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Darkn3xx

Member

Registered: 2011-10-03

Posts: 2

[SOLVED] Enabling AHCI with nVidia MCP79 (MacBook Alu 2008)

Hi there !

I am trying to activate AHCI on my Mac in order to use TRIM for my SSD (Crucial M4 128 Go).
According to this wiki: SSD (Section: Special considerations for Mac computers)

I need to add to my grub.cfg :

setpci -d 10de:0ab5 90.b=40

Unfortunately, I found out it only works with Intel's SATA Controller. I think the problem is the 90.b=40 part.

Does anyone know how to get this working with MCP79 ?

lspci -nn | grep SATA
00:0b.0 IDE interface [0101]: nVidia Corporation MCP79 SATA Controller [10de:0ab5] (rev b1)

dmesg | grep ahci
[    1.108925] ahci 0000:00:0b.0: version 3.0
[    1.109121] ahci 0000:00:0b.0: PCI INT A -> Link[LSI0] -> GSI 18 (level, low) -> IRQ 18
[    1.109175] ahci 0000:00:0b.0: irq 41 for MSI/MSI-X
[    1.109183] ahci 0000:00:0b.0: controller can't do PMP, turning off CAP_PMP
[    1.109244] ahci 0000:00:0b.0: AHCI 0001.0200 32 slots 6 ports 3 Gbps 0x3 impl IDE mode
[    1.109249] ahci 0000:00:0b.0: flags: 64bit ncq sntf pm led pio slum part boh 
[    1.109254] ahci 0000:00:0b.0: setting latency timer to 64
[    1.110097] scsi0 : ahci
[    1.110891] scsi1 : ahci
[    1.111025] scsi2 : ahci
[    1.111158] scsi3 : ahci
[    1.111267] scsi4 : ahci
[    1.111469] scsi5 : ahci

Thanks for helping me.

Darkn3xx

EDIT:
I just found out this interesting post : here

setpci -d 10de:0ab5 90.b=40

has to be replaced by:

setpci -d 10de:0ab5 9c.b=06

And it works just fine !

lspci -nn | grep SATA
00:0b.0 SATA controller [0106]: nVidia Corporation MCP79 SATA Controller [10de:0ab5] (rev b1)

Last edited by Darkn3xx (2011-10-04 01:08:29)