Quoting Izumi Tsutsui <tsutsui@ceres.dti.ne.jp>:

> rumble@NetBSD.org wrote:
>
>> Module Name:	src
>> Committed By:	rumble
>> Date:		Sat Dec 23 21:24:32 UTC 2006
>>
>> Modified Files:
>> 	src/sys/dev/pci: if_tl.c
>>
>> Log Message:
>> The Set Engineering GIO board for sgimips (IP22) sits behind a special
>> bridge that precludes the ThunderLAN's DMA engine from performing segment
>> transfers across page boundaries. Add logic under #ifdef TL_SETENG_GFE to
>> split up these segment transfers appropriately.
>
> - This #ifdef should be replaced by prop_dictionary
>   (see dev/pci/ahc_pci.c and sgimips/autoconf.c)
> - I think this boundary restriction could be handled by an arg of
>   bus_dmamap_create(9) and you don't have to split segments manually

Ah, excellent. This is much better -- I'll make the appropriate  
changes right now!

Steve