Hi,

I updated my current kernel from March 8 version to today's
version.  Newer kernel detects PROMISE Ultra 100 card and
Max60 (ATA100 support) combination as Ultra-DMA mode 5
(Ultra/100).  That's great.  However, then, it finds CRC
errors and doesn't work well after automatic downgrading of
DMA mode.  Moreover, it downgrade from UDMA5 to 2 directly.
;-)

This combination works fine as UDMA 100 under Win98/Win2k.
It also works fine as Ultra DMA mode 4 (Ultra/66) with a
kernel before March 8.  Does it works fine on Ultra 100 card
and other hard disks configuration?


Messages about devices and errors are below:

pciide1 at pci0 dev 10 function 0: Promise Ultra100/ATA Bus Master IDE Accelerator (rev. 0x02)
pciide1: bus-master DMA support present
pciide1: primary channel configured to native-PCI mode
pciide1: using irq 12 for native-PCI interrupt
wd1 at pciide1 channel 0 drive 0: <Maxtor 96147U8>
wd1: drive supports 16-sector PIO transfers, LBA addressing
wd1: 58623 MB, 16383 cyl, 16 head, 63 sec, 512 bytes/sect x 120060864 sectors
wd1: 32-bit data port
wd1: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100)
wd1(pciide1:0:0): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA data transfers)


Kernelized RAIDframe activated
wd1: transfer error, downgrading to Ultra-DMA mode 2
wd1(pciide1:0:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA data
transfers)
wd1d: aborted command, interface CRC error reading fsbn 0 (wd1 bn 0; cn 0 tn 0 sn 0), retrying
pciide1:0:0: lost interrupt
        type: ata tc_bcount: 512 tc_skip: 0
pciide1:0:0: bus-master DMA error: missing interrupt, status=0x21
wd1: transfer error, downgrading to Ultra-DMA mode 1
wd1(pciide1:0:0): using PIO mode 4, Ultra-DMA mode 1 (using DMA data transfers)
wd1d: DMA error reading fsbn 0 (wd1 bn 0; cn 0 tn 0 sn 0), retrying
pciide1:0:0: lost interrupt
        type: ata tc_bcount: 512 tc_skip: 0
pciide1:0:0: bus-master DMA error: missing interrupt, status=0x21
wd1: transfer error, downgrading to PIO mode 4
wd1(pciide1:0:0): using PIO mode 4
wd1d: DMA error reading fsbn 0 (wd1 bn 0; cn 0 tn 0 sn 0), retrying
wd1: soft error (corrected)
pciide1:1:0: lost interrupt
        type: ata tc_bcount: 512 tc_skip: 0
pciide1:1:0: bus-master A error: missing interrupt, status=0x21
wd2: transfer error, downgrading to Ultra-DMA mode 2
wd2(pciide1:1:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA data transfers)
...

Regards,
-- Kazushi
Down with categorical imperative!