With input from the current discussion and ignorance of upcoming
netroot patches the current documentation would/should look like
the following:
DHCP
----
Format:
root=dhcp
Get IP from dhcp, use dhcp root-path option to specify root location.
Contents according to formats below.
Please note: Specifying root=dhcp will ignore further netroot options
NFS
---
Preferred format:
root=nfs[4]:[server:]path[:options]
Legacy formats:
root=[[/dev/]nfs[4]] nfsroot=[server:]path[,options]
root=[[/dev/]nfs[4]] nfsroot=[server:]path[:options]
If the 'nfsroot' parameter is not given on the command line or is empty,
the dhcp root-path is used as [server:]path[:options] or the default
"/tftpboot/%s" will be used.
If server is unspecified it will be pulled from one of the following
sources, in order:
static ip= option on kernel command line
DHCP next-server option
DHCP server-id option
DHCP root-path option
NFSv4 is only used if explicitly requested; default is NFSv2 or NFSv3
depending on kernel configuration
iSCSI
-----
Preferred format:
root=iscsi:[<servername>]:[<protocol>]:[<port>]:[<LUN>]:<targetname>
Legacy formats:
root=[iscsi]
iscsiroot=[<servername>]:[<protocol>]:[<port>]:[<LUN>]:<targetname>
root=[iscsi] iscsi_firmware
NBD
---
Preferred format:
root=nbd:srv:port[:fstype[:rootflags[:nbdopts]]]
Legacy formats:
root=[nbd] nbdroot=srv,port
root=[nbd] nbdroot=srv:port[:fstype[:rootflags[:nbdopts]]]
nbdopts is a comma seperated list of options to give to nbd-client
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