I've tried using the CD drive on a couple of Blade 100's but have been
unable to access it.  On one machine, the CD is the only IDE device on
the primary controller (it is jumpered to master) and on the other, the
CD is the slave device to a hard drive.  Dmesg looks like:

  cd0 at atapibus0 drive 1: <LTN485S, , JOU2> cdrom removable
  cd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
  wd0 at atabus0 drive 0: <ST315320A>
  wd0: drive supports 16-sector PIO transfers, LBA addressing
  wd0: 14594 MB, 29651 cyl, 16 head, 63 sec, 512 bytes/sect x 29888820 sectors
  wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 4 (Ultra/66)
  wd0(aceride0:0:0): using PIO mode 4, Ultra-DMA mode 4 (Ultra/66) (using DMA)
  cd0(aceride0:0:1): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)

When I try to access the CD (e.g. disklabel, eject), I see:

  aceride0:0:1: lost interrupt
        type: atapi tc_bcount: 32 tc_skip: 0
  aceride0:0:1: bus-master DMA error: missing interrupt, status=0x61
  aceride0:0:1: device timeout, c_bcount=32, c_skip=0
  cd0: transfer error, downgrading to Ultra-DMA mode 1
  wd0(aceride0:0:0): using PIO mode 4, Ultra-DMA mode 4 (Ultra/66) (using DMA)
  cd0(aceride0:0:1): using PIO mode 4, Ultra-DMA mode 1 (using DMA)
  cd0(aceride0:0:1): generic HBA error
  wdc_atapi_intr: bad data phase DATAIN
    (repeats 13 times)

The same happens on the machine with just the CD drive (although the errors
apply to aceride0:0:0).  I've tried replacing the IDE cable and the drive.

This happens on both 3.0.1 and 3.99.21.  There are no problems accessing the
hard drive (wd0).

If I try a kernel that disables DMA for the CD, it works perfectly using
PIO.  Is this a driver or a CD drive problem?

Thanks,

J

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