[Trac #322] hard crash with DCON test loop.

[Zarro Boogs per Child]

#322: hard crash with DCON test loop.
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 Reporter:  dwmw2    |       Owner:  dwmw2  
     Type:  defect   |      Status:  new    
 Priority:  blocker  |   Milestone:  BTest-1
Component:  kernel   |    Keywords:         
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 A simple loop reinitialising the DCON causes a hard crash.

 It isn't just resetting the PLL that does it -- if you only leave it in a
 loop of writing 0x69 and 0x169 to register 1 and doing 'dmesg -c' it's
 been observed to die too. It isn't an IRQ storm -- I've hacked the driver
 to printk on _every_ interrupt (even scanline), and I'm watching DCONIRQ
 on the scope anyway.

 Will try to get FS2 working in the morning but if anyone else with FS2-fu
 can reproduce in the meantime that would be massively useful.

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Ticket URL: <http://dev.laptop.org/ticket/322>
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