Modern 13 has early-fail boot for 2-socket/1-core-each PowerMac7,2 G5; r365932 boots it fine; artifact.ci r368820 hangs later

I attempted moving the media I use with the 2-socket/2-cores-each
G5 into the 2-socket/1-cores-each G5 that I have access to. It
silently hangs up almost immediately after the loader's timeout
prompt is "returned to" (or finishes the timeout). This happened
for both vt and sc for kern.vty .

An older system that still boots (with an oddity) with is as
follows, also showing some about the type of machine:

FreeBSD 13.0-CURRENT #18 r365932M: Tue Sep 22 13:46:46 PDT 2020
    root@FBSDFHUGE:/usr/obj/powerpc64vtsc_clang/powerpc.powerpc64/usr/src/powerpc.powerpc64/sys/GENERIC64vtsc-NODBG powerpc
FreeBSD clang version 11.0.0 ([email protected]:llvm/llvm-project.git llvmorg-11.0.0-rc2-91-g6e042866c30)
VT(ofwfb): resolution 1680x1050
cpu0: IBM PowerPC 970 revision 2.2, 2000.20 MHz
cpu0: Features dc000000<PPC32,PPC64,ALTIVEC,FPU,MMU>
cpu0: HID0 511081<NAP,DPM,NHR,TBEN,ENATTN>

  model:
    50 6f 77 65 72 4d 61 63 37 2c 32 00 
    'PowerMac7,2'

      cpu-version:
        00 39 02 02 

      model:
        41 70 70 6c 65 20 50 6f 77 65 72 4d 61 63 37 2c 32 20 35 2e 
        31 2e 34 66 30 20 42 6f 6f 74 52 4f 4d 20 62 75 69 6c 74 20 
        6f 6e 20 31 31 2f 32 31 2f 30 33 20 61 74 20 31 37 3a 34 31 
        3a 34 38 00 
        'Apple PowerMac7,2 5.1.4f0 BootROM built on 11/21/03 at 17:41'
        ':48'
      BootROM-version:
        24 30 30 30 35 2e 31 34 66 30 00 
        '$0005.14f0'
      BootROM-build-date:
        31 31 2f 32 31 2f 30 33 20 61 74 20 31 37 3a 34 31 3a 34 38 
        00 
        '11/21/03 at 17:41:48'

# uname -apKU
FreeBSD FBSDG5L2 13.0-CURRENT FreeBSD 13.0-CURRENT #18 r365932M: Tue Sep 22 13:46:46 PDT 2020     root@FBSDFHUGE:/usr/obj/powerpc64vtsc_clang/powerpc.powerpc64/usr/src/powerpc.powerpc64/sys/GENERIC64vtsc-NODBG  powerpc powerpc64 1300115 1300115

The above has my normal patches involved and is a non-debug
build.

The oddity in this boot is that the following sequence
happens each time:

. . .
ada0 at ata2 bus 0 scbus2 target 0 lun 0
ada0: <OWC Mercury Electra 3G SSD 541ABBF0> ATA8-ACS SATA 2.x device
ada0: Serial Number **REPLACED**
ada0: 150.000MB/s transfers (SATA 1.x, UDMA5, PIO 512bytes)
ada0: 457862MB (937703088 512 byte sectors)
cd0 at ata0 bus 0 scbus0 target 0 lun 0
cd0: <PIONEER DVD-RW  DVR-111D 1.23> Removable CD-ROM SCSI device
cd0: Serial Number **REPLACED**
cd0: 66.700MB/s transfers (UDMA4, ATAPI 12bytes, PIO 65534bytes)
cd0: Attempt to query device size failed: NOT READY, Medium not present
Mounting from ufs:/dev/ufs/FBSDG5L2rootfs failed with error 2; retrying for 10 more seconds
Mounting from ufs:/dev/ufs/FBSDG5L2rootfs failed with error 2.

Loader variables:
  vfs.root.mountfrom=ufs:/dev/ufs/FBSDG5L2rootfs
  vfs.root.mountfrom.options=rw,noatime

Manual root filesystem specification:
  <fstype>:<device> [options]
      Mount <device> using filesystem <fstype>
      and with the specified (optional) option list.

    eg. ufs:/dev/da0s1a
        zfs:zroot/ROOT/default
        cd9660:/dev/cd0 ro
          (which is equivalent to: mount -t cd9660 -o ro /dev/cd0 /)

  ?               List valid disk boot devices
  .               Yield 1 second (for background tasks)
  <empty line>    Abort manual input

mountroot> 
List of GEOM managed disk devices:
  label/FBSDG5LBswap ufs/FBSDG5LBrootfs cd0 ada0s4 ada0s3 ada0s2 ada0

mountroot> Trying to mount root from ufs:/dev/ufs/FBSDG5LBrootfs []...
lo0: link state changed to UP
gem0: link state changed to DOWN
gem0: link state changed to UP
. . .

(Despite what is shown, I did type "ufs:/dev/ufs/FBSDG5LBrootfs".)


The early-fail media is based on main's 19cca0b9613d (but with my patches
involved):

# ~/fbsd-based-on-what-freebsd-main.sh mm-src
19cca0b9613d7c3058e41baf0204245119732235
CommitDate: 2021-01-09 16:21:33 -0800
5d333ee67ac3 19cca0b9613d (HEAD -> mm-src) mm-src snapshot for mm's patched build in git context.
FreeBSD FBSDG5L2 13.0-CURRENT FreeBSD 13.0-CURRENT mm-src-c255807-g5d333ee67ac3 GENERIC64vtsc-NODBG  powerpc powerpc64 1300134 1300134

This media boots the 2-socket/2-cores-each G5 just fine.


I tried the artifacts.ci.freebsd.org r368820 powerpc64 debug 
kernel with the r365932 world and it does not have the same
early-fail problem, but it hangs later, after (last message):

cryptosoft0: <software crypto> on nexus0


Unfortunately, git's main still has no artifact materials after
r368820 so there are no official/ready-made materials to
approximately bisect with in order to identify when the early-fail
started.

r368820 did not have distinctions based on vt vs. sc. So it
looks like I was just out of date for the status of that on
the PowerMac7,2 system, not having tested it in so long: it
got far beyond where it used to stop.

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

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