1*4882a593SmuzhiyunHow to use and build U-Boot on mx6sabreauto 2*4882a593Smuzhiyun------------------------------------------- 3*4882a593Smuzhiyun 4*4882a593Smuzhiyunmx6sabreauto_defconfig target supports mx6q/mx6dl/mx6qp sabreauto variants. 5*4882a593Smuzhiyun 6*4882a593SmuzhiyunIn order to build it: 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun$ make mx6sabreauto_defconfig 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun$ make 11*4882a593Smuzhiyun 12*4882a593SmuzhiyunThis will generate the SPL and u-boot.img binaries. 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun- Flash the SPL binary into the SD card: 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun$ sudo dd if=SPL of=/dev/sdX bs=1K seek=1 && sync 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun- Flash the u-boot.img binary into the SD card: 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun$ sudo dd if=u-boot.img of=/dev/sdX bs=1K seek=69 && sync 21*4882a593Smuzhiyun 22*4882a593SmuzhiyunBooting via Falcon mode 23*4882a593Smuzhiyun----------------------- 24*4882a593Smuzhiyun 25*4882a593SmuzhiyunWrite in mx6sabreauto_defconfig the following define below: 26*4882a593Smuzhiyun 27*4882a593SmuzhiyunCONFIG_SPL_OS_BOOT=y 28*4882a593Smuzhiyun 29*4882a593SmuzhiyunIn order to build it: 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun$ make mx6sabreauto_defconfig 32*4882a593Smuzhiyun 33*4882a593Smuzhiyun$ make 34*4882a593Smuzhiyun 35*4882a593SmuzhiyunThis will generate the SPL image called SPL and the u-boot.img. 36*4882a593Smuzhiyun 37*4882a593Smuzhiyun- Flash the SPL image into the SD card: 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun$ sudo dd if=SPL of=/dev/sdb bs=1K seek=1 && sync 40*4882a593Smuzhiyun 41*4882a593Smuzhiyun- Flash the u-boot.img image into the SD card: 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun$ sudo dd if=u-boot.img of=/dev/sdb bs=1K seek=69 && sync 44*4882a593Smuzhiyun 45*4882a593SmuzhiyunCreate a FAT16 boot partition to store uImage and the dtb file, then copy the files there: 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun$ sudo cp uImage /media/boot 48*4882a593Smuzhiyun 49*4882a593Smuzhiyun$ sudo cp imx6dl-sabreauto.dtb /media/boot 50*4882a593Smuzhiyun 51*4882a593SmuzhiyunCreate a partition for root file system and extract it there: 52*4882a593Smuzhiyun 53*4882a593Smuzhiyun$ sudo tar xvf rootfs.tar.gz -C /media/root 54*4882a593Smuzhiyun 55*4882a593SmuzhiyunThe SD card must have enough space for raw "args" and "kernel". 56*4882a593SmuzhiyunTo configure Falcon mode for the first time, on U-Boot do the following commands: 57*4882a593Smuzhiyun 58*4882a593Smuzhiyun- Load dtb file from boot partition: 59*4882a593Smuzhiyun 60*4882a593Smuzhiyun# load mmc 0:1 ${fdt_addr} imx6dl-sabreauto.dtb 61*4882a593Smuzhiyun 62*4882a593Smuzhiyun- Load kernel image from boot partition: 63*4882a593Smuzhiyun 64*4882a593Smuzhiyun# load mmc 0:1 ${loadaddr} uImage 65*4882a593Smuzhiyun 66*4882a593Smuzhiyun- Write kernel at 2MB offset: 67*4882a593Smuzhiyun 68*4882a593Smuzhiyun# mmc write ${loadaddr} 0x1000 0x4000 69*4882a593Smuzhiyun 70*4882a593Smuzhiyun- Setup kernel bootargs: 71*4882a593Smuzhiyun 72*4882a593Smuzhiyun# setenv bootargs "console=ttymxc3,115200 root=/dev/mmcblk0p1 rootfstype=ext4 rootwait quiet rw" 73*4882a593Smuzhiyun 74*4882a593Smuzhiyun- Prepare args: 75*4882a593Smuzhiyun 76*4882a593Smuzhiyun# spl export fdt ${loadaddr} - ${fdt_addr} 77*4882a593Smuzhiyun 78*4882a593Smuzhiyun- Write args 1MB data (0x800 sectors) to 1MB offset (0x800 sectors) 79*4882a593Smuzhiyun 80*4882a593Smuzhiyun# mmc write 18000000 0x800 0x800 81*4882a593Smuzhiyun 82*4882a593Smuzhiyun- Restart the board and then SPL binary will launch the kernel directly. 83