Change to Serial download mode on uboot for MFG Tool

[tsung-chihwang]

Hi Yuri,

Does "bmode usb" mean that it will boot from usb device?

BR,

carter

[Yuri]

Hello,

  The U-boot command "bmode usb" means i.MX entering the serial (USB) downloader mode.

Regards,

Yuri.

[tsung-chihwang]

Hi Yuri,

However, it seems I met a strange issue.

I inserted a bootable SD card into the slot, then tried "bmode usb" command,

It will boot from SD card!

Could you tell me what the wrong is?

BR,

carter

[Yuri]

Hello,

  Looks like the boot goes to the SD/MMC manufacture mode

before the serial download mode.  Please refer to boot chapter of the i.MX device

about the the SD/MMC manufacture mode. 

Regards,

Yuri.

[tsung-chihwang]

Hi Yuri,

I was wondering if you could tell me how to do these:
1. How to check the SD/MMC manufacture mode is enabled or not? 

2. How can I read the value of this bit "Disable SDMMC Manufacture mode" on u-boot?

    md 0x470 1?

BR,

carter

[Yuri]

Hello,

   by default SD/MMC Manufacture Mode is enabled. 

For access to the fuses - base address i.MX 6ULL OCOTP is 0x021B_C000.

So, 0x021B_C470 may be used for read.

Have a great day,
Yuri

[tsung-chihwang]

Hi Yuri,

Thanks for your response.

I got this kind of test result on the same target:
(1) bmode usb=> it will enter serial download mode
(2) bmode sd1=> it can boot from the sd card.

Then I checked each part of the diagram.

It is set as below:
1. internal boot
2. boot from QSPI flash.
3. SDMMC MFG mode is not disabled.

However, why it can enter USB download mode, even already met the above three conditions.

It supposed show boot from sd card while I input bmode usb command on u-boot.

Could you help to point out where I missed?

If the result of SDMMC MFG mode boot is fail, why it can boot from sd card while I input bmode sd1 on u-boot.

BR,

carter

[tsung-chihwang]

Hi Yuri,

Thanks for your explanation.

I will check it.

Thanks so much.

BR,

carter

[aravinthkumarja]

Hi Carter,

"bmode usb" will go to USB download mode. We can flash the device through usb.

Regards,

Aravinth