[Soekris] DMA data transfer from CompactFlash

[Jun-ichiro itojun Hagino]

	I got two Soekris 4801 devices:
	- purchased 2003/8 (A)
	- purchased 2007/1 (B)
	both has latest bios, 1.28.

	also I have two 1G CF cards from SanDisk.
	- purchased 2003 (alpha)
	- purchased 2007 (beta)

	i am experiencing strange symptoms.

	- alpha can only do PIO transfers.  beta can do DMA transfers as well.
	- both alpha and beta works fine on B.
	- alpha works fine on A.  beta chokes on B due to trouble with DMA
	  transfers (OpenBSD automatically degrades access to PIO transfer,
	  also i have disabled DMA tranfer by kernel configuration).

	are there any hardware changes wrt IDE interface between A and B?

itojun