Boot from SD card with JTAGSEL high?

Discussion around products based on ARM Cortex-A5 core.

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nancyb
Posts: 7
Joined: Mon Oct 08, 2018 12:28 pm

Boot from SD card with JTAGSEL high?

Thu Jul 23, 2020 10:52 am

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?
blue_z
Location: USA
Posts: 2118
Joined: Thu Apr 19, 2007 10:15 pm

Re: Boot from SD card with JTAGSEL high?

Sat Jul 25, 2020 1:00 am

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
nancyb
Posts: 7
Joined: Mon Oct 08, 2018 12:28 pm

Re: Boot from SD card with JTAGSEL high?

Mon Jul 27, 2020 10:47 am

Thank you for your explanation. I will pass along this info.

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