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-rw-r--r--Documentation/nfsroot.txt12
-rw-r--r--net/ipv4/ipconfig.c20
2 files changed, 10 insertions, 22 deletions
diff --git a/Documentation/nfsroot.txt b/Documentation/nfsroot.txt
index 16a7cae2721d..9b956a969362 100644
--- a/Documentation/nfsroot.txt
+++ b/Documentation/nfsroot.txt
@@ -92,8 +92,14 @@ ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>
autoconfiguration.
The <autoconf> parameter can appear alone as the value to the `ip'
- parameter (without all the ':' characters before) in which case auto-
- configuration is used.
+ parameter (without all the ':' characters before). If the value is
+ "ip=off" or "ip=none", no autoconfiguration will take place, otherwise
+ autoconfiguration will take place. The most common way to use this
+ is "ip=dhcp".
+
+ Note that "ip=off" is not the same thing as "ip=::::::off", because in
+ the latter autoconfiguration will take place if any of DHCP, BOOTP or RARP
+ are compiled in the kernel.
<client-ip> IP address of the client.
@@ -142,7 +148,7 @@ ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>
into the kernel will be used, regardless of the value of
this option.
- off or none: don't use autoconfiguration (default)
+ off or none: don't use autoconfiguration
on or any: use any protocol available in the kernel
dhcp: use DHCP
bootp: use BOOTP
diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index c5c107a01823..96400b0bd08a 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -1396,25 +1396,7 @@ late_initcall(ip_auto_config);
/*
* Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
- * command line parameter. It consists of option fields separated by colons in
- * the following order:
- *
- * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
- *
- * Any of the fields can be empty which means to use a default value:
- * <client-ip> - address given by BOOTP or RARP
- * <server-ip> - address of host returning BOOTP or RARP packet
- * <gw-ip> - none, or the address returned by BOOTP
- * <netmask> - automatically determined from <client-ip>, or the
- * one returned by BOOTP
- * <host name> - <client-ip> in ASCII notation, or the name returned
- * by BOOTP
- * <device> - use all available devices
- * <PROTO>:
- * off|none - don't do autoconfig at all (DEFAULT)
- * on|any - use any configured protocol
- * dhcp|bootp|rarp - use only the specified protocol
- * both - use both BOOTP and RARP (not DHCP)
+ * command line parameter. See Documentation/nfsroot.txt.
*/
static int __init ic_proto_name(char *name)
{