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Diego Dorta9cc3ad62016-10-11 11:09:28 -03001How to use and build U-Boot on mx6sabresd:
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4Currently there are three methods for booting mx6sabresd boards:
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61. Booting via Normal U-Boot (u-boot.imx)
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82. Booting via SPL (SPL and u-boot.img)
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103. Booting via Falcon mode (SPL launches the kernel directly)
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131. Booting via Normal U-Boot
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15
16$ make mx6qsabresd_defconfig (If you want to build for mx6qsabresd)
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18or
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20$ make mx6dlsabresd_defconfig (If you want to build for mx6dlsabresd)
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22$ make
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24This will generate the image called u-boot.imx.
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26- Flash the u-boot.imx binary into the SD card:
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28$ sudo dd if=u-boot.imx of=/dev/sdb bs=1K seek=1 && sync
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312. Booting via SPL
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34Other method for building U-Boot on mx6qsabresd and mx6qpsabresd is
35through SPL. In order to do so:
36
37$ make mx6sabresd_spl_defconfig
38$ make
39
40This will generate the SPL image called SPL and the u-boot.img.
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42- Flash the SPL image into the SD card:
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44$ sudo dd if=SPL of=/dev/sdb bs=1K seek=1 && sync
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46- Flash the u-boot.img image into the SD card:
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48$ sudo dd if=u-boot.img of=/dev/sdbbs=1K seek=69 && sync
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513. Booting via Falcon mode
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53
54$ make mx6sabresd_spl_defconfig
55$ make
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57This will generate the SPL image called SPL and the u-boot.img.
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59- Flash the SPL image into the SD card:
60
61$ sudo dd if=SPL of=/dev/sdb bs=1K seek=1 oflag=sync status=none && sync
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63- Flash the u-boot.img image into the SD card:
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65$ sudo dd if=u-boot.img of=/dev/sdbbs=1K seek=69 oflag=sync status=none && sync
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67Create a partition for root file system and extract it there:
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69$ sudo tar xvf rootfs.tar.gz -C /media/root
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71The SD card must have enough space for raw "args" and "kernel".
72To configure Falcon mode for the first time, on U-Boot do the following commands:
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74- Setup the IP server:
75
76# setenv serverip <server_ip_address>
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78- Download dtb file:
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80# dhcp ${fdt_addr} imx6q-sabresd.dtb
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82- Download kernel image:
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84# dhcp ${loadaddr} uImage
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86- Write kernel at 2MB offset:
87
88# mmc write ${loadaddr} 0x1000 0x4000
89
90- Setup kernel bootargs:
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92# setenv bootargs "console=ttymxc0,115200 root=/dev/mmcblk1p1 rootfstype=ext4 rootwait quiet rw"
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94- Prepare args:
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96# spl export fdt ${loadaddr} - ${fdt_addr}
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98- Write args 1MB data (0x800 sectors) to 1MB offset (0x800 sectors)
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100# mmc write 18000000 0x800 0x800
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102- Press KEY_VOL_UP key, power up the board and then SPL binary will
103launch the kernel directly.