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authorVincent Whitchurch <vincent.whitchurch@axis.com>2022-03-10 13:42:30 +0100
committerRichard Weinberger <richard@nod.at>2022-03-11 10:50:42 +0100
commit4ef5a0b2e1b806203831b0a7a044539f6627116a (patch)
tree3f0da98141e942a34b974162b9a573cbafec1eb2 /Documentation/virt/uml
parent0e6d630cef8b72de6f4573c894b479bdf091c1e5 (diff)
docs: UML: Mention telnetd for port channel
It is not obvious from the documentation that using the "port" channel for the console requires telnetd to be installed (see port_connection() in arch/um/drivers/port_user.c). Mention this, and the fact that UML will not boot until a client connects. Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com> Acked-by: Anton Ivanov <anton.ivanov@cambridgegreys.com> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'Documentation/virt/uml')
-rw-r--r--Documentation/virt/uml/user_mode_linux_howto_v2.rst6
1 files changed, 5 insertions, 1 deletions
diff --git a/Documentation/virt/uml/user_mode_linux_howto_v2.rst b/Documentation/virt/uml/user_mode_linux_howto_v2.rst
index 81986fe014d4..863f67b72c05 100644
--- a/Documentation/virt/uml/user_mode_linux_howto_v2.rst
+++ b/Documentation/virt/uml/user_mode_linux_howto_v2.rst
@@ -664,7 +664,11 @@ one is input, the second one output.
* The fd channel - use file descriptor numbers for input/output. Example:
``con1=fd:0,fd:1.``
-* The port channel - listen on TCP port number. Example: ``con1=port:4321``
+* The port channel - start a telnet server on TCP port number. Example:
+ ``con1=port:4321``. The host must have /usr/sbin/in.telnetd (usually part of
+ a telnetd package) and the port-helper from the UML utilities (see the
+ information for the xterm channel below). UML will not boot until a client
+ connects.
* The pty and pts channels - use system pty/pts.