AnsweredAssumed Answered

Booting up issue in i.MX8M EVK for eMMC mode

Question asked by Venkatasai Thotakura on Jul 2, 2020
Latest reply on Jul 2, 2020 by Venkatasai Thotakura

Hi,

      We want to program the eMMC with our images (Linux, dtb & Root FS) and make the board boot up from SPI-NOR & eMMC combination, but during this process we had below observations and queries.

 

Environment:

  • Board Revision: SCH-29615 REV B4
  • SD card is flashed with our custom binary (with U-Boot 2018.03-imx_v2018.03_4.14.78_1.0.0_ga+g7ade5b407f (Jun 09 2020 - 07:17:26 +0000))

 

Observations:

  • Able to probe the flash in u-boot and got the below response

  • Able to clear the SPI-NOR flash (/dev/mtd0) from Linux userspace using the dd command and able to verify it using the hexdump

 

Queries:

  • When changed the boot mode switches to boot from eMMC with OFF OFF ON OFF (for SW 801 DIP switches 1 - 4 respectively) we are seeing logs of old version of u-boot (U-Boot 2017.03 (Apr 11 2018 - 10:04:36 +0800)) which probably had come with the board to boot the Android from eMMC. This behavior is same even after clearing the whole of SPI-NOR (/dev/mtd0) & eMMC memories. Not sure from where we are getting the logs of older u-boot as this mode should boot from SPI-NOR which is completely empty.

 

Got below logs for the older version of u-boot:

 

 

 

Please let me know for any additional information which might help to answer the query.

 

Thanks

Outcomes