Proxmark3 community

notserpe

Member

From: Montreal

Registered: 2009-09-15

Posts: 14

Website

Read the value for MAINF?

If you have JTAG set up for your board, would you mind posting the value you get for MAINF when you read CKGR_MCFR?
This can be done simply with the target halted from the openocd jtag telnet command line with:

mdw 0xfffffc24

My ZikZak PM3 reports a MAINF of 16,594,000. I'm trying to understand if the crystal is really way off or if this is a error related to how the AT91SAM7S counts the freq over 16 slow clock cycles. Unfortunately, I don't have scope handy. Ideally you would read your MAINF
from the register and measure the on-board 16Mhz crystal with a scope.

Thanks in advance

Last edited by notserpe (2010-10-04 12:22:21)

holiman

Contributor

Registered: 2013-05-03

Posts: 566

Re: Read the value for MAINF?

@rabi, perhaps you posted to the wrong topic? "Gone in 360 seconds" was done by Roel Verdult, his forum name is "rule"