Date: Tue, 29 Jun 2010 18:00:40 +0200 From: "C. P. Ghost" <cpghost@cordula.ws> To: Matthew Seaman <m.seaman@infracaninophile.co.uk> Cc: zaxis <z_axis@163.com>, freebsd-questions@freebsd.org Subject: Re: How to get the SPD infomation in freebsd ? Message-ID: <AANLkTilAiBfm9uqroTGIIvvq5JM_xpoLUOyizGyBBXYo@mail.gmail.com> In-Reply-To: <4C2989EB.6010500@infracaninophile.co.uk> References: <29015060.post@talk.nabble.com> <4C2989EB.6010500@infracaninophile.co.uk>
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On Tue, Jun 29, 2010 at 7:51 AM, Matthew Seaman
<m.seaman@infracaninophile.co.uk> wrote:
> On 29/06/2010 03:29:04, zaxis wrote:
>>
>> In windows, the `CPU-Z` utility can be used to get the SPD(Serial Presen=
ce
>> Detect) information. How about freebsd ? I want to get those information
>> especially frequency to add more memory. And i donot want to touch the
>> hardware.
>
> Try dmidecode(8) -- it's in ports. =A0This will tell you quite a bit of
> information about what type of RAM you have installed, but it may be
> more productive to look up the Motherboard model numbers it returns, and
> find compatible RAM that way.
dmidecode(8) is better than nothing, but it doesn't return SPD data for me:
Handle 0x002B, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0029
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 72 bits
Size: 2048 MB
Form Factor: DIMM
Set: None
Locator: DIMM0
Bank Locator: BANK0
Type: DDR2
Type Detail: Synchronous
Speed: 400 MHz
Manufacturer: Manufacturer0
Serial Number: SerNum0
Asset Tag: AssetTagNum0
Part Number: PartNum0
(Maybe those DIMMS aren't SPD capable? I don't know).
According to
http://en.wikipedia.org/wiki/Serial_presence_detect
dmidecode(8) reads only BIOS data, but not the eeprom from
the DRAM modules themselves. The same page also points
to spdmem(4).
OpenBSD's spdmem(4) driver could be interesting to port to FreeBSD:
http://www.openbsd.org/cgi-bin/man.cgi?query=3Dspdmem&sektion=3D4
as it allegedly reads the eeprom data directly off the DIMM modules.
> Even so, for best results it helps if you install a uniform set of RAM
> modules, and I don't think there's any option other than popping the
> case and pulling a RAM stick for a visual inspection if you want a 100%
> certain match.
I've already seen mislabled DIMMS in the past, and usually, the
information stored in SPD was more reliable than the one on the
stickers (but not always).
> =A0 =A0 =A0 =A0Cheers,
>
> =A0 =A0 =A0 =A0Matthew
-cpghost.
--=20
Cordula's Web. http://www.cordula.ws/
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