mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-28 07:31:15 +00:00
00102ae520
Since commit 9e3c0174da ("pico-imx7d: Add LCD support") we started to
notice some hangs in U-Boot.
There is not an issue on such commit per se, but due to the LCD support
the current drawn is increased and this may cause issues when powering
pico-imx7d-pi from USB.
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.
Add such recommendation to the README file.
Signed-off-by: Fabio Estevam <festevam@gmail.com>
68 lines
1.7 KiB
Text
68 lines
1.7 KiB
Text
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.
|