[parisc-linux] L2000/N4000 smp devices/boot compare??

[Grant Grundler]

On Fri, Oct 03, 2003 at 01:18:10AM +0100, Matthew Wilcox wrote:
> I once downloaded an N-class PDF which I've subsequently lost.
> If I remember correctly, it looked like:
> 
>      CPU --+-- CPU          RAM          CPU --+-- CPU
>           DEW              |||||              DEW
>   +--------+--------+---- Stretch ----+--------+------+
>  IKE               DEW               DEW             IKE
> |||||         CPU --+-- CPU     CPU --+-- CPU       |||||
> Ropes                                               Ropes
> 
> (Elroys on the end of the ropes, of course).

I thought Ike was hanging off of "Stretch" like this:
   CPU --+-- CPU              RAM             CPU --+-- CPU
        DEW                  |||||                 DEW
         +----------------- Stretch ----------------+
        DEW                  |   |                 DEW
   CPU --+-- CPU           IKE   IKE          CPU --+-- CPU
                       ||...||   ||...||
                      12 ropes   12 ropes

DEW == Runway to Merced bus converter
IKe == I/O Controller (DMA Coherency and IO MMU)

10 PCI slots are "Twin Turbo" (Double Rope) and two are "Turbo" (singl
rope). "Core I/O" gets the remaining two ropes.


However, the original N-class has been replaced with rp7410.
Not sure if when the switchover took place.
rp7410 is now kin to Superdome (HalfDome) and rp8400 (QuarterDome)
and is based on a follow-on chipset.
URL's here:
http://www.hp.com/products1/servers/mid_range/index.html
http://www.hp.com/products1/servers/rackoptimized/rp7410/infolibrary/rp7410_wp.pdf

grant

ps. We are completely under representing the complexity of "RAM" and all
the memory controllers that made this such a hot box 4 years ago.