1*4882a593SmuzhiyunU-Boot for the Freescale i.MX6q SabreLite board 2*4882a593Smuzhiyun 3*4882a593SmuzhiyunThis file contains information for the port of U-Boot to the Freescale 4*4882a593Smuzhiyuni.MX6q SabreLite board. 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun1. Boot source, boot from SD card 7*4882a593Smuzhiyun--------------------------------- 8*4882a593Smuzhiyun 9*4882a593SmuzhiyunThe recent mainline U-Boot for the Freescale i.MX6q SabreLite board supports 10*4882a593Smuzhiyunboot from SD card only. However, by default, the SabreLite 11*4882a593Smuzhiyunboards boot from the SPI NOR flash. These boards need to be reflashed with 12*4882a593Smuzhiyuna small SD card loader to support boot from SD card. This small SD card loader 13*4882a593Smuzhiyunwill be flashed into the SPI NOR. The board will still boot from SPI NOR, but 14*4882a593Smuzhiyunthe loader will in turn request the BootROM to load the U-Boot from SD card. 15*4882a593Smuzhiyun 16*4882a593SmuzhiyunThe SD card loader is available from 17*4882a593Smuzhiyun 18*4882a593Smuzhiyunhttps://wiki.linaro.org/Boards/MX6QSabreLite 19*4882a593Smuzhiyun 20*4882a593Smuzhiyununder a open-source 3-clause BSD license. 21*4882a593Smuzhiyun 22*4882a593SmuzhiyunTo update the SPI-NOR on the SabreLite board without the Freescale 23*4882a593Smuzhiyunmanufacturing tool use the following procedure: 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun1. Write this SD card loader onto a large SD card using: 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun sudo dd if=iMX6DQ_SPI_to_uSDHC3.bin of=/dev/sXx 28*4882a593Smuzhiyun 29*4882a593SmuzhiyunNote: Replace sXx with the device representing the SD card in your system. 30*4882a593Smuzhiyun 31*4882a593SmuzhiyunNote: This writes SD card loader at address 0 32*4882a593Smuzhiyun 33*4882a593Smuzhiyun2. Put this SD card into the slot for the large SD card (SD3 on the bottom of 34*4882a593Smuzhiyunthe board). Make sure SW1 switch is at position "00", so that it can boot 35*4882a593Smuzhiyunfrom the fuses. 36*4882a593Smuzhiyun 37*4882a593Smuzhiyun3. Power-up the SabreLite, press 'space' to enter command mode in the U-Boot 38*4882a593Smuzhiyun(the default one the board is shipped with, starting from the SPI NOR) and 39*4882a593Smuzhiyunenter the following commands: 40*4882a593Smuzhiyun 41*4882a593Smuzhiyun MX6Q SABRELITE U-Boot > mmc dev 0 42*4882a593Smuzhiyun MX6Q SABRELITE U-Boot > mmc read 0x10800000 0 200 43*4882a593Smuzhiyun MX6Q SABRELITE U-Boot > sf probe 44*4882a593Smuzhiyun MX6Q SABRELITE U-Boot > sf erase 0 0x40000 45*4882a593Smuzhiyun MX6Q SABRELITE U-Boot > sf write 0x10800000 0 0x40000 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun4. done. 48*4882a593Smuzhiyun 49*4882a593SmuzhiyunIn case you somehow do not succeed with this procedure you will have to use 50*4882a593Smuzhiyunthe Freescale manufacturing tool in order to reflash the SPI-NOR. 51*4882a593Smuzhiyun 52*4882a593SmuzhiyunNote: The board now boots from full size SD3 on the bottom of the board. NOT 53*4882a593Smuzhiyun the micro SD4/BOOT slot on the top of the board. I.e. you have to use 54*4882a593Smuzhiyun full size SD cards. 55*4882a593Smuzhiyun 56*4882a593SmuzhiyunThis information is taken from 57*4882a593Smuzhiyun 58*4882a593Smuzhiyunhttps://wiki.linaro.org/Boards/MX6QSabreLite 59*4882a593Smuzhiyun 60*4882a593Smuzhiyun2. Build 61*4882a593Smuzhiyun-------- 62*4882a593Smuzhiyun 63*4882a593SmuzhiyunTo build U-Boot for the SabreLite board: 64*4882a593Smuzhiyun 65*4882a593Smuzhiyun make mx6qsabrelite_config 66*4882a593Smuzhiyun make 67*4882a593Smuzhiyun 68*4882a593SmuzhiyunTo copy the resulting u-boot.imx to the SD card: 69*4882a593Smuzhiyun 70*4882a593Smuzhiyun sudo dd if=u-boot.imx of=/dev/sXx bs=512 seek=2&&sudo sync 71*4882a593Smuzhiyun 72*4882a593SmuzhiyunNote: Replace sXx with the device representing the SD card in your system. 73