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So that during initial boot time kernel boots with single CPU to reduce 300ms boot time.
U BOOT BOOTARGS HOW TO
You can check how to use them with print. There are 4 cpus running on linux kernel. In fact, many of the above environment variables have been set up. MiB/s) U-Boot setenv bootargs consolettyO0,115200 U-Boot bootz 0x80200000 - 0x80f00000 Kernel image 0x80200000 0x000000 - 0x464998 Flattened. The environment is protected by a CRC32 checksum. There are four lines of uBoot commands: setenv bootargs consolettySTM0,115200 earlyprintk consoleblank0 ignoreloglevel fatload mmc 0 0xc0000000 zImage fatload mmc 0 0xc0500000 rootfs. Rootfs: Based on default config for stm32f469. It is used to store environment variables which can be used to configure the system. Linux kernel: Change DRAM address to 0x0c000000 and size to 0x01000000.
U BOOT BOOTARGS DOWNLOAD
It actually calls run netboot, and netboot does the following things: download the kernel, download the device tree, set kernel startup parameters, and start the kernel. What is the U-Boot environment As the documentation puts it: the U-Boot environment is a block of memory that is kept on persistent storage and copied to RAM when U-Boot starts. bootcmd is a command that uboot will execute automatically if it does not enter the command line after uboot starts. Thats why Thorogood® has relentlessly focused on craftsmanship, innovation, and comfort in all our work boots. Comfort and performance are key, and you wont get very far for very long if your boots arent made to stand up under tough conditions. Set network kernel startup parameters: setenv netargs setenv bootargs console=ttyO0,115200n8 $ Real work boots are special they arent made like other types of shoes. Set the device tree file name fdtfile (in fact, uboot was originally set in this step, but I didn't write it here when I made uboot, so I have to set it myself): setenv fdtfile lkf_am335x.dtb Setenv rootpath /home/ubuntu/disk-2/nfs_rootfs Next, set the server ip and the nfs directory on the server: setenv serverip 192.168.88.18 Returning "host xx.xx.xx.xx is alive" indicates that my server has been accessed normally. Set the development board address after entering the command line: setenv ipaddr 192.168.88.16Īfter setting the ip, you can test whether the server can be ping ed normally: ping 192.168.88.18 Kernel zImage and device tree file LKF have been placed in tftp directory_ am335x. In this example, my server address is 192.168.88.18, and the nfs and file system directory is: / home/ubuntu/disk-2/nfs_rootfs, tftp directory is: / home/ubuntu/disk-2/tftpboot. First of all, the server needs to be configured with nfs and tftp, which have a lot of information on the Internet and are omitted here.