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- .. SPDX-License-Identifier: GPL-2.0+
- mx6sabresd
- ==========
- How to use and build U-Boot on mx6sabresd
- -----------------------------------------
- The following methods can be used for booting mx6sabresd boards:
- 1. Booting from SD card
- 2. Booting from eMMC
- 3. Booting via Falcon mode (SPL launches the kernel directly)
- 1. Booting from SD card via SPL
- -------------------------------
- mx6sabresd_defconfig target supports mx6q/mx6dl/mx6qp sabresd variants.
- In order to build it:
- .. code-block:: bash
- $ make mx6sabresd_defconfig
- $ make
- This will generate the SPL and u-boot-dtb.img binaries.
- - Flash the SPL binary into the SD card:
- .. code-block:: bash
- $ sudo dd if=SPL of=/dev/sdX bs=1K seek=1 conv=notrunc && sync
- - Flash the u-boot-dtb.img binary into the SD card:
- .. code-block:: bash
- $ sudo dd if=u-boot-dtb.img of=/dev/sdX bs=1K seek=69 conv=notrunc && sync
- 2. Booting from eMMC
- --------------------
- .. code-block:: bash
- $ make mx6sabresd_defconfig
- $ make
- This will generate the SPL and u-boot-dtb.img binaries.
- - Boot first from SD card as shown in the previous section
- In U-boot change the eMMC partition config::
- => mmc partconf 2 1 0 0
- Mount the eMMC in the host PC::
- => ums 0 mmc 2
- - Flash SPL and u-boot-dtb.img binaries into the eMMC:
- .. code-block:: bash
- $ sudo dd if=SPL of=/dev/sdX bs=1K seek=1 conv=notrunc && sync
- $ sudo dd if=u-boot-dtb.img of=/dev/sdX bs=1K seek=69 conv=notrunc && sync
- Set SW6 to eMMC 8-bit boot: 11010110
- 3. Booting via Falcon mode
- --------------------------
- .. code-block:: bash
- $ make mx6sabresd_defconfig
- $ make
- This will generate the SPL image called SPL and the u-boot-dtb.img.
- - Flash the SPL image into the SD card
- .. code-block:: bash
- $ sudo dd if=SPL of=/dev/sdX bs=1K seek=1 oflag=sync status=none conv=notrunc && sync
- - Flash the u-boot-dtb.img image into the SD card
- .. code-block:: bash
- $ sudo dd if=u-boot-dtb.img of=/dev/sdX bs=1K seek=69 oflag=sync status=none conv=notrunc && sync
- Create a partition for root file system and extract it there
- .. code-block:: bash
- $ sudo tar xvf rootfs.tar.gz -C /media/root
- The SD card must have enough space for raw "args" and "kernel".
- To configure Falcon mode for the first time, on U-Boot do the following commands:
- - Setup the IP server::
- # setenv serverip <server_ip_address>
- - Download dtb file::
- # dhcp ${fdt_addr} imx6q-sabresd.dtb
- - Download kernel image::
- # dhcp ${loadaddr} uImage
- - Write kernel at 2MB offset::
- # mmc write ${loadaddr} 0x1000 0x4000
- - Setup kernel bootargs::
- # setenv bootargs "console=ttymxc0,115200 root=/dev/mmcblk1p1 rootfstype=ext4 rootwait quiet rw"
- - Prepare args::
- # spl export fdt ${loadaddr} - ${fdt_addr}
- - Write args 1MB data (0x800 sectors) to 1MB offset (0x800 sectors)::
- # mmc write 18000000 0x800 0x800
- - Press KEY_VOL_UP key, power up the board and then SPL binary will launch the kernel directly.
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