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# SPDX-License-Identifier: GPL-2.0## Character device configuration#menu "Character devices"source "drivers/tty/Kconfig"config DEVMEM bool "/dev/mem virtual device support" default y help Say Y here if you want to support the /dev/mem device. The /dev/mem device is used to access areas of physical memory. When in doubt, say "Y".config DEVKMEM bool "/dev/kmem virtual device support" # On arm64, VMALLOC_START < PAGE_OFFSET, which confuses kmem read/write depends on !ARM64 help Say Y here if you want to support the /dev/kmem device. The /dev/kmem device is rarely used, but can be used for certain kind of kernel debugging operations. When in doubt, say "N".config SGI_SNSC bool "SGI Altix system controller communication support" depends on (IA64_SGI_SN2 || IA64_GENERIC) help If you have an SGI Altix and you want to enable system controller communication from user space (you want this!), say Y. Otherwise, say N.config SGI_TIOCX bool "SGI TIO CX driver support" depends on (IA64_SGI_SN2 || IA64_GENERIC) help If you have an SGI Altix and you have fpga devices attached to your TIO, say Y here, otherwise say N.config SGI_MBCS tristate "SGI FPGA Core Services driver support" depends on SGI_TIOCX help If you have an SGI Altix with an attached SABrick say Y or M here, otherwise say N.source "drivers/tty/serial/Kconfig"source "drivers/tty/serdev/Kconfig"config TTY_PRINTK tristate "TTY driver to output user messages via printk" depends on EXPERT && TTY default n ---help--- If you say Y here, the support for writing user messages (i.e. console messages) via printk is available. The feature is useful to inline user messages with kernel messages. In order to use this feature, you should output user messages to /dev/ttyprintk or redirect console to this TTY. If unsure, say N.config TTY_PRINTK_LEVEL depends on TTY_PRINTK int "ttyprintk log level (1-7)" range 1 7 default "6" help Printk log level to use for ttyprintk messages.config PRINTER tristate "Parallel printer support" depends on PARPORT ---help--- If you intend to attach a printer to the parallel port of your Linux box (as opposed to using a serial printer; if the connector at the printer has 9 or 25 holes ["female"], then it's serial), say Y. Also read the Printing-HOWTO, available from <http://www.tldp.org/docs.html#howto>. It is possible to share one parallel port among several devices (e.g. printer and ZIP drive) and it is safe to compile the corresponding drivers into the kernel. To compile this driver as a module, choose M here and read <file:Documentation/admin-guide/parport.rst>. The module will be called lp.