> > This reverts commit 406663ed61c8ad2b792824af1c1bc0e4faa711c6. With > > BPREDICT enabled, my Lager board can't boot anymore and gets stuck > > early in the boot process (mostly without any printout, sometimes with a > > little printout) > > And it just stops without printing anything special?
Yes. The only notable difference I recognized in the output was the set bit for branch prediction in the cr register output. That's why I assumed this commit to be guilty... > > > Signed-off-by: Wolfram Sang <[email protected]> > > I suspect you're bitten by the issue from "RCU lockup? (was: Re: [PATCH v2 > tip/core/rcu 10/14] rcu: Don't redundantly disable irqs in > rcu_irq_{enter,exit}())" > (http://www.spinics.net/lists/kernel/msg2167464.html). ... but it seems you are right on the spot here. Thanks! > Does it help if you add a function > > void filler(void) > { > asm("nop"); > asm("nop"); > } Adding 21 nops made the board boot again. (Wow, adding NOPs everywhere really feels like hacking the Commodore 64 when trying to get the timing stable :D) This is gonna be a nasty one :(
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