Hi.
I need to boot on Sun Blade 150 from scsi-disk, that ran on old Sun Ultra 10.
It is necessary to take some the information from an old disk and something to study.
The workstation is booted and I receive the following issue:

Sun Blade 150 (UltraSPARC-IIe 650MHz), No Keyboard (tip connection)
Copyright 2005 Sun Microsystems, Inc. All rights reserved.
OpenBoot 4.17.1, 512 MB memory installed, Serial #xxxxxxxx.
Ethernet address xxxxxxxx, Host ID:xxxxxxxx



Rebooting with command: boot newdisk
Boot device: /pci@1f,0/pci@5/scsi@2/disk@0,0:a File and args:
boot: cannot open kernel/unix
Enter filename [kernel/unix]:
boot: cannot open kernel/unix
Enter filename [kernel/unix]:
boot: cannot open kernel/unix
Enter filename [kernel/unix]: /platform/sun4u/sparcv9/unix/kernel
boot: cannot open /platform/sun4u/sparcv9/unix/kernel
Enter filename [kernel/unix]:
Enter default directory for modules [/platfo
rm/sun4u/kernel /kernel /usr/kernel]:
krtld: error during initial load/link phase
ERROR: Last Trap: Fast Data Access MMU Miss

Error -256
Evaluating:
Tried to access instance-specific data with no current instance
ERROR: Last Trap: Fast Instruction Access MMU Miss

Evaluating:
Error -256
Stack Underflow
ok

at the ok> prompt type devalias. check for the device path for disk or disk0.
then issue ok> boot disk or <path>. before doing so, change the boot-device param at the OBP

ok
ok show-disks
a) /pci@1f,0/pci@5/scsi@2,1/disk
b) /pci@1f,0/pci@5/scsi@2/disk
c) /pci@1f,0/ide@d/cdrom
d) /pci@1f,0/ide@d/disk
q) NO SELECTION
Enter Selection, q to quit: a
/pci@1f,0/pci@5/scsi@2,1/disk has been selected.
Type ^Y ( Control-Y ) to insert it in the command line.
e.g. ok nvalias mydev ^Y
for creating devalias mydev for /pci@1f,0/pci@5/scsi@2,1/disk
ok nvalias newscsidisk(a) /pci@1f,0/pci@5/scsi@2,1/disk@0,0
ok boot newscsidisk(a)
Resetting ...



Sun Blade 150 (UltraSPARC-IIe 650MHz), No Keyboard
Copyright 2005 Sun Microsystems, Inc. All rights reserved.
OpenBoot 4.17.1, 512 MB memory installed, Serial #xxxxxxxx.
Ethernet address xxxxxxxx, Host ID: xxxxxxxx.

Rebooting with command: boot newscsidisk(a)
Boot device: /pci@1f,0/pci@5/scsi@2,1/disk@0,0 File and args:
Evaluating:

Can't open boot device

ok show-disks
a) /pci@1f,0/pci@5/scsi@2,1/disk
b) /pci@1f,0/pci@5/scsi@2/disk
c) /pci@1f,0/ide@d/cdrom
d) /pci@1f,0/ide@d/disk
q) NO SELECTION
Enter Selection, q to quit: b
/pci@1f,0/pci@5/scsi@2/disk has been selected.
Type ^Y ( Control-Y ) to insert it in the command line.
e.g. ok nvalias mydev ^Y
for creating devalias mydev for /pci@1f,0/pci@5/scsi@2/disk
ok nvalias newscsidisk(b) /pci@1f,0/pci@5/scsi@2/disk@0,0
ok boot newscsidisk(b)
Boot device: /pci@1f,0/pci@5/scsi@2/disk@0,0 File and args:
boot: cannot open kernel/unix
Enter filename [kernel/unix]:
boot: cannot open kernel/unix
Enter filename [kernel/unix]: /platform/sun4u/kernel/
boot: cannot open /platform/sun4u/kernel/
Enter filename [kernel/unix]:
Enter default directory for modules [/platform/sun4u/kernel /kernel /usr/kernel]:
krtld: error during initial load/link phase
ERROR: Last Trap: Fast Data Access MMU Miss

Evaluating:
Error -256
ERROR: Last Trap: Fast Data Access MMU Miss

Evaluating:
Error -256
ok

Boot the system from cdrom to single user. backup the data in the filesystem. then fsck the filesystems (until no more errors seen), remember to installboot bootblk on slice0 and try again.
btw no need to create alias at this state. just do a boot normally. if successful, then do it later. don't confuse or put "alot of things" by creating aliases when you're troubleshooting