From mboxrd@z Thu Jan  1 00:00:00 1970
From: Rogan Dawes <rogan@dawes.za.net>
Date: Sat, 14 Aug 2010 12:46:09 +0200
Subject: [U-Boot] IDE_BUS unconditionally expects 2 devices per bus
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On 2010/08/14 12:41 PM, Rogan Dawes wrote:
> -#define        IDE_BUS(dev)    (dev>>  1)
> +#define        IDE_BUS(dev)    (dev>>  (CONFIG_SYS_IDE_MAXDEVICE /
> CONFIG_SYS_IDE_MAXBUS - 1))
>
>    #define        ATA_CURR_BASE(dev)
> (CONFIG_SYS_ATA_BASE_ADDR+ide_bus_offset[IDE_BUS(dev)])

Ok, I'm an idiot! The reason was staring me in the face! 
ATA_CURR_BASE(dev) relies on IDE_BUS, which is why the same disk was 
being enumerated twice.

It seems that the above patch is indeed correct.

Rogan