Are you trying to use the IDE interface on the A2091 with a CF card? If so it won't work:
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A little-known and mostly-unused function of the A2091 is a built-in XT-IDE controller. The IDE connector and LED are not installed, but visible on the board to the left and upper-right of the SCSI chip. Unfortunately, this port will only work with 8-bit (XT) IDE hard drives, not the common 16-bit AT-IDE hard drives. This option was apparently mostly used for the 20M drives supplied with the A590, the A500 hard disk option which shared the 2091 design.
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here
Or if is the IDE interface on a separate card (in which case might be issues with scsi.device compatibility).