From owner-freebsd-embedded@FreeBSD.ORG  Fri Feb 23 23:49:22 2007
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Date: Fri, 23 Feb 2007 16:47:08 -0700 (MST)
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To: phocking@hockingits.com
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: freebsd-embedded@freebsd.org
Subject: Re: NanoBSD 6.2 Stable fails to mount filesystem on MikroTik
 RouterBOARD 230
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In message: <45D8E3B0.6080909@hockingits.com>
            Phill Hocking <phocking@hockingits.com> writes:
: Greetings. I am having issues with my NanoBSD images failing to boot 
: that seemed to start in 6.1.
: 
: RTC BIOS diagnostic error 20<config_unit>
: 
: Timecounters tick every 1.000 msec
: 
: ad0: 488MB <SanDisk SDCFB-512 HDX 3.15> at ata0-masstray irq7
: 
: ad0: TIMEOUT - READ_DMA retrying (1 retry left) LBA=0
: ad0: TIMEOUT - READ_DMA retrying (0 retries left) LBA=0
: ad0: FAILURE - READ_DMA timed out LBA=0
: ad0: TIMEOUT - READ_DMA retrying (1 retry left) LBA=0
: ad0: TIMEOUT - READ_DMA retrying (0 retries left) LBA=0
: ad0: FAILURE - READ_DMA timed out LBA=0
: ad0: TIMEOUT - READ_DMA retrying (1 retry left) LBA=1
: ad0: TIMEOUT - READ_DMA retrying (0 retries left) LBA=1
: ad0: FAILURE - READ_DMA timed out LBA=1
: ad0: TIMEOUT - READ_DMA retrying (1 retry left) LBA=0
: ad0: TIMEOUT - READ_DMA retrying (0 retries left) LBA=0
: ad0: FAILURE - READ_DMA timed out LBA=0
: Trying to mount root from ufs:/dev/ad0s1a
: 
: I've tried several different flash carts, and my old 5x images work, so 
: what should I do?

Add:
hw.ata.ata_dma=0
to /boot/loader.conf

This may be a case where a new DMA CF part is in an old non-DMA
adapter...  But I'd expect to see that with 4.x and 5.x too, but it
can't hurt to try.

Warner