On 30/09/13 21:22, Chris Packham wrote:

Hi,

Has anyone looked at a way of implementing get_timer for PowerPC without using interrupts.

We appear to be having a problem with common/usb_hub.c where occasionally (1 in ~150 reboots) we seem to get stuck in the do/while loop in usb_hub_configure. It looks like this should timeout but because we don't define CONFIG_INTERRUPTS get_timer() will only ever return 0.

I'm being a little paranoid (perhaps too paranoid) about turning on CONFIG_INTERRUPTS. Looking at the code I can't see too much that would cause problems but I want to avoid a rogue LBC or PCI-e interrupt locking up the CPU.

Thanks, Chris

To answer my own question you do not need CONFIG_INTERRUPTS for get_timer to work. You do however have to have called interrupts_init. Our mistake was to add a call to usb_start in our boards misc_init_r.