On Wed, 2009-03-18 at 14:06 +0900, TOMARI Hisanobu wrote: > Hello, > > I'm using an OCZ PATA SSD on Apple PowerBook5,4 computer. > The IDE drive fails to recognize 80-conductor cable that > connects the drive to motherboard to fall back to UDMA33. > > This patch fixes this behavior by assuming that the cable is > short-40pin when the model string matches "PowerBook5" and > the motherboard detects 80c cable. > > This patch is against drivers/ide/pmac.c in linux 2.6.28.8.
The patch is too much of an ad-hoc hack... _maybe_ an option is to make the core fallback to 40 "short" when 80 pin detection fails on powerbooks instead ? Ben. > (before applying the patch) hdparm -i /dev/hda > /dev/hda: > Timing buffered disk reads: 90 MB in 3.03 seconds = 29.73 MB/sec > (dmesg 2.6.26) > ide0: Found Apple UniNorth ATA-6 controller, bus ID 3, irq 39 > Probing IDE interface ide0... > hda: CORE_PATA, ATA DISK drive > hda: host max PIO4 wanted PIO255(auto-tune) selected PIO4 > hda: drive side 80-wire cable detection failed, limiting max speed to UDMA33 > hda: UDMA/33 mode selected > > (after applying the patch) hdparm -i /dev/hda > /dev/hda: > Timing buffered disk reads: 240 MB in 3.02 seconds = 79.42 MB/sec > (dmesg 2.6.28.8) > ide-pmac: Found Apple UniNorth ATA-6 controller (PCI), bus ID 3, irq 39 > Probing IDE interface ide0... > hda: CORE_PATA, ATA DISK drive > hda: host max PIO4 wanted PIO255(auto-tune) selected PIO4 > hda: UDMA/100 mode selected > ide0 at 0xf102a000-0xf102a070,0xf102a160 on irq 39 > > > _______________________________________________ > Linuxppc-dev mailing list > Linuxppc-dev@ozlabs.org > https://ozlabs.org/mailman/listinfo/linuxppc-dev _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev