Hello,

The latest Debian SID kernel (vmlinux-6.4.0-1-sparc64) fails on a Sun
Ultra 30 with the following error at the PROM:

-----
...
Loaded kernel version 6.4.4
Loading initial ramdisk (23022746 bytes at 0x64000000 phys, 0x40C00000
virt)...
Fast Data Access MMU Miss
ok
-----

I have been running a custom 6.2.10 kernel, and that continues to work.
I'm not sure whether this is related to Joacim Nilsson's cgroup fail
error on his Sun Ultra 5, but the failure message is different. I'll
have to investigate whether this could be a kernel regression.

The previous Debian SID kernel that I have is vmlinux-6.1.0-7-sparc64,
and it also results in the "Fast Data Access MMU Miss" error.

An earlier kernel (vmlinux-5.16.0-6-sparc64) works as expected:

# uname -a
Linux ultra-30 5.16.0-6-sparc64 #1 Debian 5.16.18-1 (2022-03-29) sparc64
GNU/Linux

# cat /proc/cpuinfo
cpu             : TI UltraSparc II  (BlackBird)
fpu             : UltraSparc II integrated FPU
pmu             : ultra12
prom            : OBP 3.9.5 1997/04/11 10:03
type            : sun4u
ncpus probed    : 1
ncpus active    : 1
D$ parity tl1   : 0
I$ parity tl1   : 0
Cpu0ClkTck      : 0000000011a4783f
cpucaps         : flush,stbar,swap,muldiv,v9,mul32,div32,v8plus,vis
MMU Type        : Spitfire
MMU PGSZs       : 8K,64K,512K,4MB

root@ultra-30:~# cat /proc/swaps
Filename    Type        Size       Used     Priority
/dev/sda2   partition   1052248    0        -2

# fdisk -l
Disk /dev/sda: 136.73 GiB, 146815737856 bytes, 286749488 sectors
Disk model: ST3146807LC
Geometry: 255 heads, 63 sectors/track, 17849 cylinders
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: sun

Device         Start       End   Sectors   Size Id Type         Flags
/dev/sda1          0   1060289   1060290 517.7M  1 Boot
/dev/sda2    1060290   3164804   2104515     1G 82 Linux swap
/dev/sda3          0 286744184 286744185 136.7G  5 Whole disk
/dev/sda4    3164805  19936664  16771860     8G 83 Linux native
/dev/sda5   19936665  53496449  33559785    16G 83 Linux native
/dev/sda6   53496450  87056234  33559785    16G 83 Linux native
/dev/sda7   87056235 103828094  16771860     8G 83 Linux native
/dev/sda8  103828095 286744184 182916090  87.2G 83 Linux native

-Stan

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