1.. SPDX-License-Identifier: GPL-2.0+
2
3mx6sabreauto
4============
5
6How to use and build U-Boot on mx6sabreauto
7-------------------------------------------
8
9mx6sabreauto_defconfig target supports mx6q/mx6dl/mx6qp sabreauto variants.
10
11In order to build it:
12
13.. code-block:: bash
14
15   $ make mx6sabreauto_defconfig
16   $ make
17
18This will generate the SPL and u-boot-dtb.img binaries.
19
20- Flash the SPL binary into the SD card:
21
22.. code-block:: bash
23
24   $ sudo dd if=SPL of=/dev/sdX bs=1K seek=1 conv=notrunc && sync
25
26- Flash the u-boot-dtb.img binary into the SD card:
27
28.. code-block:: bash
29
30   $ sudo dd if=u-boot-dtb.img of=/dev/sdX bs=1K seek=69 conv=notrunc && sync
31
32Booting via Falcon mode
33-----------------------
34
35Write in mx6sabreauto_defconfig the following define below:
36
37CONFIG_SPL_OS_BOOT=y
38
39In order to build it:
40
41.. code-block:: bash
42
43   $ make mx6sabreauto_defconfig
44   $ make
45
46This will generate the SPL image called SPL and the u-boot-dtb.img.
47
48- Flash the SPL image into the SD card:
49
50.. code-block:: bash
51
52   $ sudo dd if=SPL of=/dev/sdb bs=1K seek=1 conv=notrunc && sync
53
54- Flash the u-boot-dtb.img image into the SD card:
55
56.. code-block:: bash
57
58   $ sudo dd if=u-boot-dtb.img of=/dev/sdb bs=1K seek=69 conv=notrunc && sync
59
60Create a FAT16 boot partition to store uImage and the dtb file, then copy the files there:
61
62.. code-block:: bash
63
64   $ sudo cp uImage /media/boot
65   $ sudo cp imx6dl-sabreauto.dtb /media/boot
66
67Create a partition for root file system and extract it there:
68
69.. code-block:: bash
70
71   $ sudo tar xvf rootfs.tar.gz -C /media/root
72
73The SD card must have enough space for raw "args" and "kernel".
74To configure Falcon mode for the first time, on U-Boot do the following commands:
75
76- Load dtb file from boot partition::
77
78   # load mmc 0:1 ${fdt_addr} imx6dl-sabreauto.dtb
79
80- Load kernel image from boot partition::
81
82   # load mmc 0:1 ${loadaddr} uImage
83
84- Write kernel at 2MB offset::
85
86   # mmc write ${loadaddr} 0x1000 0x4000
87
88- Setup kernel bootargs::
89
90   # setenv bootargs "console=ttymxc3,115200 root=/dev/mmcblk0p1 rootfstype=ext4 rootwait quiet rw"
91
92- Prepare args::
93
94   # spl export fdt ${loadaddr} - ${fdt_addr}
95
96- Write args 1MB data (0x800 sectors) to 1MB offset (0x800 sectors)::
97
98   # mmc write 18000000 0x800 0x800
99
100- Restart the board and then SPL binary will launch the kernel directly.
101