On Wednesday 13 May 2009 20:01:31 bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=13286 > > > > > > --- Comment #4 from fibre_optic@xxxxxx 2009-05-13 18:01:31 --- > "Does 2.6.27.21 use DMA?" > > Here is part of dmesg output from 2.6.27.21: > ... > platform rtc_cmos: registered platform RTC device (no PNP device found) > squashfs: version 3.4 (2008/08/26) Phillip Lougher > msgmni has been set to 498 > io scheduler noop registered (default) > pci 0000:00:01.0: Boot video device > brd: module loaded > Uniform Multi-Platform E-IDE driver > ide_generic: please use "probe_mask=0x3f" module parameter for probing all > legacy ISA IDE ports > Probing IDE interface ide0... > hda: SanDisk SDCFJ-32, CFA DISK drive This kernel is using ide_generic host driver which doesn't support DMA instead of piix one (it explains why 2.6.27.21 works and 2.6.29.3 doesn't). > "Unfortunately there is no software method to check it so > you need to look at PCB and verify if there are any routes > connected to pins 21 and 29 (DMARQ and -DMACK lines)." > > Take a look at attached pictures. Do they help to figure this out? No DMA lines... this is hardware problem -- you can workaround it with "ide_core.nodma=0.0" boot parameter (see Documentation/ide/ide.txt for more details on ide parameters). I'm closing the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
