Re: PATCH: Enable IP PNP for 2.4.4-ac8

H . J . Lu
2001-05-13T18:07:39Z

On Sun, May 13, 2001 at 10:31:03AM -0600, Eric W. Biederman wrote:
> "H . J . Lu" <hjl@lucon.org> writes:
>
> > On Fri, May 11, 2001 at 04:28:05PM -0700, David S. Miller wrote:
> > >
> > > H . J . Lu writes:
> > > > 2.4.4-ac8 disables IP auto config by default even if CONFIG_IP_PNP is
> > > > defined. Here is a patch.
> > >
> > > It doesn't make any sense to enable this unless parameters are
> > > given to the kernel via the kernel command line or from firmware
> > > settings.
> >
> > >From Configure.help:
> >
> > IP: kernel level autoconfiguration
> > CONFIG_IP_PNP
> > This enables automatic configuration of IP addresses of devices and
> > of the routing table during kernel boot, based on either information
> > supplied on the kernel command line or by BOOTP or RARP protocols.
> > You need to say Y only for diskless machines requiring network
> > access to boot (in which case you want to say Y to "Root file system
> > on NFS" as well), because all other machines configure the network
> > in their startup scripts.
> >
> > It works fine for 2.4.4. However, in 2.4.4-ac8, even if I select
> > CONFIG_IP_PNP, I have to pass ip=xxxx to kernel, in addition to
> > nfsroot=x.x.x.x:/foo/bar. With 2.4.4, I can just pass
> > nfsroot=x.x.x.x:/foo/bar to kernel.
>
> O.k. Configure.help needs to be updated. "ip=on" or "ip=bootp" or
> "ip=dhcp" work fine. I wonder if I forgot to forward port the docs?

It doesn't make any senses. When I specify CONFIG_IP_PNP and
BOOTP/DHCP, I want a kernel with IP config using BOOTP/DHCP. I would
expect IP config is turned for BOOTP/DHCP by default. You can turn
it off by passing "ip=off" to kernel. Did I miss something?

>
> This same situation exists for 2.2.18 & 2.2.19 as well.
>
> The only way to get long term stability out of this is to write
> a user space client, you can put in a ramdisk. One of these days...

It doesn't work with diskless machines which don't support ramdisk
during boot.

H.J.