missing clock prescaler setting for ATmega1281 (iris)

[miri-in]

Hi,

while playing around with iris nodes I observed that
I could not physically change the clock frequency via
CFLAGS += -DMHZ=
(see also tos/platforms/iris/MicaTimer.h).

Interestingly, and if I am not mistaken, there is no access to register CLKPR
within the TinyOS code for iris nodes --- I expected something like

atomic {
// enable write
CLKPR = 1 << CLKPCE;
// set clock division factor
CLKPR =
}

for example in
tos/platforms/iris/MeasureClockC.nc

analogously to
systemClockInit() from
tos/chips/atm128rfa1/McuInitP.nc

Am I missing something or is this a serious issue?

Best regards,
Michael