L2C boot crash on BCM Capri

[linux@arm.linux.org.uk (Russell King - ARM Linux)]

On Thu, Apr 24, 2014 at 06:44:56PM +0100, Russell King - ARM Linux wrote:
> On Thu, Apr 24, 2014 at 10:26:11AM -0700, Kevin Hilman wrote:
> > [    0.100000] L2C-310 enabling early BRESP for Cortex-A9
> > [    0.110000] L2C-310 full line of zeros enabled for Cortex-A9
> > [    0.110000] L2C-310 dynamic clock gating enabled, standby mode enabled
> > [    0.120000] Unhandled fault: imprecise external abort (0xc06) at 0x44a42d67
> 
> The unfortunate thing about imprecise external aborts is that they don't
> tell us what went wrong - we have to guess.
> 
> My guess would be that something isn't wired up correctly between the
> Cortex-A9 and L2 controller in Broadcom SoCs.  You could try disabling
> the clock gating/standby mode - I doubt it's the FLZ feature as that
> also requires the Cortex-A9 configuration to be changed as well, which
> wouldn't have happened at the point this fault occurred.
> 
> Also, it's possible that BRESP could cause it.  Try disabling each in
> turn and see what effect they have...

BTW, this is something _you_ will have to do, because _I_ don't have
access to the failing hardware.

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