How to use U-Boot on Freescale MX6DQSCM boards
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- Build U-Boot for MX6DQSCM QWKS rev3 board*:

$ make mx6dqscm_1gb_fix_qwks_rev3_defconfig
$ make

This will generate the u-boot image u-boot.imx.

- Flash the u-boot image into the micro SD card:

sudo dd if=u-boot.imx of=/dev/sdX bs=1k seek=1; sync

*Other defconfigs availabe are:
    mx6dqscm_1gb_fix_qwks_rev3_defconfig
    mx6dqscm_1gb_fix_qwks_rev3_spinor_defconfig
    mx6dqscm_1gb_interleaving_qwks_rev3_android_defconfig


- Jumper settings for fix mode images to boot from the top SD:

Fix mode                        SW1: ON  ON  OFF OFF ON  OFF OFF ON
Interleave mode                 SW1: ON  OFF ON  OFF ON  OFF OFF ON
Single channel(512MB/epop)      SW1: ON  OFF OFF OFF ON  OFF OFF ON

- Jumper settings for fix mode images to boot from internal SPI-NOR:

Fix mode                        SW1: ON  ON  OFF X   X   ON  ON  OFF
Interleave mode                 SW1: ON  OFF ON  X   X   ON  ON  OFF
Single channel(512MB/epop)      SW1: ON  OFF OFF X   X   ON  ON  OFF

- Jumper settings to boot from internal eMMC (just for ePOP):

Single channel(epop)            SW1: ON  OFF OFF ON  ON  OFF ON  ON


Additional configurations
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For custom configurations like 2GB or 512MB, the following option can be added on the defconfig
according with the customization needed. (Check also the Kconfig file at the mx6dqscm directory)

 - memory size option: 512MB, 2GB (if not set any, 1GB is the default value)

     CONFIG_SCM_LPDDR2_512MB
     CONFIG_SCM_LPDDR2_2GB

 - memeory mode: fix or interleave (if not set any, fix/single mode is the default mode)

     CONFIG_INTERLEAVING_MODE

 - boot mode: SPI-NOR boot or SD (if not set any, MMC/SD is the default boot mode)

     CONFIG_SPI_BOOT

 - board: evb, qwks (if not set any, qwks-rev2 is the default board)

     CONFIG_SCMHVB
     CONFIG_QWKS_REV3
     CONFIG_SCMEVB
     CONFIG_SCMHVB