AM3352: Boot issue at high temperature

MyoungBong Kim64

Part Number: AM3352
Other Parts Discussed in Thread: SYSCONFIG

Hi. We have a problem on booting.

We make a custom board using am3352. we tested booting test at high temperature. The board was left in the chamber for one hour at 75°C and supply power.

At that time, some boards did not booting. we didn't receive any message from console. The boards operated normally at 25°C.

we use sysboot config '01011b' (usb0-> nand-> spi0-> mmc0). there was no device on the usb0. The booting data is in nand. usb0 is only used for testing and debugging.

I wonder why the board did not booting at high temperature.

Best Regards.

over 7 years ago

0 Biser Gatchev-XID over 7 years ago

TI__Guru**** 393215 points

Hi,

You should check the processor temperature when ambient is 75°C, and whether it's within the part temperature range. Same is valid for all other components. Here is a guide: processors.wiki.ti.com/.../AM335x_Thermal_Considerations

0 MyoungBong Kim64 over 7 years ago in reply to Biser Gatchev-XID

Prodigy 40 points

Dear Biser.

No power while in chamber. Apply after one hour.
and also we used automotive or industrial components. component's temperature range is no problem.
We tested a little more...
The board that did not boot will work well if change the sysconfig '01100b' (usb0-> nand-> XIP-> NANDI2C) or '01101b' (usb0-> nand-> XIP-> SPI0) at 75°C
and also the board works well when HW reset is applied when it is not booting.

Best Regards.

0 Biser Gatchev-XID over 7 years ago in reply to MyoungBong Kim64

TI__Guru**** 393215 points

In this case you should check around the SYSBOOT pins. They should all be at valid levels at reset release time.

0 MyoungBong Kim64 over 7 years ago in reply to Biser Gatchev-XID

Prodigy 40 points

When I checked the SYSBOOT pins, some were not at normal voltage levels at reset release time.
After fixing it, boot normally at 75°C.

Thank you.

Best regards.

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AM3352: Boot issue at high temperature