[Soekris] DMA data transfer from CompactFlash
Jun-ichiro itojun Hagino
itojun at itojun.org
Wed Jan 10 07:52:43 UTC 2007
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?
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