Am 07.02.2014 um 07:56 schrieb Dr. H. Nikolaus Schaller:
Hi, after someone sent me the links to the data sheets, I must say I am impressed by the Atom Z3770. It indeed looks as if it is really comparable - concerning interfaces.
One issue is that it is a 1300+ BGA in 0.4mm pitch while the OMAP5432 is 0.5mm (the 5430 would also be 0.4). So the system design of the 5432 is a little relaxed (being 20% more spacy).
With the Snapdragon discussions we now (again) have indeed three options to consider.
Maybe the best one to strive for would be replaceable CPU boards for all of them :)
This of course needs:
- well defined interface connectors (positions, signals)
- makes planning more difficult (we need to know in advance which versions in which quantities)
- reduced number of units per variant - increasing the total price a little
- we have to maintain 2 or 3 kernels + drivers
One solution could be that we only do step 1, publish some interface specifications and leave it to others to really design, build and maintain the alternate SoC boards.
So my proposal would be to continue with OMAP5 (because we know it best) and leave the Snapdragon and Atom designs to the community (but help them to succeed if possible).
BR, Nikolaus
PS: after studying the data sheets a little - the 1V Core power line may draw up to 6 Amperes (!) This is a special challenge for the power controller design _______________________________________________ Kernel mailing list Kernel@pyra-handheld.com http://pyra-handheld.com/cgi-bin/mailman/listinfo/kernel
To help discussions/documentation I have sketched a Score Sheet:
If you think this is useful to document and communitcate a decision (well, there is always an arbitrary and discussable component inside), we could fill in the missing pieces and ED could define the Importance (because one person must do that).
BR, Nikolaus