I am running FreeBSD 10.3 amd64.

Over the last couple of months, I have made a major upgrade of my 
computer - an upgrade which has knocked out virtually everything except 
the CPU (AMD Athlon X2 270).

In phase 1 (about 2 months ago), I moved the motherboard to a new 
Gigabyte SB970 based board (paired with the the old Athlon CPU) and the 
hard disk to a Samsung EVO 850 SSD

In phase 2 (yesterday), I upgraded other components (new components 
listed) : PSU (Corsair RM650x), RAM (Kingston HyperX, 8 GB, single 
piece), DVD drive (Asus DRW-24D5MT), cabinet (Circle 821).

The USB peripherals remain the same ; mouse, keyboard, printer, scanner.

The USB scanner (Canon MG 2470 Pixma; multi-function device serving 
purely as scanner) is the one that is of most interest.

After phase 2 of the upgrade was over, I have been facing this situation 
(since yesterday) :

If I run 'scanimage -L' as root on the console at ttyv4 (no X), most of 
the times it returns with a listing of the Canon scanner. At the same 
time, on ttyv0, I also get the following diagnostics :

ata0: FAILURE - odd-sized DMA transfer attempt 5 % 2
ata0: setting up DMA failed

Once in about 2-3 tries, the command actually gets totally stuck. Not 
even Control-C wakes it up. In such cases, the system usually has to be 
rebooted - sometimes forcibly by hard-pressing the switch on the cabinet.

Further, at the time I boot, I sometimes also see the following 
diagnostics on ttyv0 :

(ada0:ata0:0:1:0): READ_DMA48. ACB: 25 00 df ea ff 40 33 00 00 00 01 00
(ada0:ata0:0:1:0): CAM status: Command timeout
(ada0:ata0:0:1:0): Retrying command

The last time I spotted the above error ("CAM status: Command timeout") 
was in a single user shell running fsck after an unclean shutdown. No 
other command except fsck and reboot was given to the system during that 

I am trying to determine whether the errors I am facing are a problem 
with the hardware; with the kernel; or with the USB code. The only other 
thing notable I can add is the USB scanner works seamlessly under 
Windows XP (which serves as my second OS on my dual-boot machine).

If anybody can help me determine what is wrong with the system, I shall 
be highly grateful - I feel practically paralysed after investing so 
much time, money and energy upgrading the hardware, only to be feeling 
as if now I am stuck in no man's land.

Manish Jain
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