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Question asked by HyunSuk Lee on Oct 9, 2019
Latest reply on Dec 11, 2019 by HyunSuk Lee

Hello, All


I'm beginner about imx6 processor.  Checking functions with the SABREAUTO RDK board.

I was getting started with i.MX_Yocto_Project_User's_Guide.pdf inside of  imx-yocto-L4.14.98_2.0.0_ga.tar.gz.


It worked everything - built a sdcard image with yocto, write it to sdcard with mfgtool and boot with sdcard.

The SABREAUTO RDK board has not the MMC chip, only it has the sdcard slot.


Custom board is not ready, it has a eMMC chip.

Check to select the MMC mode of boot options with the sdcard, before the board comes out.


I think it could boot a MMC mode with sdcard, but it didn't shows any messages on the serial port.


SDcard Boot: BOOT_CFG1 = 0100_1000b, BOOT_CFG2 = 0011_0010b

MMC Boot: BOOT_CFG1 = 0110_1000b, BOOT_CFG2 = 0011_0010b

The options are almost the same, changed a MMC mode.

  • Fast Boot is Regular, MMC Speed is Normal.
  • Bus Width is 4bit, Port select is uSDHC3, Boot ROM default, Boot Ack Disable.


Please let me advice about it.