How Android non-device tree uboot modifies default environment variables

This article mainly introduces the relevant knowledge of "Android non-device tree uboot how to modify default environment variables". The editor shows you the operation process through an actual case. The operation method is simple, fast and practical. I hope this article "Android non-device tree uboot how to modify default environment variables" can help you solve the problem.

After the iTOP-iMX6 development board is written, the default is the system parameters and screen parameters of the 9.7inch screen of the android system. The figure below is as follows

70.1 important environmental variables

The more important environment variables, or frequently used environment variables, are already in the red box in the figure above.

Mainly: bootsystem, lcdtype and bootargs. These parameters can be set in the uboot source code. The specific document is: "iTOP-iMX6_android4.4.2/bootable/bootloader/uboot-imx/lib_arm/board.c" file.

70.2 default boot system settings

The default startup system parameter is: bootsystem. Open the board.c file. Search for the keyword "bootsystem" and find the following code:

70.3 default screen settings

The default screen parameter is: lcdtype. Open the board.c file. Search for the keywords "lcdtype". Find the following code.

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