# # The 8250/16550 serial drivers. You shouldn't be in this list unless # you somehow have an implicit or explicit dependency on SERIAL_8250. # config SERIAL_8250 tristate "8250/16550 and compatible serial support" select SERIAL_CORE ---help--- This selects whether you want to include the driver for the standard serial ports. The standard answer is Y. People who might say N here are those that are setting up dedicated Ethernet WWW/FTP servers, or users that have one of the various bus mice instead of a serial mouse and don't intend to use their machine's standard serial port for anything. (Note that the Cyclades and Stallion multi serial port drivers do not need this driver built in for them to work.) To compile this driver as a module, choose M here: the module will be called 8250. [WARNING: Do not compile this driver as a module if you are using non-standard serial ports, since the configuration information will be lost when the driver is unloaded. This limitation may be lifted in the future.] BTW1: If you have a mouseman serial mouse which is not recognized by the X window system, try running gpm first. BTW2: If you intend to use a software modem (also called Winmodem) under Linux, forget it. These modems are crippled and require proprietary drivers which are only available under Windows. Most people will say Y or M here, so that they can use serial mice, modems and similar devices connecting to the standard serial ports. config SERIAL_8250_DEPRECATED_OPTIONS bool "Support 8250_core.* kernel options (DEPRECATED)" depends on SERIAL_8250 default y ---help--- In 3.7 we renamed 8250 to 8250_core by mistake, so now we have to accept kernel parameters in both forms like 8250_core.nr_uarts=4 and 8250.nr_uarts=4. We now renamed the module back to 8250, but if anybody noticed in 3.7 and changed their userspace we still have to keep the 8350_core.* options around until they revert the changes they already did. If 8250 is built as a module, this adds 8250_core alias instead. If you did not notice yet and/or you have userspace from pre-3.7, it is safe (and recommended) to say N here. config SERIAL_8250_PNP bool "8250/16550 PNP device support" if EXPERT depends on SERIAL_8250 && PNP default y ---help--- This builds standard PNP serial support. You may be able to disable this feature if you only need legacy serial support. config SERIAL_8250_CONSOLE bool "Console on 8250/16550 and compatible serial port" depends on SERIAL_8250=y select SERIAL_CORE_CONSOLE ---help--- If you say Y here, it will be possible to use a serial port as the system console (the system console is the device which receives all kernel messages and warnings and which allows logins in single user mode). This could be useful if some terminal or printer is connected to that serial port. Even if you say Y here, the currently visible virtual console (/dev/tty0) will still be used as the system console by default, but you can alter that using a kernel command line option such as "console=ttyS1". (Try "man bootparam" or see the documentation of your boot loader (grub or lilo or loadlin) about how to pass options to the kernel at boot time.) If you don't have a VGA card installed and you say Y here, the kernel will automatically use the first serial line, /dev/ttyS0, as system console. You can set that using a kernel command line option such as "console=uart8250,io,0x3f8,9600n8" "console=uart8250,mmio,0xff5e0000,115200n8". and it will switch to normal serial console when the corresponding port is ready. "earlycon=uart8250,io,0x3f8,9600n8" "earlycon=uart8250,mmio,0xff5e0000,115200n8". it will not only setup early console. If unsure, say N. config FIX_EARLYCON_MEM bool depends on X86 default y config SERIAL_8250_GSC tristate depends on SERIAL_8250 && GSC default SERIAL_8250 config SERIAL_8250_DMA bool "DMA support for 16550 compatible UART controllers" if EXPERT depends on SERIAL_8250 && DMADEVICES=y default SERIAL_8250 help This builds DMA support that can be used with 8250/16650 compatible UART controllers that support DMA signaling. config SERIAL_8250_PCI tristate "8250/16550 PCI device support" if EXPERT depends on SERIAL_8250 && PCI default SERIAL_8250 help This builds standard PCI serial support. You may be able to disable this feature if you only need legacy serial support. Saves about 9K. config SERIAL_8250_HP300 tristate depends on SERIAL_8250 && HP300 default SERIAL_8250 config SERIAL_8250_CS tristate "8250/16550 PCMCIA device support" depends on PCMCIA && SERIAL_8250 ---help--- Say Y here to enable support for 16-bit PCMCIA serial devices, including serial port cards, modems, and the modem functions of multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are credit-card size devices often used with laptops.) To compile this driver as a module, choose M here: the module will be called serial_cs. If unsure, say N. config SERIAL_8250_NR_UARTS int "Maximum number of 8250/16550 serial ports" depends on SERIAL_8250 default "4" help Set this to the number of serial ports you want the driver to support. This includes any