1*f8b1e86dSFabio EstevamU-Boot for the Freescale i.MX6q SabreLite board 2*f8b1e86dSFabio Estevam 3*f8b1e86dSFabio EstevamThis file contains information for the port of U-Boot to the Freescale 4*f8b1e86dSFabio Estevami.MX6q SabreLite board. 5*f8b1e86dSFabio Estevam 6*f8b1e86dSFabio Estevam1. Boot source, boot from SD card 7*f8b1e86dSFabio Estevam--------------------------------- 8*f8b1e86dSFabio Estevam 9*f8b1e86dSFabio EstevamThe recent mainline U-Boot for the Freescale i.MX6q SabreLite board supports 10*f8b1e86dSFabio Estevamboot from SD card only. However, by default, the SabreLite 11*f8b1e86dSFabio Estevamboards boot from the SPI NOR flash. These boards need to be reflashed with 12*f8b1e86dSFabio Estevama small SD card loader to support boot from SD card. This small SD card loader 13*f8b1e86dSFabio Estevamwill be flashed into the SPI NOR. The board will still boot from SPI NOR, but 14*f8b1e86dSFabio Estevamthe loader will in turn request the BootROM to load the U-Boot from SD card. 15*f8b1e86dSFabio Estevam 16*f8b1e86dSFabio EstevamThe SD card loader is available from 17*f8b1e86dSFabio Estevam 18*f8b1e86dSFabio Estevamhttps://wiki.linaro.org/Boards/MX6QSabreLite 19*f8b1e86dSFabio Estevam 20*f8b1e86dSFabio Estevamunder a open-source 3-clause BSD license. 21*f8b1e86dSFabio Estevam 22*f8b1e86dSFabio EstevamTo update the SPI-NOR on the SabreLite board without the Freescale 23*f8b1e86dSFabio Estevammanufacturing tool use the following procedure: 24*f8b1e86dSFabio Estevam 25*f8b1e86dSFabio Estevam1. Write this SD card loader onto a large SD card using: 26*f8b1e86dSFabio Estevam 27*f8b1e86dSFabio Estevam sudo dd if=iMX6DQ_SPI_to_uSDHC3.bin of=/dev/sXx 28*f8b1e86dSFabio Estevam 29*f8b1e86dSFabio EstevamNote: Replace sXx with the device representing the SD card in your system. 30*f8b1e86dSFabio Estevam 31*f8b1e86dSFabio EstevamNote: This writes SD card loader at address 0 32*f8b1e86dSFabio Estevam 33*f8b1e86dSFabio Estevam2. Put this SD card into the slot for the large SD card (SD3 on the bottom of 34*f8b1e86dSFabio Estevamthe board). Make sure SW1 switch is at position "00", so that it can boot 35*f8b1e86dSFabio Estevamfrom the fuses. 36*f8b1e86dSFabio Estevam 37*f8b1e86dSFabio Estevam3. Power-up the SabreLite, press 'space' to enter command mode in the U-Boot 38*f8b1e86dSFabio Estevam(the default one the board is shipped with, starting from the SPI NOR) and 39*f8b1e86dSFabio Estevamenter the following commands: 40*f8b1e86dSFabio Estevam 41*f8b1e86dSFabio Estevam MX6Q SABRELITE U-Boot > mmc dev 0 42*f8b1e86dSFabio Estevam MX6Q SABRELITE U-Boot > mmc read 0x10800000 0 200 43*f8b1e86dSFabio Estevam MX6Q SABRELITE U-Boot > sf probe 44*f8b1e86dSFabio Estevam MX6Q SABRELITE U-Boot > sf erase 0 0x40000 45*f8b1e86dSFabio Estevam MX6Q SABRELITE U-Boot > sf write 0x10800000 0 0x40000 46*f8b1e86dSFabio Estevam 47*f8b1e86dSFabio Estevam4. done. 48*f8b1e86dSFabio Estevam 49*f8b1e86dSFabio EstevamIn case you somehow do not succeed with this procedure you will have to use 50*f8b1e86dSFabio Estevamthe Freescale manufacturing tool in order to reflash the SPI-NOR. 51*f8b1e86dSFabio Estevam 52*f8b1e86dSFabio EstevamNote: The board now boots from full size SD3 on the bottom of the board. NOT 53*f8b1e86dSFabio Estevam the micro SD4/BOOT slot on the top of the board. I.e. you have to use 54*f8b1e86dSFabio Estevam full size SD cards. 55*f8b1e86dSFabio Estevam 56*f8b1e86dSFabio EstevamThis information is taken from 57*f8b1e86dSFabio Estevam 58*f8b1e86dSFabio Estevamhttps://wiki.linaro.org/Boards/MX6QSabreLite 59*f8b1e86dSFabio Estevam 60*f8b1e86dSFabio Estevam2. Build 61*f8b1e86dSFabio Estevam-------- 62*f8b1e86dSFabio Estevam 63*f8b1e86dSFabio EstevamTo build U-Boot for the SabreLite board: 64*f8b1e86dSFabio Estevam 65*f8b1e86dSFabio Estevam make mx6qsabrelite_config 66*f8b1e86dSFabio Estevam make 67*f8b1e86dSFabio Estevam 68*f8b1e86dSFabio EstevamTo copy the resulting u-boot.imx to the SD card: 69*f8b1e86dSFabio Estevam 70*f8b1e86dSFabio Estevam sudo dd if=u-boot.imx of=/dev/sXx bs=512 seek=2&&sudo sync 71*f8b1e86dSFabio Estevam 72*f8b1e86dSFabio EstevamNote: Replace sXx with the device representing the SD card in your system. 73