curious bootup warning/error

[Trent Albright]

Please forgive me if I leave any important information out, I just
recently graduated from IDE and moved on to SCSI.... 

Software
========
os: redhat5.1
kernel: 2.0.35
modules: 2.0.35
scsi driver: Adaptec AIC7xxx driver version: 5.0.19/3.2.4

Hardware
========
Dell Poweredge 4300, dual P2 333
AIC-7880 Ultra SCSI -wide (builtin):  single hd attached 
AIC-7860 Ultra SCSI -narrow (builtin): single cd rom drive attached
AHA-2940 Ultra SCSI -wide (pci bus): empty
backplane: I don't know.....

So, on to the problem. Well, it's not really a problem yet, because
everything is running fine. However, the machine is a production server
so I need to be sure I understand what the following error message 
means and if I should even care. Note that this message never came up
under redhat5.1 with kernel and modules of version 2.0.34-2 on the same
machine:

scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.0.19/3.2.4
       <Adaptec AIC-7880 Ultra SCSI host adapter>
scsi1 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.0.19/3.2.4
       <Adaptec AIC-7860 Ultra SCSI host adapter>
scsi2 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.0.19/3.2.4
       <Adaptec AHA-294X Ultra SCSI host adapter>
scsi : 3 hosts.
(scsi0:0:-1:-1) Scanning channel for devices.
  Vendor: SEAGATE   Model: ST39102LC         Rev: 0004
  Type:   Direct-Access                      ANSI SCSI revision: 02
Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
(scsi1:0:-1:-1) Scanning channel for devices.
=>WHAT?=>(scsi0:-1:-1:-1) Bad scbptr 255 during SELTO.
=>WHAT?=>(scsi0:-1:-1:-1) Referenced SCB 255 not valid during SELTO.
        SCSISEQ = 0x12 SEQADDR = 0xa SSTAT0 = 0x10 SSTAT1 = 0x8a
  Vendor: NEC       Model: CD-ROM DRIVE:464  Rev: 1.05
  Type:   CD-ROM                             ANSI SCSI revision: 02
Detected scsi CD-ROM sr0 at scsi1, channel 0, id 5, lun 0
(scsi2:0:-1:-1) Scanning channel for devices.
(scsi0:0:0:0) Using wide (16 bit) transfers.
(scsi0:0:0:0) Synchronous at 20.0MHz, offset 8.
SCSI device sda: hdwr sector= 512 bytes. Sectors= 17783240 [8683 MB] [8.7 GB]
 sda: sda1 sda2 < sda5 sda6 sda7 sda8 sda9 >
VFS: Mounted root (ext2 filesystem) readonly.
Trying to unmount old root ... okay
=>WHAT?=>(scsi2:-1:-1:-1) Bad scbptr 255 during SELTO.
=>WHAT?=>(scsi2:-1:-1:-1) Referenced SCB 255 not valid during SELTO.
        SCSISEQ = 0x12 SEQADDR = 0xa SSTAT0 = 0x15 SSTAT1 = 0x88


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