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https://github.com/AsahiLinux/u-boot
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If PMIC is not probed successfully, it is still OK to boot with default configuration although power is not optimized. Default voltage of SW1A/SW1B is 1.1V/1.0V for PC32PF3000A1EP on pico according to table 42 of spec of PF3000 ver 9.0. Default mode of SW1A/SW1B is APS as expected(table 47). Signed-off-by: Jun Nie <jun.nie@linaro.org> |
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| .. | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| pico-imx7d.c | ||
| README | ||
| README.pico-imx7d_BL33 | ||
| spl.c | ||
How to update U-Boot on pico-imx7d board ---------------------------------------- Required software on the host PC: - imx_usb_loader: https://github.com/boundarydevices/imx_usb_loader Build U-Boot for pico: $ make mrproper $ make pico-imx7d_defconfig $ make This generates the SPL and u-boot.img binaries. 1. Loading U-Boot via USB Serial Download Protocol Note: This method is convenient for development purposes. If the eMMC has already a U-Boot flashed with DFU support then the user can go to step 2 below in order to update U-Boot. Put pico board in USB download mode (refer to the PICO-iMX7D Quick Start Guide page 3) Connect a USB to serial adapter between the host PC and pico. Connect a USB cable between the OTG pico port and the host PC. Note: Some computers may be a bit strict with USB current draw and will shut down their ports if the draw is too high. The solution for that is to use an externally powered USB hub between the board and the host computer. Open a terminal program such as minicom. Copy SPL and u-boot.img to the imx_usb_loader folder. Load the SPL binary via USB: $ sudo ./imx_usb SPL Load the u-boot.img binary via USB: $ sudo ./imx_usb u-boot.img Then U-Boot starts and its messages appear in the console program. Use the default environment variables: => env default -f -a => saveenv 2. Flashing U-Boot into the eMMC Run the DFU agent so we can flash the new images using dfu-util tool: => dfu 0 mmc 0 Flash SPL and u-boot.img into the eMMC running the following commands on a PC: $ sudo dfu-util -D SPL -a spl $ sudo dfu-util -D u-boot.img -a u-boot Remove power from the pico board. Put pico board into normal boot mode. Power up the board and the new updated U-Boot should boot from eMMC.