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