board/technexion/pico-imx7d/README

   1 How to update U-Boot on pico-imx7d board
   2 ----------------------------------------
   3
   4 Required software on the host PC:
   5
   6 - imx_usb_loader: https://github.com/boundarydevices/imx_usb_loader
   7
   8 Build U-Boot for pico:
   9
  10 $ make mrproper
  11 $ make pico-imx7d_defconfig
  12 $ make
  13
  14 This generates the U-Boot binary called u-boot.imx.
  15
  16 Put pico board in USB download mode (refer to the PICO-iMX7D Quick Start Guide
  17 page 3)
  18
  19 Connect a USB to serial adapter between the host PC and pico.
  20
  21 Connect a USB cable between the OTG pico port and the host PC.
  22
  23 Open a terminal program such as minicom.
  24
  25 Copy u-boot.imx to the imx_usb_loader folder.
  26
  27 Load u-boot.imx via USB:
  28
  29 $ sudo ./imx_usb u-boot.imx
  30
  31 Then U-Boot starts and its messages appear in the console program.
  32
  33 Use the default environment variables:
  34
  35 => env default -f -a
  36 => saveenv
  37
  38 Run the UMS command:
  39 => ums 0 mmc 0
  40
  41 Transfer u-boot.imx to be flashed into the eMMC:
  42
  43 $ sudo dd if=u-boot.imx of=/dev/sdX bs=1K seek=1; sync
  44
  45 Remove power from the pico board.
  46
  47 Put pico board into normal boot mode.
  48
  49 Power up the board and the new updated U-Boot should boot from eMMC.
  50
  51 Building U-Boot to boot with NXP 4.1 kernel:
  52
  53 The NXP 4.1 kernel boots only in secure boot mode on mx7.
  54
  55 Follow the next steps to enable secure boot:
  56
  57 $ make mrproper
  58 $ make pico-imx7d_defconfig
  59 $ make menuconfig
  60         -> ARM architecture
  61         -> [*] Enable support for booting in non-secure mode
  62         -> [*]   Boot in secure mode by default
  63         -> Exit
  64 $ make
  65
  66 Flash u-boot.imx using the imx_usb_loader tool.