Free Ultra2 in Silicon Valley, USA

Nathan Whitehorn nwhitehorn at
Fri Nov 14 14:16:23 PST 2008

Marius Strobl wrote:
> On Fri, Nov 14, 2008 at 10:19:33AM -0600, Mark Linimon wrote:
>> It turns out the T1-200s are much happier to boot if you actually
>> include the gem(4) driver in the kernel.
>> Sigh.
>> Anyways, thanks for the help investigating.
> Ah, the problem then likely is that the GEMs are left initialized
> and running by the firmware; at some point, probably when some
> packet is received, the GEM DMAs something to a mapping the
> IOMMU no longer knows about since the kernel has taken it over
> and thus triggers a DMA error interrupt.
> If this happens when netbooting then it's probably time to
> fix libstand to no longer open and close the network device
> for every file access so we can remove the hack form the
> loader which just keeps the device open forever. On the other
> hand, it's probably beneficial in general to not remove the
> driver for the device one wants to netboot with :)
This opening and closing for each file access breaks netbooting on a 
wide range of PowerPC systems as well (ones with gem interfaces, for 
instance). So it would be nice if you could fix loader in an MI way...

More information about the freebsd-sparc64 mailing list