IMX6UL boot up sequence

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IMX6UL boot up sequence

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michaelcarrier
Contributor III

We have a custom design based on the imx6ulevk. The hardware folks have even included the GPIO switches to tell the micro that it can boot from and SD card. We are having a bit of difficulty getting the board running. In reading the 6UL reference manual section 8 (system boot) the on board ROM will execute and read the GPIOs to determine the micro's boot device. If the switches are set correctly on our custom board then the micro should attempt to read an SD card. But, we are not seeing any activity on the SD clock line. In comparing the EVK to our design I can see SD clock activity diring the boot process. Our board, nothing. I have also noticed that our 24MHZ crystal does not appear to be running which is different than the EVK.

The question I have is this: when the 6UL is booting it is using an internal RC clock to run and does not need the 24 MHZ crystal, correct?

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jamesbone
NXP TechSupport
NXP TechSupport

Hello Michael,

That it is not correct you need the 24Mhz also.

Please take a look to the Hardware Development Guide.http://cache.nxp.com/files/32bit/doc/user_guide/IMX6ULHDG.pdf?fpsp=1&WT_TYPE=Users%20Guides&WT_VENDO...

http://cache.nxp.com/files/32bit/doc/user_guide/IMX6ULHDG.pdf?fpsp=1&WT_TYPE=Users%20Guides&WT_VENDO...


Have a great day,
Jaime

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michaelcarrier
Contributor III

Everything is working as expected. We had some PCB issues with the boot time GPIOs that was cause the micro problems.

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michaelcarrier
Contributor III

We are currently walking through this document. I just wanted to confirm that the 24MHZ clock is used during boot. thanks for the quick response.

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329 Views
jamesbone
NXP TechSupport
NXP TechSupport

Hello Michael,

That it is not correct you need the 24Mhz also.

Please take a look to the Hardware Development Guide.http://cache.nxp.com/files/32bit/doc/user_guide/IMX6ULHDG.pdf?fpsp=1&WT_TYPE=Users%20Guides&WT_VENDO...

http://cache.nxp.com/files/32bit/doc/user_guide/IMX6ULHDG.pdf?fpsp=1&WT_TYPE=Users%20Guides&WT_VENDO...


Have a great day,
Jaime

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Note: If this post answers your question, please click the Correct Answer button. Thank you!
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