UCLK

[Cesar Eduardo Barros]

In a message from Ben Dooks on linux-arm-kernel about cpufreq, he said:

 > > - My patches have code to use hardware flow control to "pause" the
 > > serial ports during frequency transitions, so as to not confuse the
 > > GTA01 GSM modem (or Openmoko's gsmd).
 >
 > That is useful for designs that forgot to provide a stable UCLK to
 > provide UART baud clocks... all of the ones that I've had a direct
 > hand in working on feed back or feed in an external known (and stable)
 > clock.

It might be worth considering this on future designs (looking at the 
schematics, GTA01 uses the pin for something else, while GTA02 doesn't 
connect the pin at all).

-- 
Cesar Eduardo Barros
cesarb at cesarb.net
cesar.barros at gmail.com