On Wed, 2009-03-18 at 22:47 +0900, TOMARI Hisanobu wrote: > I thought the short-40pin assumption would cause no problem > considering all models beginning with "PowerBook5" are laptops. > Do you mean an option to toggle this hack on/off should be present > in Kconfig?
Actually, it makes -some- amount of sense to do it by testing specifically for the prefix "PowerBook" and "iBook" without a specific number I suppose. Ben. > Thanks, > TOMARI Hisanobu > > On Wed, 18 Mar 2009 18:58:17 +1100 > Benjamin Herrenschmidt <b...@kernel.crashing.org> wrote: > > > 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
