mirror of
https://github.com/AsahiLinux/u-boot
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82 lines
2.7 KiB
Text
82 lines
2.7 KiB
Text
U-Boot for LogicPD i.MX6 Development Kit
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This file contains information for the port of U-Boot to the Logic PD Development kit.
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Logic PD has an i.MX6 System On Module (SOM) and a correspondong development
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board. SOM has a built-in microSD socket, DDR and NAND flash. The development kit has
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an SMSC Ethernet PHY, serial debug port and a variety of peripherals.
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On the intial release, the SOM came with either an i.MX6D or i.MX6Q.
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For more details about Logic PD i.MX6 Development kit, visit:
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https://www.logicpd.com/
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Building U-Boot for Logic PD Development Kit
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--------------------------------------------
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To build U-Boot for the Dual and Quad variants:
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make imx6q_logic_defconfig
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make u-boot.imx CROSS_COMPILE=arm-linux-
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Flashing U-Boot into the SD card
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--------------------------------
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U-Boot is now building with SPL enabled which means there are two files to
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load into the SD card. Make sure the card is formatted with at least two
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partitions with the first partition being FAT32. First copy u-boot-dtb.img
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to the first partition then burn SPL to the SD card with dd.
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The SPL portion is programmed into a certain location for use by the internal
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bootROM and it cannot be changed. The following instructions assume the SD
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card is located as /dev/sdb.
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cp u-boot-dtb.img /dev/media/logic/boot
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sudo dd if=SPL of=/dev/sdb bs=1k seek=1 oflag=sync status=none && sync
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Flashing U-Boot into NAND
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-------------------------
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Once in Linux with MTD support for the NAND on /dev/mtd0, program U-Boot with the following:
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with:
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kobs-ng init -v -x u-boot-dtb.imx
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Using Falcon Mode
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-----------------
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With Falcon Mode enabled, U-Boot can be bypassed by having SPL directly load
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the kernel. The device tree, Kernel and boot args must first be configured,
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and stored to a file on the micro SD card called 'args'
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The kernel uImage is built with LOAD_ADDR=0x12000000 and the device tree is
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assummed to be imx6q-logicpd.dtb.
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By default the mmcroot is set to the baseboard.
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# Establish bootargs
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run mmcargs
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# Load Linux Kernel uImage
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fatload mmc 1 $loadaddr uImage
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# Load Device Tree
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run loadfdt
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# Setup the blob that will get passed to the kernel
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spl export fdt ${loadaddr} - ${fdt_addr_r}
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# Note the starting and ending address of the updated device tree.
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# for this example:
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# Loading Device Tree to 1ffdf000, end 1fff038b ... OK
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# Notice that 0x1fff038b - 1ffdf000 = 0x1138b
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# now Add 1, so the length is 0x1138c.
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fatwrite mmc 1 0x1ffdf000 args 0x1138c
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# Reset the board and it will bypass U-Boot and SPL will directly boot
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# the uImage
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To interrupt the boot sequence and force U-Boot to load, hold the 'c' button
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while starting.
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Additional Support Documentation can be found at:
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https://support.logicpd.com/
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