3.1 Bootloader

• Enter the directory of bootloader, uncompress the source code package as shown below：

$ cd <WORKDIR>/Bootloader
$ tar -zxvf myir-u-boot.tar.gz
$ cd myir-u-boot

• Compile U-Boot：

The configuration of U-boot for MYD-C437X-PRU is located at myir-u-boot/configs/, the corresponding configuration file name and output files are shown below:

Compile U-boot for MYD-C437X-PRU development board：

$ make distclean
$ make myd_c437x_defconfig
$ make

After compiling U-boot, MLO and u-boot.img will be generated for mmc boot mode, They can be used for booting from TF Card(mmc0) and EMMC(mmc1). Users can interrupt the running of U-boot by pressing SPACE key in the debug terminal on host PC to enter the console of U-boot. Please input help command in the U-boot console to get the usage of U-boot as shown below:

># help            -- Display help for U-boot
># echo            -- View a U-boot environment variable