topic Re: Boot after Reset Vector in PowerQUICC Processors

Boot after Reset Vector

talhazubair — Thu, 25 Oct 2018 12:20:50 GMT

Hey, I am using MPC8270, I have interfaced MPC8270 with 8-bit Flash. On power Up, Processor reads the Hard Reset Configuration Word and then does not execute code at reset vector. What might be the reason of not booting?

Current Settings:

(1) Assert PORESET for 3 seconds

(2) Tied RSTCONF to GND

(3) Boot Flash is connected to CS0 of processor

Re: Boot after Reset Vector

r8070z — Sun, 28 Oct 2018 08:23:04 GMT

Have a great day,

Please describe in details how processor does not execute code at reset vector. It does not negate HRESET or it does not fetch code from the boot flash… what happens?

Re: Boot after Reset Vector

talhazubair — Mon, 29 Oct 2018 05:37:23 GMT

The processor does not fetch instruction from the reset vector rather it is stucked at the reset vector.
Upon generating power on reset sequence it does fetch HRCW (Hard reset configuration word) from boot flash and configure its PLL but stucks at reset vector (0xfff00100).

Configurations right now:
(1) we assert PORESET signal after 1.3 seconds of applying power to the core and IOs.
(2) Assertion time of PORESET is 400ns

(3) HRESET and SRESET is asserted by the core every 100us for 10us, which definitely seems that software watch dog timers timeout is doing it.

Kindly guide us through this situation