==== Original message from Stuart Henderson at 13-5-2008 22:15
quoted text
> On 2008-05-13, Daniel Polak <daniel@sys.nl> wrote:
>   
>> I have a system with an IDE hard disk and CF-IDE adapter.
>> The CF-IDE adapter works fine with CF cards of 512 MB capacity and less.
>> As time goes by smaller capacity cards become more difficult to find so 
>> I bought several 1 GB Kingston CF cards.
>>
>> However these CF cards don't seem to work (on OpenBSD 4.3 stable). I 
>> tried three empty 1 GB Kingston CF cards and they all prevent the system 
>> from getting past loading the kernel.
>> I went back to a smaller card and then everything is fine.
>>
>> The error message is
>> type: ata
>> c_bcount: 512
>> c_skip: 0
>> pciide0:1:0: bus-master DMA error: missing interrupt, status=0x21
>>     
>
> Your card supports DMAs, but your adapter doesn't wire the required line.
> This was a later addition to the CF spec, you can disable DMA with flags
> to wd(4).
>
> See http://lists.soekris.com/pipermail/soekris-tech/2007-May/012083.html
>   
Thanks that looks like the cause of my problem!
Only thing is that I have probably have many CF-IDE adapters like this 
and I'd need to use a custom kernel from now on or find enough of the 
older Kingston CF/512 cards that do work.

Daniel