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-rw-r--r--Documentation/filesystems/nfs/nfsroot.txt34
1 files changed, 29 insertions, 5 deletions
diff --git a/Documentation/filesystems/nfs/nfsroot.txt b/Documentation/filesystems/nfs/nfsroot.txt
index 1513e5d663fd..a1030bea60d3 100644
--- a/Documentation/filesystems/nfs/nfsroot.txt
+++ b/Documentation/filesystems/nfs/nfsroot.txt
@@ -110,6 +110,9 @@ ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>:
will not be triggered if it is missing and NFS root is not
in operation.
+ Value is exported to /proc/net/pnp with the prefix "bootserver "
+ (see below).
+
Default: Determined using autoconfiguration.
The address of the autoconfiguration server is used.
@@ -165,12 +168,33 @@ ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>:
Default: any
- <dns0-ip> IP address of first nameserver.
- Value gets exported by /proc/net/pnp which is often linked
- on embedded systems by /etc/resolv.conf.
+ <dns0-ip> IP address of primary nameserver.
+ Value is exported to /proc/net/pnp with the prefix "nameserver "
+ (see below).
+
+ Default: None if not using autoconfiguration; determined
+ automatically if using autoconfiguration.
+
+ <dns1-ip> IP address of secondary nameserver.
+ See <dns0-ip>.
+
+ After configuration (whether manual or automatic) is complete, a file is
+ created at /proc/net/pnp in the following format; lines are omitted if
+ their respective value is empty following configuration.
+
+ #PROTO: <DHCP|BOOTP|RARP|MANUAL> (depending on configuration method)
+ domain <dns-domain> (if autoconfigured, the DNS domain)
+ nameserver <dns0-ip> (primary name server IP)
+ nameserver <dns1-ip> (secondary name server IP)
+ nameserver <dns2-ip> (tertiary name server IP)
+ bootserver <server-ip> (NFS server IP)
+
+ <dns-domain> and <dns2-ip> are requested during autoconfiguration; they
+ cannot be specified as part of the "ip=" kernel command line parameter.
- <dns1-ip> IP address of second nameserver.
- Same as above.
+ Because the "domain" and "nameserver" options are recognised by DNS
+ resolvers, /etc/resolv.conf is often linked to /proc/net/pnp on systems
+ that use an NFS root filesystem.
nfsrootdebug