I've tested with kernel from comment #56.

The kernel generated too much logs for IPMI serial console (which
generated too much garbage), so I switched to a real serial console (and
at 115kbauds).

I've attached a archive with 3 runs (the last run it the most
interesting I think):

First run with serial console and a bigger kernel log buffer (log_buf_len=8M).
The hope with larger log buffer was to catch full kernel message with dmesg 
once server is running.
Sadly, after about 30 minutes, server was still printing stacks.
Serial console capture attached under name "01-serial-capture-large-buffer.txt"


Second run, still with serial console but with default kernel log (no 
log_buf_len)
This time, kernel booted fine (with exception to disk beeing discovered after 
rootdelay, but a ctrl+d resumed the boot process).
Note: this boot generated WAY less message and booted. The only change is the 
log_buf_len=8M present or not.
Serial console capture attached under name 
"02-serial-capture-default-buffer.txt"


Third run, this time with serial console disabled and very large kernel log 
buffer (log_buf_len=32M).
Probably the most interesting one, dmesg was complete (include very first 
messages). It is 12 MB large !
Server booted without any issue (disk detected before the end of rootdelay).

** Attachment added: "Logs when running kernel from comment #56"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1276705/+attachment/4033864/+files/logs-3.14.0-031400rc7.201403191557.tar.xz

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https://bugs.launchpad.net/bugs/1276705

Title:
  Kernel 3.13 fail to boot with LSI SAS1068E (Dell SAS 6/iR)

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