can not boot from over a USB hub



Hi,

under solaris 10 5/08 ona sun4v system, i have that problem that i can't
boot from a usb mass storage device when there is a usb hub in the middle.
i have applied patch 138312-01:
http://sunsolve.sun.com/search/document.do?assetkey=138312

it says:
"...
Problem Description:
6563214 system panics on booting Solaris from USB hard/flash drive if
connected via USB hub..."

but after applying it i am still getting a panic. i have tried many
things, even trying to first boot from my local scsi disk (on which i
had applied the patch) then specifying the root directory of the usb
device i want to boot from....to no avail.

in all cases, it seems to be choking on the "hub" part of the pathname:

{0} ok
{0} ok boot -arv
Boot device: /pci@0/pci@0/pci@2/scsi@0/disk@0 File and args: -arv
Enter filename [kernel/sparcv9/unix]:
Enter default directory for modules [/platform/sun4v/kernel /kernel
/usr/kernel]:
module /platform/sun4v/kernel/sparcv9/unix: text at [0x1000000,
0x109e937] data at 0x1800000
module misc/sparcv9/krtld: text at [0x109e938, 0x10b8e57] data at 0x1894148
module /platform/sun4v/kernel/sparcv9/genunix: text at [0x10b8e58,
0x122a6b7] data at 0x189a0c0
module /platform/sun4v/kernel/misc/sparcv9/platmod: text at [0x122a6b8,
0x122a6cf] data at 0x18f0a70
module /platform/sun4v/kernel/cpu/sparcv9/SUNW,UltraSPARC-T2: text at
[0x122a6e0, 0x122f987] data at 0x18f1180
Name of system file [etc/system]:
SunOS Release 5.10 Version Generic_137111-04 64-bit
Copyright 1983-2008 Sun Microsystems, Inc. All rights reserved.
Use is subject to license terms.
Ethernet address = 0:80:b6:0:17:4
root filesystem type [ufs]:
Enter physical name of root device
[/pci@0/pci@0/pci@2/scsi@0/disk@0,0:a]:
/pci@0/pci@0/pci@1/pci@0/usb@0/hub@1/storage@1/disk@0,0:b
mem = 8257536K (0x1f8000000)
avail mem = 7989796864
root nexus = SPARC OEM T2BC
pseudo0 at root
pseudo0 is /pseudo
scsi_vhci0 at root
scsi_vhci0 is /scsi_vhci
px0 at root: 0x0 0x0
px0 is /pci@0
PCI Express-device: pci@0, pxb_plx0
pxb_plx0 is /pci@0/pci@0
PCI-device: pci@1, pxb_plx1
pxb_plx1 is /pci@0/pci@0/pci@1
PCI-device: pci@0, px_pci0
px_pci0 is /pci@0/pci@0/pci@1/pci@0
PCI-device: usb@0, ohci0
ohci0 is /pci@0/pci@0/pci@1/pci@0/usb@0
Cannot assemble drivers for root
/pci@0/pci@0/pci@1/pci@0/usb@0/hub@1/storage@1/disk@0,0:b
Cannot mount root on
/pci@0/pci@0/pci@1/pci@0/usb@0/hub@1/storage@1/disk@0,0:b fstype ufs

panic[cpu0]/thread=180e000: vfs_mountroot: cannot mount root

000000000180b950 genunix:vfs_mountroot+32c (800, 200, 0, 18a6400,
18d0000, 18f8c00)
%l0-3: 00000000010d2c00 00000000010d2a88 00000000018ac070 00000000011fbc00
%l4-7: 00000000011fbc00 00000000018fb000 0000000000000600 0000000000000200
000000000180ba10 genunix:main+a0 (182b578, 101a800, 1859390, 18f5400,
3001, 182b400)
%l0-3: 0000000070002000 0000000000000001 0000000070002000 000000000180c000
%l4-7: 000000000180e000 0000000070002000 000000000180c000 0000000000000000

skipping system dump - no dump device configured
rebooting...



any ideas?

thanks
-jfs
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