installer cannot find SAS SCSI CD-ROM

Hello,

the debian installer fails to find the CD-ROM (and thus to mount it) on a system having a 'Fusion MPT SAS Host' controller with a SCSI CD-ROM.

The linux kernel module needed for the debian installer to detect and mount the CD-ROM is 'mptsas', which apparently is not included in the linux image at boot time.

Here is a workaround hack of how to get the installer to "work" :

  Copy the scsi-* 'udeb' files to a usb key :

• mount the debian ISO :
  $ mount -o loop debian_image.iso /media/cdrom
  
• mount the USB key :
  $ mount /dev/sdb1 /media/usb1
  
• copy the scsi* udeb files :
  $ cp $(find /media/cdrom/ -name "*scsi*.udeb") /media/usb1/
  $ cd /media/usb1
  
• extract the scsi debian packages :
  $ for a in *.udeb;do dpkg -x $a;done
  
• create a .tar.gz archive :
  $ tar czf lib_scsi_sas.tar.gz lib
  
• unmount the usb key
  $ umount /media/usb1
  

  Boot with the Debian CD :

• switch to console 2 with Ctrl+Alt+F2 and then press enter
• mount the usb key :
  $ modprobe vfat
  $ mkdir /mnt/usb1
  $ mount /dev/sde1 /mnt/usb1
  $ cd /mnt/usb1/
  
• extract the SCSI and SAS modules :
  $ tar zxf lib_scsi_sas.tar.gz -C /
  
• update modules dependencies :
  $ depmod
  
• load the required module :
  $ modprobe mptsas
  
• verify that the cd-rom is recognised :
  $ dmesg | tail -n 30 | grep "CD-ROM"
  ... Uniform CD-ROM driver Revision: 3.20 sr 10:0:0:0: Attaches scsi CD-ROM sr0
• you can test by mounting the cdrom :
  $ mkdir /mnt/cdrom && mount /dev/sr0 /mnt/cdrom
  $ ls /mnt/cdrom/ && umount /mnt/cdrom
  
• unmount the usb stick :
  $ cd / && umount /mnt/usb1
  
• switch to console 1 (debian installer) with Ctrl+Alt+F1 and choose ("No", "No", "Continue") "Detect and mount CD" (from the main menu)

Best regards,

-- 
Alexandru Munteanu


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