This flash drive can then be accessed using programs and applications on the host computer. On the host computer, this causes the port to look like mass storage device (like a USB Flash drive). Fundamentally, what this command does is it exports a chosen block device as a mass storage device over a chosen USB port. If you're using a TechNexion development kit baseboard, please review the baseboard user guide.
DSCHINNI U BOOT SERIAL
To access the U-boot command prompt, you have to have a serial console connection between the target board and a host computer (usually the one you're using to load the flash). While TechNexion kits have a true dual-role (USB OTG) port, if you're using the USB port to load Flash or to debug, it only needs to operate as a device port. You can use our baseboard schematics as a reference for this. If you're using a custom baseboard (or carrier board), you are highly recommended to put a USB connector on the board and to connect it to the USB OTG port on the SOM connector.
DSCHINNI U BOOT ANDROID
With Android, it is also the default communications port for the Android Debugger (ADB). It is extremely useful for loading e.MMC. This is a standard feature on all TechNexion development kits. The target must also have an operating USB OTG connection. This is the version of U-boot we utilize in Yocto 2.5 (Sumo), as well as Android 9 (Pie). We've enabled this command as a standard setting in our maintained version of U-boot version 2018.03 and later. One requirement to use this method is that the board must also boot from either e.MMC or microSD card with a version of U-boot that has the ums command enabled. Requirements U-boot must be running on the target system The main drawback of this method is that you also have to have a serial console connection to the target board in order to execute the necessary U-boot commands. configuration jumpers or boot mode switches), and you can use off-the-shelf tools to perform the actual transfer via USB OTG. You don't have to change any boot mode settings on the board (e.g. The main advantage of this method is convenience. This method is to use U-boot's ums command. This article discusses one of several possible methods used to load the Flash. However, there could be many partitions depending on the setup, if you have an A/B partitioning scheme. Usually, there are a minimum of two partitions (boot, and root filesystem). One of the first things developers need to be able to do when working embedded products is to load images onto it.Īn "image" in this case, is a monolithic digital file that comprises the entirety of the content of the EMMC (or microSD card, if applicable), from the boot partition, through the Secondary Program Loader (SPL), through the various partitions.
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