U-Boot for the Freescale i.MX6q SabreLite board
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This file contains information for the port of U-Boot to the Freescale
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i.MX6q SabreLite board.
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1. Boot source, boot from SD card
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---------------------------------
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The recent mainline U-Boot for the Freescale i.MX6q SabreLite board supports
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boot from SD card only. However, by default, the SabreLite
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boards boot from the SPI NOR flash. These boards need to be reflashed with
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a small SD card loader to support boot from SD card. This small SD card loader
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will be flashed into the SPI NOR. The board will still boot from SPI NOR, but
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the loader will in turn request the BootROM to load the U-Boot from SD card.
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The SD card loader is available from
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https://wiki.linaro.org/Boards/MX6QSabreLite
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under a open-source 3-clause BSD license.
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To update the SPI-NOR on the SabreLite board without the Freescale
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manufacturing tool use the following procedure:
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1. Write this SD card loader onto a large SD card using:
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sudo dd if=iMX6DQ_SPI_to_uSDHC3.bin of=/dev/sXx
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Note: Replace sXx with the device representing the SD card in your system.
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Note: This writes SD card loader at address 0
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2. Put this SD card into the slot for the large SD card (SD3 on the bottom of
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the board). Make sure SW1 switch is at position "00", so that it can boot
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from the fuses.
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3. Power-up the SabreLite, press 'space' to enter command mode in the U-Boot
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(the default one the board is shipped with, starting from the SPI NOR) and
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enter the following commands:
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MX6Q SABRELITE U-Boot > mmc dev 0
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MX6Q SABRELITE U-Boot > mmc read 0x10800000 0 200
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MX6Q SABRELITE U-Boot > sf probe
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MX6Q SABRELITE U-Boot > sf erase 0 0x40000
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MX6Q SABRELITE U-Boot > sf write 0x10800000 0 0x40000
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4. done.
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In case you somehow do not succeed with this procedure you will have to use
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the Freescale manufacturing tool in order to reflash the SPI-NOR.
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Note: The board now boots from full size SD3 on the bottom of the board. NOT
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the micro SD4/BOOT slot on the top of the board. I.e. you have to use
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full size SD cards.
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This information is taken from
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https://wiki.linaro.org/Boards/MX6QSabreLite
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2. Build
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--------
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To build U-Boot for the SabreLite board:
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make mx6qsabrelite_config
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make
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To copy the resulting u-boot.imx to the SD card:
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sudo dd if=u-boot.imx of=/dev/sXx bs=512 seek=2&&sudo sync
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Note: Replace sXx with the device representing the SD card in your system.
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