Re: diskless

On Fri, Feb 19, 2010 at 11:56:12PM -0500, Hugo Villeneuve wrote:
> On Fri, Feb 19, 2010 at 03:38:10PM +0000, Miod Vallat wrote:
> > > 
> > > A kernel with "config bsd root on nfs" crash into ddb with an MMU
> > > fault. But if I tell the booter to ask for root and write my network
> > > interface name at the prompt, it boots diskless properly.
> > 
> > Sounds like a NULL pointer dereference in setroot().
> > 
> > Does the following diff help? You should get greeted by a panic instead,
> > as there is no way for the kernel to guess which network interface to
> > use as its diskless interface, since it has not been booted from it.
> > 
> > If your machine only has one network interface it could be possible to
> > default to it, though.
> 
> The patch works great. 4.6-stable is a few version back from your
> (mvme68k?) tree but it applied cleanly.
> 
> For fairness, I'll try to get the result with a generic kernel
> (config bsd swap generic). It might panic on that. But that will
> be tomorrow. It takes 3+ hours to make a kernel.
> 

Obviously, there's no issue with GENERIC, the first thing setroot
does is add the RB_ASKNAME flag when there's no "root on" and no
boot device known.

Since then, I compiled 2 snapshots in a row. Seems to work all
right. I'm running March 3 and now making build xenocara. It's fun.

I tought a big issue was responsible for no new mac68k snapshots
since 4.6. But it seems it could run on auto-pilot for a few more
release. It was really easy for me to go to current.

<rant>
I guess "progress" means xterm terminfo entry is getting colors on
OpenBSD too. I just hate terminal colors. I had before a "screen-m"
entry that remove ansi colors from "screen" in my ~/.terminfo.db,
but now I have to also move all my xterm/Terminal.app to use "vt102"
instead of "xterm" for TERM. 
</rant>


Thanks again



Diff from GENERIC:

maxusers	64
option		BUFCACHEPERCENT=23
config		bsd	root on nfs swap on nfs


OpenBSD 4.7-beta (ROOTNFS) #4: Thu Mar  4 07:02:12 EST 2010
    [email protected]:/usr/src/sys/arch/mac68k/compile/ROOTNFS
Apple Macintosh Quadra 650, 68040 CPU+MMU+FPU, 4k on-chip physical I/D caches
real mem = 142606336 (136MB)
avail mem = 133488640 (127MB)
mainbus0 at root
obio0 at mainbus0
adb0 at obio0: II series
asc0 at obio0: Apple Sound Chip
macfb0 at obio0: DAFB, monitor sense 0
macfb0: 800x600, monochrome display
wsdisplay0 at macfb0 mux 1: console (std, vt100 emulation)
sn0 at obio0: integrated ethernet adapter, address 08:00:07:9c:f8:76
esp0 at obio0 (pseudo-DMA): NCR53C96, 16MHz
scsibus0 at esp0: 8 targets, initiator 7
sd0 at scsibus0 targ 2 lun 0: <IBM, DPES-31080 !t, S31R> SCSI2 0/direct fixed
sd0: 1034MB, 512 bytes/sec, 2118144 sec total
cd0 at scsibus0 targ 3 lun 0: <SONY, CD-ROM CDU-8003A, 1.9a> SCSI2 5/cdrom removable
zsc0 at obio0
zstty0 at zsc0 channel 0
zstty1 at zsc0 channel 1
nubus0 at mainbus0
adb0: 2 targets
akbd0 at adb0 addr 2: extended keyboard (ISO layout)
wskbd0 at akbd0: console keyboard, using wsdisplay0
ams0 at adb0 addr 3: 1-button, 100 dpi mouse
wsmouse0 at ams0 mux 0
vscsi0 at root
scsibus1 at vscsi0: 256 targets
softraid0 at root
can't figure root, hope your kernel is right
nfs_boot: using interface sn0, with revarp & bootparams
nfs_boot: client_addr=192.168.12.50
nfs_boot: server_addr=192.168.12.220 hostname=mac
root on jwales:/exports/mac/root
swap on jwales:/exports/mac/swap