ports discovered via ACPI or PCI enumeration and any ports that may be added at run-time via hot-plug, or any ISA multi-port serial cards. config SERIAL_8250_RUNTIME_UARTS int "Number of 8250/16550 serial ports to register at runtime" depends on SERIAL_8250 range 0 SERIAL_8250_NR_UARTS default "4" help Set this to the maximum number of serial ports you want the kernel to register at boot time. This can be overridden with the module parameter "nr_uarts", or boot-time parameter 8250.nr_uarts config SERIAL_8250_EXTENDED bool "Extended 8250/16550 serial driver options" depends on SERIAL_8250 help If you wish to use any non-standard features of the standard "dumb" driver, say Y here. This includes HUB6 support, shared serial interrupts, special multiport support, support for more than the four COM 1/2/3/4 boards, etc. Note that the answer to this question won't directly affect the kernel: saying N will just cause the configurator to skip all the questions about serial driver options. If unsure, say N. config SERIAL_8250_MANY_PORTS bool "Support more than 4 legacy serial ports" depends on SERIAL_8250_EXTENDED && !IA64 help Say Y here if you have dumb serial boards other than the four standard COM 1/2/3/4 ports. This may happen if you have an AST FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>), or other custom serial port hardware which acts similar to standard serial port hardware. If you only use the standard COM 1/2/3/4 ports, you can say N here to save some memory. You can also say Y if you have an "intelligent" multiport card such as Cyclades, Digiboards, etc. # # Multi-port serial cards # config SERIAL_8250_FOURPORT tristate "Support Fourport cards" depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS help Say Y here if you have an AST FourPort serial board. To compile this driver as a module, choose M here: the module will be called 8250_fourport. config SERIAL_8250_ACCENT tristate "Support Accent cards" depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS help Say Y here if you have an Accent Async serial board. To compile this driver as a module, choose M here: the module will be called 8250_accent. config SERIAL_8250_BOCA tristate "Support Boca cards" depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS help Say Y here if you have a Boca serial board. Please read the Boca mini-HOWTO, available from <http://www.tldp.org/docs.html#howto> To compile this driver as a module, choose M here: the module will be called 8250_boca. config SERIAL_8250_EXAR_ST16C554 tristate "Support Exar ST16C554/554D Quad UART" depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS help The Uplogix Envoy TU301 uses this Exar Quad UART. If you are tinkering with your Envoy TU301, or have a machine with this UART, say Y here. To compile this driver as a module, choose M here: the module will be called 8250_exar_st16c554. config SERIAL_8250_HUB6 tristate "Support Hub6 cards" depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS help Say Y here if you have a HUB6 serial board. To compile this driver as a module, choose M here: the module will be called 8250_hub6. # # Misc. options/drivers. # config SERIAL_8250_SHARE_IRQ bool "Support for sharing serial interrupts" depends on SERIAL_8250_EXTENDED help Some serial boards have hardware support which allows multiple dumb serial ports on the same board to share a single IRQ. To enable support for this in the serial driver, say Y here. config SERIAL_8250_DETECT_IRQ bool "Autodetect IRQ on standard ports (unsafe)" depends on SERIAL_8250_EXTENDED help Say Y here if you want the kernel to try to guess which IRQ to use for your serial port. This is considered unsafe; it is far better to configure the IRQ in a boot script using the setserial command. If unsure, say N. config SERIAL_8250_RSA bool "Support RSA serial ports" depends on SERIAL_8250_EXTENDED help ::: To be written ::: config SERIAL_8250_ACORN tristate "Acorn expansion card serial port support" depends on ARCH_ACORN && SERIAL_8250 help If you have an Atomwide Serial card or Serial Port card for an Acorn system, say Y to this option. The driver can handle 1, 2, or 3 port cards. If unsure, say N. config SERIAL_8250_FSL bool depends on SERIAL_8250_CONSOLE && PPC_UDBG_16550 default PPC config SERIAL_8250_DW tristate "Support for Synopsys DesignWare 8250 quirks" depends on SERIAL_8250 help Selecting this option will enable handling of the extra features present in the Synopsys DesignWare APB UART. config SERIAL_8250_EM tristate "Support for Emma Mobile integrated serial port" depends on SERIAL_8250 && ARM && HAVE_CLK help Selecting this option will add support for the integrated serial port hardware found on the Emma Mobile line of processors. If unsure, say N. config SERIAL_8250_RT288X bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support" depends on SERIAL_8250 && (SOC_RT288X || SOC_RT305X || SOC_RT3883) help If you have a Ralink RT288x/RT305x SoC based board and want to use the serial port, say Y to this option. The driver can handle up to 2 serial ports. If unsure, say N.