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Date: Thu, 8 Oct 2009 15:24:43 +0200 (CEST)
From: Kjetil Oftedal <oftedal@gmail.com>
To: David Miller <davem@davemloft.net>
Subject: Re: [RFC PATCH 00/12] Merge common OpenFirmware device tree code
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On Wed, 7 Oct 2009, David Miller wrote:

> From: Chris Newport <crn@netunix.com>
> Date: Thu, 8 Oct 2009 02:29:25 +0100 (BST)
>
>> Sun4d has never had SMP support and
>
> Wrong.
>
>> this is apparantly problematic due to Cray interlectual property
>>  causing a lack of bus documentation.
>
> XBUS documentation is not available, but we fully know how to
> program the SBUS interrupt controller and whatnot.  It's all
> there in the sun4d interrupt and SMP support and it did work
> just fine at one point.
>
> Amusingly the SBUS interrupt stuff on sun4d is a very close
> sibling to the IMAP/ICLR scheme used on sun4u.
>

The Sun4d SMP support exists, but is broken in 2.6.
And the UP support is buggy. At least on my test-setup, the
kernel is unable to load userland from scsi-drives.

Dropping the sun4 32-bit SPARC is a bit counterproductive when
considering the resent effort to unify sparc64 and sparc
arch-branches ?