Re: kern/46828 6.0_BETA2 and 6.0_RC1 won't start on DL320/G5p

[David Laight <david%l8s.co.uk@localhost>]

The following reply was made to PR kern/46828; it has been noted by GNATS.

From: David Laight <david%l8s.co.uk@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/46828 6.0_BETA2 and 6.0_RC1 won't start on DL320/G5p
Date: Sat, 22 Sep 2012 10:18:32 +0100

 On Sat, Sep 22, 2012 at 08:45:03AM +0000, Ryo ONODERA wrote:
 ...
 >  According to Intel's "Enhanced Host Controller Interface Specification
 >  for Universal Serial Bus",
 >  www.intel.com/technology/usb/download/ehci-r10.pdf .
 >  
 >  In p.131, 
 >  "One semaphore is for the operating system (OS) and one is for the
 >  BIOS. These semaphores are readable and writable. These fields are in
 >  adjacent bytes, which allows each agent (OS or BIOS) to update their
 >  respective semaphore without overwriting the other ownership semaphore."
 
 That description makes me think that the code should be doing byte
 writes.
 However I've a lurking feeling that not all systems support non-word
 config space writes.
 
        David
 
 -- 
 David Laight: david%l8s.co.uk@localhost