Intel(R) C600 SAS Controller Driver is boot essential

Some boot essential devices also need firmware.

This bug was fixed in the package linux-firmware - 1.74

---------------
linux-firmware (1.74) precise; urgency=low

  * Added isci/isci_firmware.bin to scsi-firmware.lst
    -LP: #963306
 -- Tim Gardner <email address hidden> Fri, 23 Mar 2012 11:47:09 -0600

This bug was fixed in the package linux - 3.2.0-21.34

---------------
linux (3.2.0-21.34) precise; urgency=low

  [ AceLan Kao ]

  * SAUCE: (drop after 3.4) asus-wmi: add scalar board brightness adj.
    support
    - LP: #961879
  * SAUCE: (drop after 3.4) asus-wmi: store backlight power status for AIO
    machine
    - LP: #961880

  [ Andy Whitcroft ]

  * [Config]: enable CONFIG_DRM_LOAD_EDID_FIRMWARE

  [ John Johansen ]

  * SAUCE: AppArmor: Add the ability to mediate mount
  * SAUCE: AppArmor: Add profile introspection file to interface
  * SAUCE: AppArmor: basic networking rules
  * SAUCE: Update aufs for build failure caused by apparmor backport
  * SAUCE: AppArmor: Fix change_onexec when called from a confined task
    - LP: #963756

  [ Leann Ogasawara ]

  * Revert "SAUCE: (drop after 3.3) platform/x86: Add driver for Apple gmux
    device"
  * Rebase to v3.2.13
  * d-i: Fix iwl3945 driver name typo in nic-modules
  * d-i: Add missing iwl* drivers to nic-modules
    - LP: #965116
  * d-i: Remove obsolete bcm43xx* drivers from nic-modules
  * d-i: Add brcm*mac drivers to nic-modules

  [ Seth Forshee ]

  * SAUCE: (drop after 3.3) apple_bl: Add register/unregister functions
  * SAUCE: (drop after 3.3) platform/x86: Add driver for Apple gmux device

  [ Tim Gardner ]

  * Add isci to debian scsi-modules udeb
    - LP: #963306
  * SAUCE: fsam7400: use UMH_WAIT_PROC consistently
    - LP: #963685
  * SAUCE: disable_nx should not be in __cpuinitdata section for X86_32
    - LP: #968233

  [ Upstream Kernel Changes ]

  * Bluetooth: Adding USB device 13d3:3375 as an Atheros AR3012.
    - LP: #916319
  * x86: Report cpb and eff_freq_ro flags correctly
    - LP: #960461
  * x86/amd: Add missing feature flag for fam15h models 10h-1fh processors
    - LP: #960461
  * KVM: Move cpuid code to new file
    - LP: #960466
  * KVM: expose latest Intel cpu new features (BMI1/BMI2/FMA/AVX2) to guest
    - LP: #960466
  * apparmor: add missing rcu_dereference()
  * apparmor: fix module parameter handling
  * btrfs, nfs, apparmor: don't pull mnt_namespace.h for no reason...
  * switch security_path_chmod() to umode_t
  * switch securityfs_create_file() to umode_t
  * switch ->path_mkdir() to umode_t
  * switch ->path_mknod() to umode_t
  * capabilities: remove the task from capable LSM hook entirely
  * switch security_path_chmod() to struct path *
  * AppArmor: refactor securityfs to use structures
  * AppArmor: add initial "features" directory to securityfs
  * AppArmor: add "file" details to securityfs
  * AppArmor: export known rlimit names/value mappings in securityfs
  * AppArmor: Add mising end of structure test to caps unpacking
  * AppArmor: Fix dropping of allowed operations that are force audited
  * AppArmor: Fix underflow in xindex calculation
  * AppArmor: fix mapping of META_READ to audit and quiet flags
  * AppArmor: Fix the error case for chroot relative path name lookup
  * AppArmor: Fix error returned when a path lookup is disconnected
  * AppArmor: Fix oops in policy unpack auditing
  * AppArmor: Add const qualifiers to generated string tables
  * AppArmor: Retrieve the dentry_path for error reporting when path lookup
    fails
...