head -r345758: usefdt=1 style boot fails on PowerMac7,2 G5 (1 core per socket): Error -2 adding node /cpus/PowerpC,970 [G4 failures too, problem identified]

[Mark Millard]

[I produced a ofwdump -ap output from the old SSD
booting the PowerMac11,2 . It produces a (somewhat)
larger output than is produced under usefdt=1
style handling, suggesting mismatches or incompletenesses
for usefdt=1 .]

On 2019-Apr-7, at 16:31, Mark Millard <marklmi at yahoo.com> wrote:

> 
> On 2019-Apr-7, at 15:46, Mark Millard <marklmi at yahoo.com> wrote:
> 
>> . . .
> 
>> 
>> I'll see about diff'ing the good vs. bad PowerMac3,6
>> ofwdump -ap output when I have a chance.
>> 
> 
> The outputs are not such that a diff is all that useful,
> a extensively different output ordering appears to be 
> involved.
> 
> For reference:
> 
> # ls -lTd ~/ofwdump_*.txt
> -rw-r--r--  1 root  wheel  166008 Apr  7 16:21:33 2019 /root/ofwdump_11,2_usefdt1.txt
> -rw-r--r--  1 root  wheel   93713 Apr  7 13:11:21 2019 /root/ofwdump_3,6_bad.txt
> -rw-r--r--  1 root  wheel  162390 Apr  7 15:40:23 2019 /root/ofwdump_3,6_good.txt
> -rw-r--r--  1 root  wheel  818400 Apr  7 15:15:03 2019 /root/ofwdump_7,2_good.txt
> 
> ( *3,6_bad.txt was under usefdt=1 and based on far more modern head code than the
> matching *3,6_good.txt file was. *7,2_good.txt is from the old version of head as
> well. )
> 
> ofwdump_3,6_bad.txt seems to be missing a lot, based on the size difference vs.
> ofwdump_3,6_good.txt .

So, showing the older context's ofwdump -ap output file size as well:

# ls -lTd ~/ofwdump_*.txt
-rw-r--r--  1 root  wheel  192603 Apr  7 17:48:15 2019 /root/ofwdump_11,2_old.txt
-rw-r--r--  1 root  wheel  166008 Apr  7 16:21:33 2019 /root/ofwdump_11,2_usefdt1.txt
-rw-r--r--  1 root  wheel   93713 Apr  7 13:11:21 2019 /root/ofwdump_3,6_bad.txt
-rw-r--r--  1 root  wheel  162390 Apr  7 15:40:23 2019 /root/ofwdump_3,6_good.txt
-rw-r--r--  1 root  wheel  818400 Apr  7 15:15:03 2019 /root/ofwdump_7,2_good.txt

Again, the ordering differences and such make a diff
not all that useful.

I have no clue why ofwdump_7,2_good.txt is so much larger than all the
others.

It would be easier to compare old vs. usefdt=1 style if usefdt=1 style
managed to preserve the ordering of what ofwdump -ap outputs for old, there
by allowing vastly fewer differences (despite magic node number differences
and such). I've no clue how to validate the usefdt=1 style as things are.

I do not ever have access to other types of G5's. I do sometimes have
access to some single-socket/single-processor/single-core G4s and one
G3. But I'm not intending to do any exploring for these for now.

Let me know if you want a bugzilla submittal with the ofwdump_*,*.txt files
as attachments.

===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)