stpcide —
STMicroelectronics STPC IDE disk controllers driver
stpcide* at pci? dev ? function ? flags 0x0000
The stpcide driver supports the STMicroelectronics STPC
  x86 SoC internal IDE controllers, and provides the interface with the hardware
  for the ata(4) driver. The driver
  features DMA mode 2 and PIO mode 4 transfer speeds.
The 0x0002 flag forces the stpcide driver
    to disable DMA on chipsets for which DMA would normally be enabled. This can
    be used as a debugging aid, or to work around problems where the IDE
    controller is wired up to the system incorrectly.
The timings used for the DMA and PIO modes are for STPC Atlas and its siblings
  with their PCI clock configured at 33 MHz. Other speeds including the STPC
  Vega Ultra-IDE controller will need adjustments.