FreeBSD-10 microdrive seagate ST1AT 4GB (VIA mbo) problem

[Ian Lepore]

On Wed, 2013-11-20 at 21:27 +0100, Berislav Purgar wrote:
> Hello ..
> 
> I have problem with microdrive and some CF cards on IGEL 3/4 compact thin
> client ( http://www.parkytowers.me.uk/thin/Igel/3210/index.shtml ). Problem
> is that FreeBSD cannot find microdrive or CF card to mount sytem / on (but
> kernel is found and loaded from microdrive or CF card). I have one CF card
> (sandisk ultra II) which boots but with some timeouts before. Here are
> links to pictures of this problem.
> 
> (aprobe:ata0:0:0:0): ATA_IDENTIFY. ACB: ec 00 00 00 00 40 00 00 00 00 00 00
> 
> 
> http://s24.postimg.org/al2k6qfzp/WP_20131120_003_1.jpg
> http://s17.postimg.org/wm0s58kzz/WP_20131120_007_1.jpg
> http://s23.postimg.org/5sp2k4trf/WP_20131120_006_1.jpg
> 
> i tried same configuration on openbsd5.3 and everething si Ok .. Any
> suggestions ?
> 
> Tnx
> sorry for my English ..

Try adding hw.ata.ata_dma=0 to your /boot/loader.conf.  I don't know why
the bios can do DMA on a CF and freebsd can't, but we've needed to add
that at $work for years (going back to freebsd 4.x at least).  Of
course, you pay a huge performance penalty for running in PIO mode.

-- Ian