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bootm - boot application image from memory.
I created the following list using the output from invocations of helpkerneladdr address to which the file specified by the -kernel parameter of QEMU shall be loaded. A Selection of Annotated U-Boot Commands. The qfw load command is used to load a kernel and an initial RAM disk. The qfw cpus sub-command displays the available CPUs. The qfw list sub-command displays the QEMU firmware files.
U boot commands code#
Next, we will use the following code to view the SD card partition. We can use mmc part to view all these partitions, but first we will need to make sure we are on the SD card by using the following code: mmc dev 0 u-boot> fatload mmc 0 0×3000000 uImage u-boot> fatload mmc 0 0x2A00000 devicetree. Note that sometimes SD cards or EMMC may have multiple partitions. The following U-Boot commands illustrate loading the Linux kernel uImage, a mkimage wrapped ramdisk, and a device tree into memory from the SD card and then booting the Linux kernel. If part is left blank, it will default to partition 0. Where dev is used to specify the MMC device to switch to, and part is the partition. The mmc dev command is used to change and set the current MMC device. Note that SD cards will always be set as the current MMC device by default.
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We can see that we currently have one MMC device on our development board, which is 0 (SD). Mmc list is used to check the number of MMC devices that are currently connected to the SD card. Mmc rescan is used to scan MMC devices on the current development board. We can see that the current MMC device is a SD card, with the version number being 3.0, and having a capacity of 14.7 GiB, along with other information. The command is used directly without any other components.
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Mmc info is mainly used to return the device information of the selected MMC. This article talks about the U-Boot EMMC and SD card operation commands that are used most commonly.įor related subjects, please refer to the SOC Table of Contents. Linux based Application and Development.