Yokemate of Keyboards
Posts: 11462 from 2003/5/22
> I wonder why the people responsible for making the design decisions for
> the final X1000 motherboard design ignored Paul's advice to stay away from
> the PA6T and look at using one of the QorIQ chips instead?
It's easy to understand if you look a the timeline:
- Early 2008: A-Eon's decision for the PA6T is made by the OS4 developers (as requested by A-Eon)
- Early 2009: actual development of Nemo board commences at Varisys
- April 2010
: Paul Gentle of Varisys discourages from using the PA6T for new designs
: Paul Gentle of Varisys recommends QorIQ
If you then add to this that the first somewhat suitable QorIQ CPU (P4080) started sampling in August 2009
, your question should be answered in full.
You can find more information (e.g. on the viable CPU options besides PA6T back then), links and Trevor's confirmation there:
> Perhaps the only reason was because using one of the QorIQ chips would have meant
> giving up PCIe lanes
While the matter of PCIe lane quantity is a valid one, I believe the reasons stated above outweigh it by far.
> and also meant further delays in completing the X1000 project.
At least delays in commencing, as with QorIQ instead of PA6T, the actual board development would have started at least 6 to 12 months later than it had with the PA6T. And this with a slower CPU (per core), no AltiVec and less PCIe lanes. Whether QorIQ would have meant less problems during the design process, I don't know.