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Avnet Ultrazed-EV: Red led when boot fails

deville

Hi there,

 

I was wondering if someone could explain the mechanism of the red LED3:  PS_ERROR_OUT

I know the label says something like : there is an error on the PS side :-) but I like to comprehend what is causing the led to light up.

 

Because it is strange it waits 8 seconds before it get activated so I have the feeling this questions answer might pop up in the future again with our future designs.

 

Thanks for your answer,

Deville

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  • 0 in reply to jafoste4

    Thanks for your guide. I think this would come in handy later on.

     

    Concerning the LED ERR led.

    I'm no expert at this but I can't read out PMU_LOCAL. It is not present in the "rrd" register overview. I also noticed this in your example.

     

    The online register page you've provided states for BOOT_STAGE:

     

    During boot, this register holds a code specify which stage in boot the PMU is currently in. After boot, this register can be used by the Firmware as a general storage register. Its contents are not modified or used by the PMU ROM after handoff to the Firmware.

     

    So, I wonder. It this the reason I can't read out these boot status registers?

     

    Thanks Joshua

    Deville

  • 0 in reply to deville

    Hi Deville,

    Reading through the register page, it shows that register set as private. How interesting, reading through the  TRM these are only accessible via the PMU.

     

    Mind collecting a dump of the PMU_Global register set and pasting it here? We may find a clue there.

     

    -Josh

  • 0 in reply to jafoste4

    Ok I missed the private thing, Good call. 

     

    Here, at our firm,  we concluded that since the LED has multiple error causes there must be some underlying mechanism. Even when the SD is pulled out there is no FSBL nor PMU firmware present, yet the LED lights up. We think the CSU handles this.

     

    Looking at my log: CSU_BR_ERROR says: 0x3B. From the manual UG1085 on page 242:  0x3B Reading failed from the selected boot device.  ( yes, I unplugged my SD card to generate an error )

     

    I saw your device is having error 0x23:  Error occurred during QSPI 24 boot mode initialization

     

    Here is my register log:

    image

     

    Deville