> On Feb 27, 2017, at 1:42 PM, Juliusz Chroboczek <[email protected]> wrote: > >> The Cortex-M4 processors are similar to the Cortex-M4 micro-controllers >> available from Texas Instruments. They are mostly used for video >> compression/decompression, but you can use them to run then as bear bone > > Interesting. > > What about interrupt handling? I'd expect the Cortex-A15 to have > outrageous interrupt latencies, can the M4s be used for fast interrupt > handlers? Nothing to do with the Cortex-A15, the interrupt latency occurs because Linux disables interrupts during critical sections. If you were running bear bones code on the Cortex-A15, you would have fast interrupts. Same with Cortex-M4, interrupts are fast as long as you handle interrupts quickly and re-enable them. Using TI-RTOS, you will also have fast interrupt handling. > > Is RAM coherent between the A15 and the M4? What's the M4's bandwidth > to the RAM? You need to read Chapter 7 of the AM5728 Technical Reference Manual which shows that you can use IPU1 for general purpose application development, but IPU2 is dedicated to IVA which is for video encoders/decoders (Chapter 6). There is 32KB of L1 cache memory which is fast.
Regards, John > > -- Juliusz > > -- > 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 [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/87zih7nwdk.fsf%40trurl. > 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/4EEEDAA4-866D-4D28-AF90-C0848C430AF0%40gmail.com. For more options, visit https://groups.google.com/d/optout.
