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Date:      Fri, 22 Feb 2019 23:21:24 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 235944] jedec_dimm(4) does not attach to KFA2 (aka Galax) Hall of Fame DDR4 sticks
Message-ID:  <bug-235944-227-Yy8tLfAGau@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-235944-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-235944-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D235944

Ravi Pokala <rpokala@panasas.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rpokala@panasas.com

--- Comment #3 from Ravi Pokala <rpokala@panasas.com> ---
> (interestingly, Thaiphoon Burner on Windows finds different SMBus address=
es for the SPD EEPROMs: 0x52 and 0x53)

SMBus uses the low-order bit to denote read or write. It looks like Windows
uses 7-bit addressing, where the read/write bit is simply omitted. FreeBSD =
uses
8-bit SMBus addresses, which are always passed around with the read/write b=
it
cleared. Thus, 7-bit addresses 0x52 and 0x53 become 8-bit addresses 0xa4 and
0xa6.

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