64-bit Malta Kernel/Userland/Toolchain?

Hello, All.
Subject is quite discussed at length. However my
target is slightly different.
After Malta4Kc is running for me, I'm looking into
64-bit port. I've MIPS 20Kc for next couple of weeks.
From last 2 days I was trying to bring up the Bonito64
part. Now, including PCI detection & access to some of
the devices I'm able to move the kernel. 
Since I am new to NetBSD development I've couple of
doubts.
.1 TOOLCHAIN: Currently I'm using the lastest (March
27?) build of cross mipseb toolchain. I do "config
MALTA" with MIPS32 & MIPS64 both. Is this all ok? How
to build entire 64bit kernel??
.2 USERLAND: Since sgimips did work for me on Malta4Kc
I guess it will work with this board too. Anyway,
where to get the all 64bit userland?
.3 KERNEL: Many features of 20Kc are expected to
enhance total performance. Is there anybody already
working on this particular port? I'm very much
interested in this port. It'd be great if we start
disucussing about it. Especially about the toolchain &
the port in detail.
Ofcourse looking at the responses that I did *not* get
it is quite disappointing, sometimes. Let us keep this
list active.
Many thanks.
Girish.


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