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1 How to Update U-Boot on Pico-imx6ul board
2 -----------------------------------------
6 - imx_usb_loader: https://github.com/boundarydevices/imx_usb_loader
8 - dfu-util: http://dfu-util.sourceforge.net/releases/
10 Build U-Boot for Pico:
13 $ make pico-imx6ul_defconfig
16 This generates the SPL and u-boot-dtb.img binaries.
18 1. Loading U-Boot via USB Serial Download Protocol
21 If the eMMC has already a U-Boot flashed with DFU support then
22 the user can go to step 2 below in order to update U-Boot.
25 http://www.wandboard.org/images/hobbit/hobbitboard-imx6ul-reva1.pdf
34 Copy SPL and u-boot-dtb.img to the imx_usb_loader folder.
40 Load the u-boot-dtb.img binary via USB:
42 $ sudo ./imx_usb u-boot-dtb.img
44 Then U-Boot starts and its messages appear in the console program.
48 => env default -f -a
51 2. Flashing U-Boot into the eMMC
53 Run the DFU agent so we can flash the new images using dfu-util tool:
57 Flash SPL and u-boot-dtb.img into the eMMC running the following commands on a PC:
59 $ sudo dfu-util -D SPL -a spl
61 $ sudo dfu-util -D u-boot-dtb.img -a u-boot
67 Power up the board and the new updated U-Boot should boot from eMMC.
78 $ make -j4 uImage LOADADDR=0x80800000
81 $ cp arch/arm/boot/dts/imx6ul-pico-hobbit.dtb /tftpboot
83 In the U-Boot prompt:
90 => tftp ${fdt_addr} imx6ul-pico-hobbit.dtb
102 => spl export fdt ${loadaddr} - ${fdt_addr}
104    Image Name:   Linux-4.19.0-rc2-next-20180905-0
126 --- a/configs/pico-hobbit-imx6ul_defconfig
127 +++ b/configs/pico-hobbit-imx6ul_defconfig
128 @@ -53,3 +53,4 @@ CONFIG_USB_GADGET_VENDOR_NUM=0x0525
134 Then rebuild U-Boot:
136 $ make pico-hobbit-imx6ul_defconfig
137 $ make -j4
145 $ sudo dd if=u-boot-dtb.img  of=/dev/sdX bs=1k seek=69; sync
149 U-Boot SPL 2018.09-rc2-00156-g8c46f15-dirty (Sep 05 2018 - 16:24:05 -0300)
152 …-rc2-next-20180905-00001-gb805e2d (fabio@fabio-Latitude-E5450) (gcc version 5.4.0 20160609 (Ubuntu…