Date: Fri, 25 Sep 2015 19:23:38 -0400 (EDT) From: Rick Macklem <rmacklem@uoguelph.ca> To: Ian Lepore <ian@freebsd.org> Cc: Hans Petter Selasky <hps@selasky.org>, Randy Westlund <rwestlun@gmail.com>, freebsd-arm@freebsd.org, Rick Macklem <rmacklem@FreeBSD.org> Subject: Re: NFS Root with Raspberry Pi (nfs_diskless: no interface) Message-ID: <1384966087.11358042.1443223418540.JavaMail.zimbra@uoguelph.ca> In-Reply-To: <1443142468.1224.322.camel@freebsd.org> References: <20150922052522.GA62140@gmail.com> <91AAC64E-4C38-47AA-8910-48F7654A7524@cs.huji.ac.il> <20150923174445.GE43653@gmail.com> <CFAAFAE2-F0B2-431B-93C6-61D66464B7FD@cs.huji.ac.il> <1443105426.1224.272.camel@freebsd.org> <20150924163658.GC32257@gmail.com> <560438C5.3090404@selasky.org> <1443142468.1224.322.camel@freebsd.org>
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Ian Lepore wrote:
> On Thu, 2015-09-24 at 19:54 +0200, Hans Petter Selasky wrote:
> > On 09/24/15 18:36, Randy Westlund wrote:
> > > On Thu, Sep 24, 2015 at 08:37:06AM -0600, Ian Lepore wrote:
> >
> > >>>[orig problem description: basically nfsroot without BOOTP fails]
> >
> > >> Try setting boot.netif.name="ue0" in loader.conf. I've never tried
> > >> that, but in looking at the code, there's some chance it could work. :)
> > >>
> > >> What I do is put these options into my RPi kernel config:
> > >>
> > >> options BOOTP
> > >> options BOOTP_NFSROOT
> > >> options BOOTP_NFSV3
> > >> options BOOTP_WIRED_TO=ue0
> > >>
> > >> But this requires configuring a bootp or dhcp server to provide the
> > >> info. It should be possible to netboot without using BOOTP.
> > >>
> > >> -- Ian
> > >
> > > No luck with boot.netif.name.
> > >
> > > I'm using the kernel that comes in the FreeBSD RPI-B disk image. Is
> > > there a way to see what it was built with? I tried running strings on
> > > the kernel, but I'm not sure what to look for. Otherwise I guess I'll
> > > build one myself.
> > >
> > > Randy
> > >
> >
> > Hi,
> >
> > The problem is that the code in:
> >
> > sys/nfs/bootp_subr.c: SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF,
> > SI_ORDER_FIRST, bootpc_init, NULL);
> >
> > doesn't wait for the USB ethernet device to be enumerated. Only the
> > vfs_mountroot() code which is running from the init-process does so.
> >
> > Not sure what the best way to solve this is. Try putting:
> >
> > pause("W", hz * 4);
> >
> > Into the beginning of the "bootpc_init()" function.
> >
> > --HPS
>
> I had time to look into this today. The bootpc_init() routine *does*
> wait for an interface to appear. The problem in this case is that BOOTP
> isn't involved, and the nfs_setup_diskless() routine doesn't have a
> similar wait loop for slow interfaces. The attached patch adds it, and
> with it I can nfsmount root on my RPi without using the BOOTP_foo
> options I listed above.
>
> Rick, does this patch look okay to you? If no objections, I'll commit
> this asap.
>
Looks fine to me. (I might have selected a name for the timeout with NFS
in it, just in case someone defines IFACE_TIMEOUT_SECS for something else,
but I'll leave it up to you.)
Thanks for patching this, rick
> -- Ian
>
>
>
> [Text Documents:nfs_diskless_iface_timeout.diff]
>
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