imx6 can not load bootloader

[linhsun]

Dear all

    My board is i.MX6 SABRE MCIMX6Q-SDB, I use mfgtool download image, after (power on) can not load u-boot(uart not see message), I have change SW6 (jump) to sdcard(0100 0010) or emmc(1101 0110)  boot mode, but always into download mode, please help me, thank

[Yuri]

Hello

  Please try using the SD card demo image (it has .sdcard file extension).

i.MX 6 Series Software and Development Tool|NXP 

You  may apply Win32DiskImager to copy the image to SD card

under Windows host. 

https://sourceforge.net/projects/win32diskimager/

Have a great day,
Yuri

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[linhsun]

Dear Yuri Muhin 

      I have try your suggest, always into download mode, should is not sdcard question , because (SW6) jump setting to any mode, result can not into u-boot(can see HID devices on windows ), thank very much.

[Yuri]

Have You tried both SD slots : SD2 and SD3 ?

~Yuri.

[linhsun]

Dear Yuri

   Yes, I have(plug in SD, setting SW3 to 1000 0010 and 0100 0010), but always into download mode, thank your help.

[Yuri]

[linhsun]

Dear Yuri

    Thank you very much. found problem!! I unintentional setting fuse (boot mode is change), can I read fuse status via command or tool?  

[Yuri]

Hello,

  Good starting point is to read IMX6 RM (fusemap, system boot, and

on-chip OTP Controller) and AN4581 (Secure Boot on i.MX50, i.MX53, and i.MX 6
Series using HABv4)

https://cache.freescale.com/files/32bit/doc/app_note/AN4581.pdf

then you can use command ‘fuse’ of u-boot.

 Also, after Linux kernel boot /sys/fsl_opt may be used to review the fuses.

Regards,

Yuri.

[linhsun]

Thank you help, this helpful.