README
1U-Boot for LogicPD i.MX6 Development Kit
2----------------------------------------
3
4This file contains information for the port of U-Boot to the Logic PD Development kit.
5
6Logic PD has an i.MX6 System On Module (SOM) and a correspondong development
7board. SOM has a built-in microSD socket, DDR and NAND flash. The development kit has
8an SMSC Ethernet PHY, serial debug port and a variety of peripherals.
9
10On the intial release, the SOM came with either an i.MX6D or i.MX6Q.
11
12For more details about Logic PD i.MX6 Development kit, visit:
13https://www.logicpd.com/
14
15Building U-Boot for Logic PD Development Kit
16--------------------------------------------
17To build U-Boot for the Dual and Quad variants:
18
19 make imx6q_logic_defconfig
20 make u-boot.imx CROSS_COMPILE=arm-linux-
21
22
23Flashing U-Boot into the SD card
24--------------------------------
25U-Boot is now building with SPL enabled which means there are two files to
26load into the SD card. Make sure the card is formatted with at least two
27partitions with the first partition being FAT32. First copy u-boot-dtb.img
28to the first partition then burn SPL to the SD card with dd.
29The SPL portion is programmed into a certain location for use by the internal
30bootROM and it cannot be changed. The following instructions assume the SD
31card is located as /dev/sdb.
32
33 cp u-boot-dtb.img /dev/media/logic/boot
34 sudo dd if=SPL of=/dev/sdb bs=1k seek=1 oflag=sync status=none && sync
35
36
37Flashing U-Boot into NAND
38-------------------------
39Once in Linux with MTD support for the NAND on /dev/mtd0, program U-Boot with the following:
40with:
41
42 kobs-ng init -v -x u-boot-dtb.imx
43
44
45Using Falcon Mode
46-----------------
47With Falcon Mode enabled, U-Boot can be bypassed by having SPL directly load
48the kernel. The device tree, Kernel and boot args must first be configured,
49and stored to a file on the micro SD card called 'args'
50The kernel uImage is built with LOAD_ADDR=0x12000000 and the device tree is
51assummed to be imx6q-logicpd.dtb.
52
53By default the mmcroot is set to the baseboard.
54
55 # Establish bootargs
56 run mmcargs
57
58 # Load Linux Kernel uImage
59 fatload mmc 1 $loadaddr uImage
60
61 # Load Device Tree
62 run loadfdt
63
64 # Setup the blob that will get passed to the kernel
65 spl export fdt ${loadaddr} - ${fdt_addr_r}
66
67 # Note the starting and ending address of the updated device tree.
68 # for this example:
69 # Loading Device Tree to 1ffdf000, end 1fff038b ... OK
70 # Notice that 0x1fff038b - 1ffdf000 = 0x1138b
71 # now Add 1, so the length is 0x1138c.
72
73 fatwrite mmc 1 0x1ffdf000 args 0x1138c
74
75 # Reset the board and it will bypass U-Boot and SPL will directly boot
76 # the uImage
77
78To interrupt the boot sequence and force U-Boot to load, hold the 'c' button
79while starting.
80
81Additional Support Documentation can be found at:
82https://support.logicpd.com/
83
84