Change the following kernel options to environment variables:

    BOOTP -> bootp
    BOOTP_NFSROOT -> bootp.nfsroot
    BOOTP_NFSV3 -> bootp.nfsv3
    BOOTP_COMPAT -> bootp.compat
    BOOTP_WIRED_TO -> bootp.wired_to

This lets you PXE boot with a GENERIC kernel by putting this sort of thing
in loader.conf:

    bootp="YES"
    bootp.nfsroot="YES"
    bootp.nfsv3="YES"
    bootp.wired_to="bge1"

or even setting the variables manually from the OK prompt.

2 files changed, 24 insertions, 1 deletions

diff --git a/sys/boot/common/dev_net.c b/sys/boot/common/dev_net.c
index b7ccbca..2e136c4 100644
--- a/sys/boot/common/dev_net.c
+++ b/sys/boot/common/dev_net.c
@@ -273,7 +273,7 @@ net_getparams(sock)
     /*  
      * If present, strip the server's address off of the rootpath
      * before passing it along.  This allows us to be compatible with
-     * the kernel's diskless (BOOTP_NFSROOT) booting conventions
+     * the kernel's diskless (kenv bootp.nfsroot=1) booting conventions
      */
     for (i = 0; rootpath[i] != '\0' && i < FNAME_SIZE; i++)
 	    if (rootpath[i] == ':')
diff --git a/sys/boot/common/loader.8 b/sys/boot/common/loader.8
index a77a828..958b33b 100644
--- a/sys/boot/common/loader.8
+++ b/sys/boot/common/loader.8
@@ -352,6 +352,29 @@ by the kernel during the boot phase.
 List of semicolon-separated search path for bootable kernels.
 The default is
 .Dq Li kernel;kernel.old .
+.It Va bootp
+Setting this variable tells the kernel to use BOOTP to obtain an IP address
+and hostname at boot time.
+The kernel must be built with
+.Dv NFSCLIENT
+and
+.Dv NFS_ROOT
+defined.
+.It Va bootp.compat
+Setting this variable enables a workaround for broken BOOTP daemons.
+.It Va bootp.nfsroot
+Setting this variable tells the kernel to NFS mount the root filesystem using
+BOOTP information.
+.It Va bootp.nfsv3
+Setting this variable tells the kernel to use NFS version 3 to mount the root
+filesystem.
+.It Va bootp.wired_to
+This variable may be set to the name of the interface that is to be used to
+boot from when
+.Va bootp
+is set.
+If it is not set, the system will attempt to boot from all available
+interfaces, using the first one found.
 .It Va console
 Defines the current console.
 .It Va currdev