On 02/08/07, Mark Lord <lkml@xxxxxx> wrote: > Daniel J Blueman wrote: > > On 02/08/07, Tejun Heo <htejun@xxxxxxxxx> wrote: > >> Daniel J Blueman wrote: > >>> I'll grab kernel logs from the legacy ATA boot; what else can help > >>> debug this issue? No problem testing patches too. > >> Yeap, please post the old log. > > > > Not much actually - perhaps I need to enable some debugging: > > > > Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2 > > ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx > > hdc: SanDisk SDCFX-4096, CFA DISK drive > > ide1 at 0x170-0x177,0x376 on irq 15 > > hdc: max request size: 128KiB > > hdc: 8027712 sectors (4110 MB) w/1KiB Cache, CHS=7964/16/63 > > hdc: hdc1 hdc2 hdc3 > > > >>> --- [2] > >>> ata2.00: limiting speed to UDMA/33:PIO4 > >>> ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen > >>> ata2.00: cmd c8/00:08:00:00:00/00:00:00:00:00/e0 tag 0 cdb 0x0 data 4096 in > >>> res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) > >>> ata2: soft resetting port > >>> ata2.00: configured for UDMA/33 > >>> ata2: EH complete > >> What happens after this? > > > > More EH occurs - I've left it for ~5 mins, but let me know if longer > > would give more information, eg if it converges on a lower speed. > > > > Would it be useful to compare some of the port setup registers in the > > working and non-working cases? Or any other debug I can grab? > > I'm betting that this is the exact same problem we recently debugged > for someone else here: there's a Marvell PATA->SATA bridge chip between > that CF card and the SATA controller, and it only works with PIO modes. > > Tejun.. perhaps (for debugging) a simple patch to disallow DMA completely, > just to see if PIO works? The ICH8 south-bridge I have is the mobile variant and does come equipped with native parallel IDE - see page 447: http://download.intel.com/design/chipsets/datashts/31305603.pdf . I do see 35MB/s with DMA enabled from my CF on the 1 in 15 times the libata-kernel does work. I can dump off and decode the configuration registers for the timing and bus master registers in the working and non-working libata cases, and the legacy ATA working case and see what's different. Dan -- Daniel J Blueman - 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
