Re: [PATCH V2] MIPS: Octeon: Register EEPROM device on the I2C bus

[Jean Delvare <khali@linux-fr.org>]

Hi Ralf,

On Tue, 16 Mar 2010 19:09:46 +0100, Ralf Baechle wrote:
> On Mon, Mar 08, 2010 at 01:29:50PM +0800, Yang Shi wrote:
> 
> > An SPD resides on 0x50 of the I2C bus on CN56xx/57xx board,
> > register this device.
> 
> I wonder what the use case for this patch is?  Normally Linux doesn't care
> about SPD.

The Linux kernel doesn't care, but user-space may. As a matter of fact,
there is a script out there (decode-dimms, in the i2c-tools package)
decoding the SPD data and presenting it to the user. Some people want
to know the details about their memory modules.

> I also wonder how this will work for configurations with multiple memory
> modules thus multiple SPD EEPROMS.

The kernel code should instantiate one spd device per memory module
(assuming they are all reachable.) Obviously this can't be done in a
static way.

-- 
Jean Delvare