what to do when i.mx6q USB OTG device is not detected in "serial download" mode?

[patrickdietrich]

I have a new i.MX6Q design (based on Nitrogen6X), that I am doing the inital bring-up on.

Power rails check out, POR is good, clocks are good.

When I set the boot mode pins to enable the serial download mode, I can't see my USB device under windows (as HID) or linux (as Freescale Recovery Mode).

Any ideas on why the USB OTG port would not be showing up?

thanks!

[Yuri]

Looks like the system does not start, so please check Your design

HW Design Checking List for i.MX6DQSDL

Also, please refer to Chapter 8 (Avoiding Board Bring-up Problems)

of "Hardware Development Guide for i.MX 6 ..."

http://cache.freescale.com/files/32bit/doc/app_note/AN4397.pdf 

Have a great day,
Yuri

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

[patrickdietrich]

Thanks Yuri.

I've been following the Hardware Design Guide already, I will try the excel checklist you sent and see how I make out.

Have you ever seen the USB OTG not come up for any particular reasons?

Thanks,

Patrick

[Yuri]

  If boot ROM starts, USB OTG should be working (assuming hardware is OK).
Just for asurance, please try to connect i.MX6 OTG to PC via self-powered USB2 hub.
  Another option - i.MX6 can enter SD / MMC Manufacture mode before serial boot one. 

Re: i.MX6DL boot strange result: boot mode connect Serial downloader mode (USB OTG), SD connect and ...

Re: i.MX6 solo: problem forcing it into USB serial downloader mode

Note, i.MX6Q does not support SD / MMC  Manufacture mode.

~Yuri.

[patrickdietrich]

Yuri! I'm baaaack....

OK so here is what's happened so far, things are going very well!!!

- I'm able to know say that my hardware is OK and the i.MX6Q seems to be functioning properly

- I still am NOT able to boot from SPI_NOR, SD card or USB OTG via recovery mode, HOWEVER this is how I can jump start things:

--->  I power on my device, load up DS-5 and my DSTREAM

---> start up DDR3 initialization script

---> copy a u-boot.bin image into DDR3 memory, then run u-boot

--->  then I cant test all the features of my board no problem.

BUT what I still can't figure out is what I can't get my board to boot up into any modes from cold power up (IE not JTAG jump starting it)????

It's as if the i.MX6Q is ignoring my BOOT_MODE and BOOT_CONFIGX pins???

Any thoughts on this??  See my attached schematic sheets for this section of my design.

[patrickdietrich]

OK I've even gone a step further and have been able to verify that the  BMOD[1:0] field of the SRC Boot Mode Register (SRC_SBMR2) are being properly toggled via my DIP Switches.  So the boot mode IS being set!  But still not boot to USB OTG or others, I still have to kickoff things by loading my uboot into memory and then moving the program counter to start things up.

any help from anyone would be appreciated.

thanks!

[Yuri]

Your schematic regarding the boot pins looks OK.

You wrote about SRC_SBMR2 ; what are values for other bit fields of this register ?

~Yuri

[patrickdietrich]

OK here are the readings from some of the notable SRC registers.  Any ideas from this?

addr	register	BOOT_MODE=00	BOOT_MODE=01	BOOT_MODE=10	BOOT_MODE=11
0x20D8008	SRC_SRSR	0x00000001	0x00000001	0x00000001	0x00000001
0x20D8004	SRC_SBMR1	0x00000000	0x18003030	0x18003030	0x18003030
0x20D801C	SRC_SBMR2	0x20000001	0x21000001	0x22000001	0x23000001

[Yuri]

   Is it possible to prolong POR ?

~Yuri.