STM32F7 EVAL Boot mode

[imtiaz]

Posted on December 06, 2016 at 02:50

Hi,

I am trying to put the STM32F769i_EVAL into system BOOT mode. I can do this successfully with an F429 Eval but not with the F7 Eval. I can see that when I reset it the normal program does not run , indicating that Bot mode has been entered , but it does not respond to the 0x7f (connect ) command.

I've tried with both my own known working software loader and the ST flash loader. I am using UART 1 which is otherwise working. Ive tries various baudrates down to 9600.

I am pulling up the Boot pin JP1 directly to VDD and resetting the board.

Many Thanks

Imtiaz

#stm32f7-boot-mode

[imtiaz]

Posted on December 21, 2016 at 03:33

Hi John,

Thanks for that . I am awaiting reply from ST who have got to the same conclusion as you have. I am hoping the issue is only to do with the dev boards rather than the F7 chip itself. Possibly the pin is not getting to the right voltage level or something.

Thanks

Imtiaz

[Nesrine M_O · Accepted solution]

Posted on December 23, 2016 at 16:10

Hi

abdullah.abdullah

‌,

• I recommend you to remove the R124 from your evaluation board then try the test.
• keep us informed about the result

-Nesrine-

Ifmy suggestanswers your question, please mark it as correct.

[imtiaz]

Posted on January 08, 2017 at 21:15

Hi ,

Yes removing R124 from the Eval board fixes the issue , both the DFU and Uart can now access the bootloader. 

The Flash Loader Demonstrator utility however does not recognose the device - so I could'nt test reprogramming.

Is there a similar resistor to remove on the Discovery board?

Thanks

Imtaz

[imtiaz]

Posted on January 09, 2017 at 04:08

Hi,

An explanation of  why disconnecting R124 fixes the issue on the EVAL would be beneficial. 

[Tesla DeLorean]

Posted on January 09, 2017 at 03:50

The PA5 ULPI_CK pin on the STM32F769I-DISCO can't be disconnected.

[Tesla DeLorean]

Posted on January 09, 2017 at 05:18

Does anyone of the UPLI pins show up on the list of signals the System Loader is monitoring? PA5 doesn't appear inherently useful in this regard, SPI1/SPI6 clock perhaps?

[imtiaz]

Posted on January 09, 2017 at 20:57

PA5 is the SPI1 bootloader SCK - AN2606 page 175.

SPI1_SCK pin Input PA5 pin: Slave clock line, used in Push-pull pull-down mode