Re: Does ICH9M support eSATA Port Multiplier?

[Robert Hancock <hancockrwd@gmail.com>]

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..