I recently got banana pi m2u and I wanted to make a small home nas server with the old hard drives lying around. So I brought Sata port multiplier too. I am using Raspbian Jiessie ( kernel version - 3.10.107 ) and I want know how to use sata port multiplier. I just plug it in and see it work but sadly it won’t work
I’m the same problem with bpi m2u
**pi@bpi-m2u ~]$ dmesg | grep sunxi-ahci** **[ 1.432717] sunxi-ahci sata: sata_regulator0 "vdd-sata-25"!** **[ 1.432795] sunxi-ahci sata: sata_regulator1 "vdd-sata-12"!** **[ 1.433810] sunxi-ahci sata: regulator "vdd-sata-25" voltage set: 2500000 to 2500000!** **[ 1.434749] sunxi-ahci sata: regulator "vdd-sata-12" voltage set: 1200000 to 1200000!** **[ 1.436946] sunxi-ahci sata: frequncy of module clk for AHCI: 100000000** **[ 1.436957] sunxi-ahci sata: frequncy of pll clk for AHCI: 100000000** **[ 1.500039] sunxi-ahci sata: SATA power enable do not exist!!** **[ 1.506473] sunxi-ahci sata: controller can't do PMP, turning off CAP_PMP** **[ 1.506484] sunxi-ahci sata: forcing PORTS_IMPL to 0x1** **[ 1.506538] sunxi-ahci sata: AHCI 0001.0100 32 slots 1 ports 3 Gbps 0x1 impl platform mode** **[ 1.506552] sunxi-ahci sata: flags: ncq sntf pm led clo only pio slum part ccc ** **[ 1.508062] scsi0 : sunxi-ahci**
How to force PMP sata ?
I try “nano /etc/modprobe.d/ahci-sunxi.conf” with “options ahci-sunxi enable_pmp=1”
I find this
I try to compile kernel PMP like module for trying…
Did it Work ? and how did you compile kernel PMP I am that not experienced with these things
Is broken, I don’t know why ? Impossible to enable PMP with old kernel. I wait for 4.9 kernel.
It’s neither broken nor you need a new kernel. You just bought a device that receives zero support.
I built the kernel with the boring simple fix, let a friend test and documented it in linux-sunxi wiki: http://linux-sunxi.org/SATA#PMP_support_-_using_SATA_port_multipliers_with_sunxi_devices
(just work you through the ‘R40/V40 also support port multipliers’ link there but you have to be fast since in this forum here for funny reasons posts get deleted)
Note that after they tell you how to do it, they explain why its a bad idea.