DRA726: QSPI_1 boot issue

Peter Li79

Part Number: DRA726

Hi, expert:

My customer is having some problem with QSPI_1 boot.

For normal boot, which can successfully boot to APP image, the waveform looks like below:

(the YELLOW line shows when their IPL starts to run -- toggle a GPIO first, the MOSI-label is actually the MISO)

When QSPI_1 boot fails, the waveform looks like below:

Please kindly share some comments:

1. does the successfully-boot waveform look normal?

Why are there two duration of clocks? The first is with higher amplitude (low DC offset), the second is with lower amplitude (higher offset).

2. does the failure-boot waveform look normal？

It looks like there is a retry mechanism.

any questions or comments are welcome!

Thanks.

0 Yordan Kamenov over 6 years ago

Hi Peter,

I have pinged an expert to look at this, but please note that response may be delayed due to Christmas and New Year holidays.

Regards,

Yordan

0 Peter Li79 over 6 years ago in reply to Yordan Kamenov

Hi, Yordan:

I have onsite checked with customer, and we find some improper scope setup.

Now, with proper setup, the waveform seems normal.

I am helping customer with their "QSPI_1 boot failure" issue.

Please share some QSPI_1 boot waveforms (clock & D0) captured if available.

Many thanks.

0 Peter Li79 over 6 years ago in reply to Peter Li79

Hi, experts:

Just to share two scope capture:

the first one is "no valid data" from SPI flash:

0 Peter Li79 over 6 years ago in reply to Peter Li79

below are valid reading:

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