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Boot from SD card with JTAGSEL high?

Posted: Thu Jul 23, 2020 10:52 am
by nancyb
I'm debugging a new SAMA5D27 board spin where JTAGSEL has been pulled high. Will this prevent the CPU from booting from the SD card?

Re: Boot from SD card with JTAGSEL high?

Posted: Sat Jul 25, 2020 1:00 am
by blue_z
JTAGSEL pulled high combined with a reset of the SAMA5D27 enables JTAG Boundary Scan (i.e. the chip is in a test mode that disconnects pins from their normal function).
So yes, that can inhibit booting.

Regards

Re: Boot from SD card with JTAGSEL high?

Posted: Mon Jul 27, 2020 10:47 am
by nancyb
Thank you for your explanation. I will pass along this info.