Hi Michael, What's the logic relationship between the CF/ATA signals and signals to blackfin you set in the CPLD? Even after we connect a 1000Ohm res to ground, the interrupt output to blackfin is still high. It seems the CPLD is outputing high but not keep tristate in default status. So we have to keep the probe-polling patch until the CPLD logic is fixed. Thanks Barry
-----Original Message----- From: Hennerich, Michael [mailto:[email protected]] Sent: Friday, July 10, 2009 11:18 PM To: Mike Frysinger Cc: [email protected]; [email protected] Subject: RE: [Linux-kernel-commits] [6960] trunk/drivers/ata/libata-core.c: 1. >it sounds like we just have to pop off a resistor ? Well not that easy - I used a 0603 type 10k Resistor Pack including 4 resistors. One trick could be to leave the PULL-Ups as is and add a stronger Pull-Down to the INTRQ - lets say something between 500 Ohm and 1kOhm . -Michael >-----Original Message----- >From: Mike Frysinger [mailto:[email protected]] >Sent: Friday, July 10, 2009 5:07 PM >To: Hennerich, Michael >Cc: [email protected]; [email protected] >Subject: Re: [Linux-kernel-commits] [6960] trunk/drivers/ata/libata-core.c: 1. > >On Fri, Jul 10, 2009 at 11:00, Hennerich, Michael wrote: >> I think this issue is caused by a Pull-Up resistor on the INTRQ line on >> the CF-IDE-NAND Card. >> >> Read this: >> http://www.mail-archive.com/[email protected]/msg00418.html >> >> On the CF Card socket we also have that pull-up - but there we had no >> choice since in PC-Card IO mode the Interrupt is asserted Low. So this >> was a tradeoff, and at the time doing the card - it worked without >> errors. >> >> The problem here is that the INTRQ signal output line has a high >> impedance when no devices are selected or interruption is disabled. >> >> Like you noticed, recent Linux libata assumes the INTRQ staying inactive >> the time between the IRQ is requested and the device is configured. >> >> If this fix isn't acceptable to mainline we should revert - and fix the >> HW. > >can the simple instructions of how to patch the card be added to the >wiki ? it sounds like we just have to pop off a resistor ? >-mike
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