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https://github.com/brain-hackers/u-boot-brain
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ce2f9def82
Explain how to flash the eMMC and how to boot from it. Signed-off-by: Breno Lima <breno.lima@nxp.com> Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
143 lines
3.2 KiB
Plaintext
143 lines
3.2 KiB
Plaintext
How to use and build U-Boot on mx6sabresd:
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Currently there are four methods for booting mx6sabresd boards:
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1. Booting from SD card via normal U-Boot (u-boot.imx)
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2. Booting from eMMC via normal U-Boot
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3. Booting via SPL (SPL and u-boot.img)
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4. Booting via Falcon mode (SPL launches the kernel directly)
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1. Booting from SD card via normal U-Boot
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-----------------------------------------
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$ make mx6qsabresd_defconfig (If you want to build for mx6qsabresd)
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or
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$ make mx6dlsabresd_defconfig (If you want to build for mx6dlsabresd)
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$ make
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This will generate the image called u-boot.imx.
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- Flash the u-boot.imx binary into the SD card:
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$ sudo dd if=u-boot.imx of=/dev/sdb bs=1K seek=1 && sync
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2. Booting from eMMC via normal U-Boot
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--------------------------------------
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$ make mx6qsabresd_defconfig (If you want to build for mx6qsabresd)
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or
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$ make mx6dlsabresd_defconfig (If you want to build for mx6dlsabresd)
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$ make
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This will generate the image called u-boot.imx.
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- Flash the u-boot.imx binary into the eMMC:
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Set SW6 to download mode: 00001100
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Plug a usb cable to USB-OTG and load the u-boot image using the imx_usb_loader
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tool (https://github.com/boundarydevices/imx_usb_loader):
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$ sudo ./imx_usb u-boot.imx
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In U-boot change the eMMC partition config:
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=> mmc partconf 2 1 0 0
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Mount the eMMC in the host PC:
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=> ums 0 mmc 2
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Flash the u-boot.imx binary
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$ sudo dd if=u-boot.imx of=/dev/sdX bs=1K seek=1 && sync
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Set SW6 to eMMC 8-bit boot: 11010110
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3. Booting via SPL
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------------------
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Other method for building U-Boot on mx6qsabresd and mx6qpsabresd is
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through SPL. In order to do so:
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$ make mx6sabresd_spl_defconfig
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$ make
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This will generate the SPL image called SPL and the u-boot.img.
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- Flash the SPL image into the SD card:
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$ sudo dd if=SPL of=/dev/sdb bs=1K seek=1 && sync
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- Flash the u-boot.img image into the SD card:
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$ sudo dd if=u-boot.img of=/dev/sdbbs=1K seek=69 && sync
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4. Booting via Falcon mode
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--------------------------
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$ make mx6sabresd_spl_defconfig
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$ make
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This will generate the SPL image called SPL and the u-boot.img.
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- Flash the SPL image into the SD card:
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$ sudo dd if=SPL of=/dev/sdb bs=1K seek=1 oflag=sync status=none && sync
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- Flash the u-boot.img image into the SD card:
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$ sudo dd if=u-boot.img of=/dev/sdbbs=1K seek=69 oflag=sync status=none && sync
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Create a partition for root file system and extract it there:
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$ sudo tar xvf rootfs.tar.gz -C /media/root
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The SD card must have enough space for raw "args" and "kernel".
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To configure Falcon mode for the first time, on U-Boot do the following commands:
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- Setup the IP server:
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# setenv serverip <server_ip_address>
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- Download dtb file:
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# dhcp ${fdt_addr} imx6q-sabresd.dtb
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- Download kernel image:
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# dhcp ${loadaddr} uImage
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- Write kernel at 2MB offset:
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# mmc write ${loadaddr} 0x1000 0x4000
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- Setup kernel bootargs:
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# setenv bootargs "console=ttymxc0,115200 root=/dev/mmcblk1p1 rootfstype=ext4 rootwait quiet rw"
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- Prepare args:
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# spl export fdt ${loadaddr} - ${fdt_addr}
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- Write args 1MB data (0x800 sectors) to 1MB offset (0x800 sectors)
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# mmc write 18000000 0x800 0x800
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- Press KEY_VOL_UP key, power up the board and then SPL binary will
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launch the kernel directly.
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