| EFA(4) | Device Drivers Manual (amiga) | EFA(4) | 
efa —
efa0 at mainbus0
efa driver provides support for the FastATA 1200
  family of IDE controllers and provides the interface with the hardware for the
  ata(4) driver. PIO modes 0, 3, 4
  and 5 are supported.
efa driver supports the following hardware:
efa device first appeared in NetBSD
  6.0.
efa driver was written by Radoslaw
  Kujawa
  <radoslaw.kujawa@gmail.com>.
These devices do not generate hardware interrupts and need to be driven in non-standard polling mode. Code needed to support it is present in driver but does not work correctly.
Some of the above devices were also marketed under PowerFlyer and Winner brands.
The onboard Gayle IDE controller can not be used when FastATA is
    installed and therefore, the efa driver will not
    coexist with wdc(4) driver
    attached to mainbus(4).
    Both efa and
    wdc(4) can be enabled in the
    same kernel, but only one will attach (depending on the return value of
    probe function in the efa driver).
DMA modes are not supported, this is a hardware limitation.
Disks partitioned in split mode, which is specific to official AmigaOS FastATA driver, are not recognized in NetBSD.
| April 13, 2012 | NetBSD 9.4 |