1 U-Boot for the Freescale i.MX6q SabreLite board 2 3 This file contains information for the port of U-Boot to the Freescale 4 i.MX6q SabreLite board. 5 6 1. Boot source, boot from SD card 7 --------------------------------- 8 9 The recent mainline U-Boot for the Freescale i.MX6q SabreLite board supports 10 boot from SD card only. However, by default, the SabreLite 11 boards boot from the SPI NOR flash. These boards need to be reflashed with 12 a small SD card loader to support boot from SD card. This small SD card loader 13 will be flashed into the SPI NOR. The board will still boot from SPI NOR, but 14 the loader will in turn request the BootROM to load the U-Boot from SD card. 15 16 The SD card loader is available from 17 18 https://wiki.linaro.org/Boards/MX6QSabreLite 19 20 under a open-source 3-clause BSD license. 21 22 To update the SPI-NOR on the SabreLite board without the Freescale 23 manufacturing tool use the following procedure: 24 25 1. Write this SD card loader onto a large SD card using: 26 27 sudo dd if=iMX6DQ_SPI_to_uSDHC3.bin of=/dev/sXx 28 29 Note: Replace sXx with the device representing the SD card in your system. 30 31 Note: This writes SD card loader at address 0 32 33 2. Put this SD card into the slot for the large SD card (SD3 on the bottom of 34 the board). Make sure SW1 switch is at position "00", so that it can boot 35 from the fuses. 36 37 3. Power-up the SabreLite, press 'space' to enter command mode in the U-Boot 38 (the default one the board is shipped with, starting from the SPI NOR) and 39 enter the following commands: 40 41 MX6Q SABRELITE U-Boot > mmc dev 0 42 MX6Q SABRELITE U-Boot > mmc read 0x10800000 0 200 43 MX6Q SABRELITE U-Boot > sf probe 44 MX6Q SABRELITE U-Boot > sf erase 0 0x40000 45 MX6Q SABRELITE U-Boot > sf write 0x10800000 0 0x40000 46 47 4. done. 48 49 In case you somehow do not succeed with this procedure you will have to use 50 the Freescale manufacturing tool in order to reflash the SPI-NOR. 51 52 Note: The board now boots from full size SD3 on the bottom of the board. NOT 53 the micro SD4/BOOT slot on the top of the board. I.e. you have to use 54 full size SD cards. 55 56 This information is taken from 57 58 https://wiki.linaro.org/Boards/MX6QSabreLite 59 60 2. Build 61 -------- 62 63 To build U-Boot for the SabreLite board: 64 65 make mx6qsabrelite_config 66 make 67 68 To copy the resulting u-boot.imx to the SD card: 69 70 sudo dd if=u-boot.imx of=/dev/sXx bs=512 seek=2&&sudo sync 71 72 Note: Replace sXx with the device representing the SD card in your system. 73
