> Board errata doc" on the board for this issue. Sorry for the confusion. >> >> The fixes are not present on RevC, also on some RevDs this fix also may >> be absent. >> >> >> Please let us know in case of any issues. >> >> Regards >> Poonam >> >>> -----Original Message----- >>> From: Leon Woestenberg [mailto:leon.woestenberg@gmail.com] >>> Sent: Wednesday, April 13, 2011 2:52 PM >>> To: Felix Radensky >>> Cc: Aggrwal Poonam-B10812; linuxppc-dev@ozlabs.org; Gupta >>> Maneesh-B18878; Kushwaha Prabhakar-B32579 >>> Subject: Re: Problem with mini-PCI-E slot on P2020RDB >>> >>> Felix, >>> >>> On Tue, Apr 12, 2011 at 6:54 AM, Felix Radensky >>> >>> wrote: >>>> On 04/12/2011 07:05 AM, Aggrwal Poonam-B10812 wrote: >>>>> As such there is no hardware fix related to this issue between RevC >>>>> to RevD. The solution was a software patch to resolve the issue >>>>> related to IRQ0. >>>> Are you sure ? Please take a look at Freescale document titled >>>> "P1020E/P2020E RDB System Errata". >>>> There's errata CE10, IRQ0 held low. It is fixed in Rev D. Vivek >>>> Mahajan, who looked at the issue back in 2009, estimated that >>>> problem can be related to missing pull-up on IRQ0. >>>> This is exactly what is >>>> fixed in Rev D. >>>> >>> That's my understanding as well. >>> >>> Check if R420 and R423 are populated. These are the required pull-ups. >>> On Rev D they are populated. You might be able to add them yourself. >>> >>> Even if you have an Rev A-C PCB, this fix can already be applied; it >>> was on my board! (the bottom of the board mentions the schematic >>> revision) >>> >>> The resistors have a silkscreen designator block called X, the >>> resistors are situated to the left and bottom of the silkscreen X. >>> IIRC, between the flash and Px020 part. >>> >>> On the left side of R420 (or R423) I measured the block wave from the >>> RTC, which fires the 32kHz interrupt rate on IRQ0. This fixed by the >>> u- boot patch. >>> >>> Regards, >>> >>> Leon. >