21 Aug
2018
21 Aug
'18
1:10 p.m.
On Tuesday 21 August 2018 10:56:56 Felix Miata wrote:
Gene Heskett composed on 2018-08-21 09:08 (UTC-0400):
+100
Now the question of the day is how the hell do we fix it?
As I implied 24 hours ago in this thread, it doesn't need fixing.
Jessie came in between Wheezy and Stretch, a long time (two years?).
There are multiple workarounds for those who skipped over Jessie:
With all due respect, and thats quite a bit for you Felix, there is but
one Jessie install here that runs Linuxcnc, and its on a raspi so we're
downloading a sd image and the install is writing the card and plugging
it in. I tried the installer on x86 machines and failed quite a few
times on several different machines. The LCNC folks never did issue a
dvd image of jessie that ran LinuxCNC. Now they have an experimental
stretch amd64 image that I'm playing with now, but IMO that installer is
broken too, no way to shut the speech-dispatcher up short of turning off
the audio amp. Had there ever been a working amd64 or even a 32 bit x86
jessie dvd image I would probably be running it on 6 machines here. That
one jessie I have, running most of a ton of a 70 yo old Sheldon lathe
from an rpi-3b, is dead stable from local power outage to local power
outage. Too bad it never got a working installer for amd64.
Now that's a gotcha I did not know. How did it
come that this was
thought of beeing a good idea?
Yep. Exactly my thought when i spent 3-hours with a server refusing
to boot after migration to a new hdd (i used a stretch flash to
copy). Who the fuck toughs it was a good idea?!! Why not call it
ext5 or ext4a or whatever?!! 1-Format the installation target using Wheezy or
Jessie or old Knoppix
or old anything in advance of starting the installer. Formatting is an
/optional/ part of the installation process (as is partitioning).
BTDT, the installer can't bypass it anyway. It it can, how?
2-As Dan wrote, use EXT3 instead of EXT4 (EXT3 can be
converted to
EXT4 later if desired. AFAIK, the incompatible options will not
automatically be added on conversion.)
3-Format with the Stretch installer, but specify to omit the
incompatible EXT4 options. I don't which it/they are, but my guess is
the only one that is needed is "-O '^64bit'". All my Wheezys were
eliminated around the time its support termination was announced, so
no practical way here to test.
So theres no lifeboat left in the wild. :(
4-Use XFS instead of EXT4.
5-Use a newer and/or custom kernel in Wheezy.
http://ftp5.gwdg.de/pub/linux/debian/debian/pool/main/l/
I downloaded one of the amd64-4.18 kernels, but since this system is a 32
bit system, it likely won't install. One of the reasons I wanted to
update was to get into 64 bit, but LCNC up until about a year ago, was a
32 bit app only because the latency went to hell with 64 bits, the
context switch frame to service an interrupt was that much bigger.
But now nearly everyone including me has exported the realtime stuff to
fpga cards which in some simpler cases become sub $100 expenditures
instead of trying to pour all that data back and forth over an epp
parport, latency is somewhat less important than formerly. Now its a
balancing act between machine max speed and adequate control, usually in
1 millisecond windows.
Thanks Felix.
--
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>