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.woestenb...@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.woestenb...@gmail.com] > > Sent: Wednesday, April 13, 2011 2:52 PM > > To: Felix Radensky > > Cc: Aggrwal Poonam-B10812; linuxppc-...@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 > > <fe...@embedded-sol.com> > > 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.
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