Help: one of our AM1810 developing board cannot work

Guotao Zhang

Other Parts Discussed in Thread: AM1810

Hi, professionals! We need your help again.

The case is as follows:

We made 3 AM1810 developing boards in one batch by SMT, and two of them works well, but for one board no "Boot me" was printed out.

We have already checked up 1) power supply for AM1810 is normal(1.2V, 33.V,3.3V); 2)24MHz crystal oscillator is normal from oscilloscope; 3) Reset circuit is normal.

But we still cannot find the problem. Could you please help with suggestions from other aspects that we haven't noticed yet? Really appreciate a lot to you.

over 11 years ago

0 Titusrathinaraj Stalin over 11 years ago

TI__Guru** 116100 points

Hi,

Please ensure that your DIP boot switch (hw) is functional.

Refer the below ti e2e post as like yours.

http://e2e.ti.com/support/dsp/omap_applications_processors/f/42/t/37617.aspx

0 Guotao Zhang over 11 years ago in reply to Titusrathinaraj Stalin

Intellectual 705 points

Hi Titusrathinaraj！

Thanks for your response. I am sorry I haven't updated the question for such long time. Actually we met other problems on other board at the same time.

For this problem, "Bootme" cannot still be printed out after we checked Reset circuit, Crystal Oscillator and Booter Settings. Today we are going to check the Serial interface circuit.

We have another question:

Where is the code carried out for bootme printing? Is it on DDR2 or on buffer memory?

Thank you!

0 Titusrathinaraj Stalin over 11 years ago in reply to Guotao Zhang

TI__Guru** 116100 points

Hi,

Where is the code carried out for bootme printing? Is it on DDR2 or on buffer memory?

This "BOOTE" print was in RBL code which is executing in IRAM (internal RAM)

For this problem, "Bootme" cannot still be printed out after we checked Reset circuit, Crystal Oscillator and Booter Settings. Today we are going to check the Serial interface circuit.

Even, Any no junks print out on serial ?

0 Guotao Zhang over 11 years ago in reply to Titusrathinaraj Stalin

Intellectual 705 points

Hi！

Even, Any no junks print out on serial ? Yes，but only 00 was printed out after powering on or pushing reset button.

0 Guotao Zhang over 11 years ago in reply to Titusrathinaraj Stalin

Intellectual 705 points

Hi!

Finally we fixed the problem of "Bootme" printing out.

We checked the reset circuit and found some problem. We replaced the MOSFET with an NPN transistor and adjusted resistors. Now, the board can print out "Bootme" normally.

Thanks for your suggestions.

0 Titusrathinaraj Stalin over 11 years ago in reply to Guotao Zhang

TI__Guru** 116100 points

Hi Guotao,

Thanks for your update.

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Help: one of our AM1810 developing board cannot work