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DMA external port of shrac 21489  cash reboot

Question asked by eagles on Sep 25, 2013
Latest reply on Oct 1, 2013 by Harshit.Gaharwar


     I run a standard DMA on the external port of sharc 21489 (external memory devices -> internal memory).

I encountered two problems in the process of DMA implement .

First ,I set up the dma transfers at the Interrupt handler(IRQ1) ,after IRQ1 interrupt execution ends, the system will be reboot .


Then,I set up the dma transfers at the main task(whihout operating system) .

Strangly, the length of ICEP/ECEP register can not be equal or greater than 144 bytes, Otherwise the system will be reboot .


When system reboot after an crash occurs, I can not find any useful messagle to locate the crash.