From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chris Packham <cp.packham@gmail.com>
Date: Wed, 02 Oct 2013 20:36:14 +1300
Subject: [U-Boot] [PPC] get_timer without CONFIG_INTERRUPTS
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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.