[gta02-core] [PATCH] New ECN: Insert 0R resistors into SPI signals

Dave Ball openmoko at underhand.org
Sat Sep 5 23:50:39 CEST 2009

Rask Ingemann Lambertsen wrote:
> The SC32442B SPI interface running at 13 MHz or faster has timing problems[1]
> that we might need to patch up externally. Following ECN0001 (Glamo removal)
> and ECN0034 the SPI interface exposed at the debug connector will now be routed
> to the alternative SPI1 pins of the LCD interface. There is some uncertainty
> about the SPICLK1 signal there[2]. Finally, the SPI1 pins currently routed to the
> accelerometer have EINT capability while the debug connector ones do not, so to
> make better use of EINT pins, we should find out if the two sets of SPI pins can
> be swapped.

I've committed this as an ecn for discussion. 

My feeling is that I'd be happy to add 0R to the new lines we're runing 
to the debug connector (ecn0034), but not on the existing spi lines.  
The accelerometers and WLAN/SPI tests Werner conducted work with the 
existing wiring, and there hasn't been a need to depart from this wiring 
for existing gta02's - so lets leave that as is for -core.

All the best,


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