diskless boot, nfs server behind router

[alexs at ulgsm.ru]

* Rick Macklem <rmacklem at uoguelph.ca> [2010-06-28 20:41:17 -0400]:

> 
> 
> On Mon, 28 Jun 2010, Daniel Braniss wrote:
> 
> >>
> >>
> >> On Mon, 28 Jun 2010, alexs at ulgsm.ru wrote:
> >>
> >>>
> >>>
> >>> kernel built with:
> >>> options     BOOTP          # Use BOOTP to obtain IP address/hostname
> >>> options     BOOTP_NFSROOT  # NFS mount root file system using BOOTP info
> >>> options     BOOTP_NFSV3
> >>>
> >> Try building a kernel without the above options, but with
> >> options NFS_ROOT
> >> specified. I think that's what most pxeboot users do and it was what
> >> I had assumed when I looked at the code.
> >>
> >> If that doesn't fix the problem...I haven't got a solution for you, rick
> >
> > I use:
> > options         BOOTP_NFSV3             # Use NFS v3 to NFS mount root
> >
> Looking at the code, it appears that BOOTP_NFSROOT doesn't set mygateway
> in the nfs_diskless structure, which would explain why the mount of root
> in the kernel doesn't work.
> 
> I think using NFS_ROOT but not the BOOTPxxx options will work around this
> or you could test the following patch and see if it helps. (Testing the
> patch would be appreciated, since I don't have any way to test across
> multiple subnets and it would be nice to have a fix for the BOOTPxxx
> cases.)
> 
> rick
> --- untested patch for bootp_subr.c ---
> --- nfsclient/bootp_subr.c.sav	2010-06-28 19:16:02.000000000 -0400
> +++ nfsclient/bootp_subr.c	2010-06-28 19:21:52.000000000 -0400
> @@ -1524,6 +1524,7 @@
>   			printf(" ");
>   			ifctx->gotgw = 1;
>   			gctx->gotgw = 1;
> +			nd->mygateway = ifctx->gw;
>   		}
>   	}


Yes. without BOOTPxxx options boot is fine.


I tryed your path with BOOTPxxx options, result panic.

Trying to mount root from nfs:
Panic: nfs_mountroot: RTM_ADD: 17
cpuid=1
Uptime 10s




> 
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-- 
alexs