[Bug 235944] jedec_dimm(4) does not attach to KFA2 (aka Galax) Hall of Fame DDR4 sticks

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235944

Ravi Pokala <rpokala at panasas.com> changed:

           What    |Removed                     |Added
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                 CC|                            |rpokala at panasas.com

--- Comment #3 from Ravi Pokala <rpokala at panasas.com> ---
> (interestingly, Thaiphoon Burner on Windows finds different SMBus addresses 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 bit
cleared. Thus, 7-bit addresses 0x52 and 0x53 become 8-bit addresses 0xa4 and
0xa6.

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