Date: Fri, 24 Dec 1999 17:47:08 +0100 From: Wilko Bulte <wilko@yedi.iaf.nl> To: Mike Smith <msmith@freebsd.org> Cc: FreeBSD-alpha mailing list <freebsd-alpha@freebsd.org> Subject: Re: diskless boot on Alpha Message-ID: <19991224174708.A63398@yedi.iaf.nl> In-Reply-To: <199912240210.SAA06908@mass.cdrom.com>; from msmith@freebsd.org on Thu, Dec 23, 1999 at 06:10:56PM -0800 References: <19991223220432.A11438@yedi.iaf.nl> <199912240210.SAA06908@mass.cdrom.com>
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On Thu, Dec 23, 1999 at 06:10:56PM -0800, Mike Smith wrote:
Hello Mike,
I appreciate your help in this. Be warned: long mail follows..
> > I'm probably overlooking something too obvious. As can be seen
> > below the Alpha (DEC3000/400 Sandpiper) tries to mount its root
> > device using ufs. Does not work too well with an nfs root.
> >
> > Previously there was a 'root on <bla> clause in the kernel config file.
> > But this is depreciated (right?).
> >
> > Question remains: how do I convince the kernel to use the nfs root?
>
> Are you booting the loader, or the kernel directly?
I'm doing:
>>> boot ez0
INIT-S-CPU...
AUDIT_BOOT_STARTS ...
AUDIT_BOOT_REQ
Host server IP address is 192.168.200.22
AUDIT_BSERVER_FOUND
AUDIT_LOAD_BEGINS
AUDIT_LOAD_DONE
Console: SRM firmware console
VMS PAL rev: 0x100010538
OSF PAL rev: 0x2012d
Switch to OSF PAL code succeeded.
FreeBSD/alpha SRM net boot, Revision 0.1
(root@miata.iaf.nl, Tue Dec 21 18:31:30 CET 1999)
Memory: 98304 k
boot: ethernet address: 08:00:2b:3c:61:45
net_open: server addr: 192.168.200.22
net_open: server path: /usr/sandpiper
Hit [Enter] to boot immediately, or any other key for command prompt.
Booting [kernel]...
/kernel data=0x189908+0x1b168 syms=[0x8+0x237c0+0x8+0x1a681]
Entering kernel at 0xfffffc000031f760...
> Try booting with '-a' and specify nfs:...
> I'd be guessing that the code in the alpha autoconf isn't correctly
> picking up that / is meant to be nfs-mounted. 8(
The relevant code (I think) is:
* Do legacy root filesystem discovery. This isn't really
* needed on the Alpha, which has always used the loader.
*/
void
cpu_rootconf()
{
int order = 0;
printf(">>## in cpu_rootconf\n");
/* #if defined(NFS) && defined(NFS_ROOT)
#if !defined(BOOTP_NFSROOT)
if (nfs_diskless_valid)
#endif
*/
rootdevnames[order++] = "nfs:";
printf (">>## nfsroot before ufs\n");
/* #endif */
#if defined(FFS) && defined(FFS_ROOT)
rootdevnames[order++] = "ufs:da0a";
#endif
}
SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, cpu_rootconf, NULL)
from autoconf.c (the printfs etc are mine)
First interesting observation is that 'options NFS' and 'options NFS_ROOT'
in the kernel config file do not result in the nfs bit being compiled in:
(using original autoconf.c):
miata#make
cc -c -O -pipe -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual
-fformat-extensions -ansi -nostdinc -I- -I. -I../.. -I../../../include
-DKERNEL -include opt_global.h -D_KERNEL -mno-fp-regs -Wa,-mev56
../../alpha/alpha/autoconf.c
../../alpha/alpha/autoconf.c: In function `cpu_rootconf':
../../alpha/alpha/autoconf.c:214: warning: unused variable `order'
In other words, the compiler only sees the declaration of 'order' and
no code that uses it.
I admit not to understand why this is the case. My theory right now is
that the compile of autoconf.c should include opt_nfs.h in addition to
opt_nfsroot.h. The latter is already present.
I base this on:
miata#grep NFS *
config.c:___options NFS #Network Filesystem\n\
config.c:___options NFS_ROOT #NFS usable as root device\n\
Binary file kernel matches
kernfs.h:#define NKERNFS 0
Binary file nfs_bio.o matches
Binary file nfs_node.o matches
Binary file nfs_nqlease.o matches
Binary file nfs_socket.o matches
Binary file nfs_srvcache.o matches
Binary file nfs_subs.o matches
Binary file nfs_syscalls.o matches
Binary file nfs_vfsops.o matches
Binary file nfs_vnops.o matches
opt_nfs.h:#define NFS 1
opt_nfsroot.h:#define NFS_ROOT 1
Binary file ufs_vnops.o matches
miata#pwd
/sys/compile/SAND
miata#
When I add opt_nfs.h to the include files in autoconf.c thing compile like
expected. Can somebody please verify this for me?
When I boot a kernel built with the above patch I get:
>>## nfsroot before ufs
Mounting root from ufs:192.168.200.22:/usr/sandpiper
Can't allocate root mount for filesystem 'ufs': 19
Root mount failed: 19
Manual root filesystem specification:
<fstype>:<device> Mount <device> using filesystem <fstype>
eg. ufs:/dev/da0s1a
? List valid disk boot devices
<empty line> Abort manual input
Which I don't understand because vfs_mountroot() should try nfs before
ufs because that is the order in which cpu_rootconf sets up the
rootdevnames ? And in my case the kernel is compiled without
FFS and FFS_ROOT so it should only do NFS.
I'm puzzled..
NB as the code tells me to use 'loader', how do I set
that up on Alpha? I still need to bootp netboot right?
Wilko Bulte Arnhem, The Netherlands - The FreeBSD Project
WWW : http://www.tcja.nl http://www.freebsd.org
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