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Booting from SD with the i.MX6

Question asked by Nathan Jozwiak on Jan 20, 2016
Latest reply on Feb 3, 2016 by Nathan Jozwiak

Hi all,

 

I am trying to boot u-boot from an SD card on an i.MX6 custom board and am having some difficulties.

 

I have used a JTAG emulator to load u-boot into DDR manually and run it. So I've ironed out DDR timing issues and basic board operation. I have validated u-boot runs and successfully gets to the command prompt. From there I have validated the MMC device is accessible and I can load the kernel binary into memory from the SD card. So I know the interface is working properly, but I cannot seem to boot from the SD card.

 

I have also validated with an oscilloscope that, on power up, clocks are going to the SD card.

 

From my reading I believe that the u-boot.imx image should be placed at offset 1024 on the SD card

Linux on the i.MX6 sabre sd platform in a few commands

u-boot on the i.MX6 sabre sd platform in a few commands)

The specified item was not found.

 

I have tried various ways to program the binary to the SD card, but have been unsuccessful in booting the board from SD:

    $ sudo dd if=u-boot.imx of=/dev/sdb bs=1k seek=1

    $ sudo dd if=u-boot.imx of=/dev/sdb bs=512 seek=2

 

So I have a few questions:

 

1. What address does the i.MX6 boot ROM read from on power-up when it's looking for the DCD table in the u-boot.imx image?

2. What data is the boot ROM looking for?

3. How do I troubleshoot this further?

 

In case of relevance, my i.MX6 chip is: MCIMX6Q6AVT10AD SBFV1535 5N55D KOREA D1FVSBF

 

Thanks.

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