Re: Does ICH9M support eSATA Port Multiplier?

[Peter Klotz <peter.klotz@aon.at>]

Robert Hancock wrote:
> On 10/30/2009 04:10 PM, Peter Klotz wrote:
>> Robert Hancock wrote:
>>>> Can I enable it somehow maybe by using a module option?
>>>
>>> No module parameter for that, you'd have to hack the code in ahci.c to
>>> force the option on. No guarantees it's going to work if the
>>> controller doesn't report the capability, though.
>>
>> Could you please give me a hint what to change in ahci.c?
>>
>> I would like to try and see what happens.
> 
> Based on the version in Linus' git, you'd likely want to add to 
> ahci_save_initial_config something like:
> 
> cap |= HOST_CAP_PMP;
> 
>>
>> Could such a hack damage the hardware?
> 
> Not likely. It's not impossible that data loss could result though, 
> better back up important files first..

Thanks a lot. I had already prepared the kernel, then I found the Intel 
datasheet, which states that ICH9 does not support port multipliers.

http://www.intel.com/assets/pdf/datasheet/316972.pdf

Regards, Peter.