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      1 How to use and build U-Boot on mx6sabresd
      2 -----------------------------------------
      3 
      4 The following methods can be used for booting mx6sabresd boards:
      5 
      6 1. Booting from SD card
      7 
      8 2. Booting from eMMC
      9 
     10 3. Booting via Falcon mode (SPL launches the kernel directly)
     11 
     12 
     13 1. Booting from SD card via SPL
     14 -------------------------------
     15 
     16 mx6sabresd_defconfig target supports mx6q/mx6dl/mx6qp sabresd variants.
     17 
     18 In order to build it:
     19 
     20 $ make mx6sabresd_defconfig
     21 
     22 $ make
     23 
     24 This will generate the SPL and u-boot.img binaries.
     25 
     26 - Flash the SPL binary into the SD card:
     27 
     28 $ sudo dd if=SPL of=/dev/sdX bs=1K seek=1 && sync
     29 
     30 - Flash the u-boot.img binary into the SD card:
     31 
     32 $ sudo dd if=u-boot.img of=/dev/sdX bs=1K seek=69 && sync
     33 
     34 
     35 2. Booting from eMMC
     36 --------------------
     37 
     38 $ make mx6sabresd_defconfig
     39 
     40 $ make
     41 
     42 This will generate the SPL and u-boot.img binaries.
     43 
     44 - Boot first from SD card as shown in the previous section
     45 
     46 In U-boot change the eMMC partition config:
     47 
     48 => mmc partconf 2 1 0 0
     49 
     50 Mount the eMMC in the host PC:
     51 
     52 => ums 0 mmc 2
     53 
     54 - Flash SPL and u-boot.img binaries into the eMMC:
     55 
     56 $ sudo dd if=SPL of=/dev/sdX bs=1K seek=1 && sync
     57 $ sudo dd if=u-boot.img of=/dev/sdX bs=1K seek=69 && sync
     58 
     59 Set SW6 to eMMC 8-bit boot: 11010110
     60 
     61 
     62 3. Booting via Falcon mode
     63 --------------------------
     64 
     65 $ make mx6sabresd_defconfig
     66 $ make
     67 
     68 This will generate the SPL image called SPL and the u-boot.img.
     69 
     70 - Flash the SPL image into the SD card:
     71 
     72 $ sudo dd if=SPL of=/dev/sdX bs=1K seek=1 oflag=sync status=none && sync
     73 
     74 - Flash the u-boot.img image into the SD card:
     75 
     76 $ sudo dd if=u-boot.img of=/dev/sdX bs=1K seek=69 oflag=sync status=none && sync
     77 
     78 Create a partition for root file system and extract it there:
     79 
     80 $ sudo tar xvf rootfs.tar.gz -C /media/root
     81 
     82 The SD card must have enough space for raw "args" and "kernel".
     83 To configure Falcon mode for the first time, on U-Boot do the following commands:
     84 
     85 - Setup the IP server:
     86 
     87 # setenv serverip <server_ip_address>
     88 
     89 - Download dtb file:
     90 
     91 # dhcp ${fdt_addr} imx6q-sabresd.dtb
     92 
     93 - Download kernel image:
     94 
     95 # dhcp ${loadaddr} uImage
     96 
     97 - Write kernel at 2MB offset:
     98 
     99 # mmc write ${loadaddr} 0x1000 0x4000
    100 
    101 - Setup kernel bootargs:
    102 
    103 # setenv bootargs "console=ttymxc0,115200 root=/dev/mmcblk1p1 rootfstype=ext4 rootwait quiet rw"
    104 
    105 - Prepare args:
    106 
    107 # spl export fdt ${loadaddr} - ${fdt_addr}
    108 
    109 - Write args 1MB data (0x800 sectors) to 1MB offset (0x800 sectors)
    110 
    111 # mmc write 18000000 0x800 0x800
    112 
    113 - Press KEY_VOL_UP key, power up the board and then SPL binary will
    114 launch the kernel directly.
    115