本来想看看/etc/bootparams是用来做什么的，里面有什么内容，但是没有发现

cat /etc/bootparams
cat: cannot open /etc/bootparams

boot parameter data base
The bootparams file contains a list of client  entries  that
     diskless  clients  use for booting. Diskless booting clients
     retrieve this information by issuing requests  to  a  server
     running  the rpc.bootparamd(1M) program. The bootparams file
     may be used in conjunction with or in place of other sources
     for the bootparams information.  See nsswitch.conf(4).

     For each client the file contains an entry with the client's
     name  and  a  list of boot parameter values for that client.
     Each entry should have the form:

     clientname    identifier-specifier ...

     The first item of each entry is the host name of  the  disk-
     less  client.  The asterisk ('*') character may be used as a
     "wildcard" in place of the client name in  a  single  entry.
     That  entry  will apply to all clients for whom there is not
     an entry that specifically names them.

     This is followed by one or more whitespace characters and  a
     series  of  identifier-specifiers  separated  by  whitespace
     characters.

     Each identifier-specifier has the form:

     identifier=serverathname

     or

     identifier=domain-name

     The first form is  used  for  file-specific  identifiers.  A
     file-specific  identifier  is a key that is used by diskless
     clients to identify a file or filesystem. server is the name
     of  the  server  that will provide the file or filesystem to
     the diskless  client,  and  pathname  is  the  path  to  the
     exported  file  or  filesystem  on the specified server. The
     equal sign ('=') and colon (':') characters are used in  the