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Add persistent symlinks for MTD devices like SPI-NOR flash, based on the partition names specified on the cmdline, in a Device Tree, or by other MTD partitioning parser drivers. Using the persistent name can be preferable to using the numbered /dev/mtdX device, as the latter can change depending on probe order or when partitioning has changed.
Files in this directory contain configuration for systemd-udevd.service, a daemon that manages symlinks to device nodes, permissions of devices nodes, emits device events for userspace, and renames network interfaces. See man:udev(7) for an overview of the configuration file format, and man:systemd-udevd.service(8) for a description of service itself. Use 'systemd-analyze cat-config udev/rules.d' to display the effective config.