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4f73bc4dd3
The option allows you to remove TTY and compile without errors. This saves space on systems that won't support TTY interfaces anyway. bloat-o-meter output is below. The bulk of this patch consists of Kconfig changes adding "depends on TTY" to various serial devices and similar drivers that require the TTY layer. Ideally, these dependencies would occur on a common intermediate symbol such as SERIO, but most drivers "select SERIO" rather than "depends on SERIO", and "select" does not respect dependencies. bloat-o-meter output comparing our previous minimal to new minimal by removing TTY. The list is filtered to not show removed entries with awk '$3 != "-"' as the list was very long. add/remove: 0/226 grow/shrink: 2/14 up/down: 6/-35356 (-35350) function old new delta chr_dev_init 166 170 +4 allow_signal 80 82 +2 static.__warned 143 142 -1 disallow_signal 63 62 -1 __set_special_pids 95 94 -1 unregister_console 126 121 -5 start_kernel 546 541 -5 register_console 593 588 -5 copy_from_user 45 40 -5 sys_setsid 128 120 -8 sys_vhangup 32 19 -13 do_exit 1543 1526 -17 bitmap_zero 60 40 -20 arch_local_irq_save 137 117 -20 release_task 674 652 -22 static.spin_unlock_irqrestore 308 260 -48 Signed-off-by: Joe Millenbach <jmillenbach@gmail.com> Reviewed-by: Jamey Sharp <jamey@minilop.net> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
81 lines
3.2 KiB
Plaintext
81 lines
3.2 KiB
Plaintext
#
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# SLIP network device configuration
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#
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config SLIP
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tristate "SLIP (serial line) support"
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depends on TTY
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---help---
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Say Y if you intend to use SLIP or CSLIP (compressed SLIP) to
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connect to your Internet service provider or to connect to some
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other local Unix box or if you want to configure your Linux box as a
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Slip/CSlip server for other people to dial in. SLIP (Serial Line
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Internet Protocol) is a protocol used to send Internet traffic over
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serial connections such as telephone lines or null modem cables;
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nowadays, the protocol PPP is more commonly used for this same
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purpose.
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Normally, your access provider has to support SLIP in order for you
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to be able to use it, but there is now a SLIP emulator called SLiRP
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around (available from
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<ftp://ibiblio.org/pub/Linux/system/network/serial/>) which
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allows you to use SLIP over a regular dial up shell connection. If
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you plan to use SLiRP, make sure to say Y to CSLIP, below. The
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NET-3-HOWTO, available from
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<http://www.tldp.org/docs.html#howto>, explains how to
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configure SLIP. Note that you don't need this option if you just
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want to run term (term is a program which gives you almost full
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Internet connectivity if you have a regular dial up shell account on
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some Internet connected Unix computer. Read
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<http://www.bart.nl/~patrickr/term-howto/Term-HOWTO.html>). SLIP
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support will enlarge your kernel by about 4 KB. If unsure, say N.
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To compile this driver as a module, choose M here. The module
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will be called slip.
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config SLHC
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tristate
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---help---
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This option enables Van Jacobsen serial line header compression
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routines.
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if SLIP
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config SLIP_COMPRESSED
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bool "CSLIP compressed headers"
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depends on SLIP
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select SLHC
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---help---
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This protocol is faster than SLIP because it uses compression on the
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TCP/IP headers (not on the data itself), but it has to be supported
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on both ends. Ask your access provider if you are not sure and
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answer Y, just in case. You will still be able to use plain SLIP. If
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you plan to use SLiRP, the SLIP emulator (available from
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<ftp://ibiblio.org/pub/Linux/system/network/serial/>) which
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allows you to use SLIP over a regular dial up shell connection, you
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definitely want to say Y here. The NET-3-HOWTO, available from
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<http://www.tldp.org/docs.html#howto>, explains how to configure
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CSLIP. This won't enlarge your kernel.
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config SLIP_SMART
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bool "Keepalive and linefill"
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depends on SLIP
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---help---
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Adds additional capabilities to the SLIP driver to support the
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RELCOM line fill and keepalive monitoring. Ideal on poor quality
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analogue lines.
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config SLIP_MODE_SLIP6
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bool "Six bit SLIP encapsulation"
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depends on SLIP
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---help---
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Just occasionally you may need to run IP over hostile serial
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networks that don't pass all control characters or are only seven
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bit. Saying Y here adds an extra mode you can use with SLIP:
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"slip6". In this mode, SLIP will only send normal ASCII symbols over
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the serial device. Naturally, this has to be supported at the other
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end of the link as well. It's good enough, for example, to run IP
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over the async ports of a Camtec JNT Pad. If unsure, say N.
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endif # SLIP
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