Conference mr1pst::sco_unix

2567.0. "Errors with DAC960 and imbedded SCSI adapter" by CSCMA::EARNEST () Thu Apr 03 1997 17:10

Mylex Corporation : Tech note # 28                          April 18,1996
Application notes : SCO Open Server V and DAC960 drivers version 4.00, 
		    4.01, 4.03
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Problem installing SCO-V with built-in SCSI and system with multiple PCI BUS:

If you are installing the DAC960 on a system with an imbedded Host Bus 
Adapter, such as an Adaptec, the BIOS information of that Adapter may 
remain visible to the SCO OpenServer Installation Program.  This can happen 
on some motherboards even though you think that you have disabled the BIOS.   

Also on systems with more than 1 PCI bus, SCO something has problem detecting 
DAC960 installed on the 2nd PCI BUS.

The result of above problems is that SCO will not able to detect DAC960 
correctly. During the installation process, after you have typed 
"ahslink mdac" as instructed, SCO will report :

warning : no root disk controller
warning : no root disk device

To bypass this problem, the user needs to enter a bootstring instead of  
the default  "ahslink mdac" for SCO V to specify the installation is on 
the DAC960.

Procedure :
At the boot prompt, enter :

restart ahslink=mdac Sdsk=mdac(0,X,0,1)       
where X is the number of the PCI bus in the case of PCI ( 0 for 1st PCI bus)

following is the meaning of the above bootstring ( page 238-239 on SCO 
Openserver handbook )

periph=adapter(hanum,bus,id,lun)
Periph          Sdsk  = SCSI hard disk
adapter         mdac - Mylex host adapter drivers prefix
hanum           host adapter number ( from 0-7), 0 for 1st Mylex controller
bus             number of SCSI or PCI bus on adapter, usually 0 on DAC960
id              SCSI ID. for DAC960 - use 0 for 1st system drive. 
lun             use Lun number 1 for hard disk on Mylex DAC960