Thanks John for the explanation On Friday, September 19, 2014 1:05:47 AM UTC+5:30, john3909 wrote: > > > On 9/18/14, 11:58 AM, "Robert Nelson" <robert...@gmail.com <javascript:>> > wrote: > > >On Thu, Sep 18, 2014 at 1:48 PM, neo <prag....@gmail.com <javascript:>> > 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...@googlegroups.com <javascript:>. > >For more options, visit https://groups.google.com/d/optout. > > >
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