On 9/18/14, 11:58 AM, "Robert Nelson" <robertcnel...@gmail.com> wrote:
>On Thu, Sep 18, 2014 at 1:48 PM, neo <prag.in...@gmail.com> wrote: >> Hi William >> >> If you are counting the PRU yes, but technically they are not >>processors but >> more of peripherals/programmable controllers. Connect me if i am wrong. > >There's other "processors" then the main Cortex-A8 core.. You got the >gpu and the Cortex-M3, both of which you can off load "tasks" too.. >(The M3, does pm..) Yeah, but this is all unrelated to the stability issue. When Charles talks about SMP safe, he is really talking about re-entrant safe code. With PREEMPT, the big kernel lock was broken up to improve the Interrupt latency. Now drivers have to ensure that variables/structures that are accessed from both the kernel code and interrupt context are protected or a race condition will occur. As Charles said, some of the third party drivers haven¹t been updated to make them safe. Most of these are fixed by following good programming practices that kernel gatekeepers enforce, but old drivers only get fixed when they are updated. Regards, John > >Regards, > >-- >Robert Nelson >http://www.rcn-ee.com/ > >-- >For more options, visit http://beagleboard.org/discuss >--- >You received this message because you are subscribed to the Google Groups >"BeagleBoard" group. >To unsubscribe from this group and stop receiving emails from it, send an >email to beagleboard+unsubscr...@googlegroups.com. >For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
