On Friday, September 14, 2012 7:04:14 PM, Greg Topmiller wrote:

SoC: i.MX51 Board: mx51evk and our own board that is based on the mx51evk. Linux: FSL version.

Perfect, so we are in exactly the same test conditions, except for mx51evk.

Can you try mx51evk with U-Boot 2012.07 and mainline Linux 3.5.3, using the default configs and unpatched code?

My debug plan for the next steps is: - Find out if FSL's U-Boot 2009.12 touches TZIC in some way. - Using a JTAG probe in the calibrate_delay() loop, dump TZIC registers to check GPT interrupt security, priority, pending status, FIQ vs. IRQ vs. CPSR and wakeup stuff. - If not pending, then the issue probably comes from the GPT; otherwise, from interrupt propagation. - Use the TZIC registers to trigger the GPT interrupt to see if the handler gets called.

Best regards, Benoît