Can't access both CD-RW and DVD-ROM

[Jules Dubois <pwfsm8z02@sneakemail.com>]

I'm running sid, with a custom 2.6.7 kernel which I build with make-kpkg.

I used to be able to access my (ATAPI) CD-RW but after I fooled around to 
make my (SCSI) DVD-ROM drive work, I can't access the ATA adapter at all.

Here's a diff showing all the changes between the two configurations. 
Under the old configuration, the CD-RW works.

  @@ -242,10 +242,10 @@
  -CONFIG_BLK_DEV_IDECD=m
  +CONFIG_BLK_DEV_IDECD=y
   # CONFIG_BLK_DEV_IDETAPE is not set
   # CONFIG_BLK_DEV_IDEFLOPPY is not set
  -CONFIG_BLK_DEV_IDESCSI=m
  +# CONFIG_BLK_DEV_IDESCSI is not set
  @@ -313,7 +313,7 @@
  -# CONFIG_SCSI_CONSTANTS is not set
  +CONFIG_SCSI_CONSTANTS=y
  -CONFIG_LEGACY_PTYS=y
  -CONFIG_LEGACY_PTY_COUNT=256
  +# CONFIG_LEGACY_PTYS is not set

Under the new configuration only, the kernel gives this error

  root:~# hdparm -i /dev/hdc
  /dev/hdc: No such device or address

but it works properly under the old configuration.

What did I hose?