[haiku-bugs] Re: [Haiku] #3999: Boot hangs at ohci ownership change when C1E is enabled

  • From: "yongcong" <trac@xxxxxxxxxxxx>
  • Date: Sun, 08 Apr 2012 03:27:59 -0000

#3999: Boot hangs at ohci ownership change when C1E is enabled
-------------------------+---------------------------
   Reporter:  meianoite  |      Owner:  mmlr
       Type:  bug        |     Status:  new
   Priority:  normal     |  Milestone:  R1
  Component:  Drivers    |    Version:  R1/pre-alpha1
 Resolution:             |   Keywords:
 Blocked By:             |   Blocking:  7478, 7665
Has a Patch:  0          |   Platform:  All
-------------------------+---------------------------

Comment (by yongcong):

 Dear all,

 would you please try the patch in #8111. I think the patch may fix the
 problem.

 > I hit the power button instead of the reset one. And the boot
 continued!!
 Because the CPUs are waken up once the power button hit ;)

 Dear meianoite,

 AMD C1E is different with intel C1E. AMD C1E is a BIOS controlled C3
 state. The difference between C1E and C3 is that transition into C1E is
 not initiated by the operating system. system will enter C1E state
 automatically when both cores enters C1 state.

 As for intel C1E, it means "reduce CPU voltage before entering
 corresponding Cx-state"

-- 
Ticket URL: <http://dev.haiku-os.org/ticket/3999#comment:15>
Haiku <http://dev.haiku-os.org>
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