sata link speed on amd hudson

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Dear linux-ide,

i was setting up a linux install on a brand new Lenovo x120e laptop,
which is based on AMD's E-350 "Zacate" platform, when i realized that
the sata link speed was only reported as being 3.0 Gbps. While as far
as i know the particular machine has not been advertised as supporting
6 Gbps sata, i had expected the chipset to make use of it [1].

The controller device is a 1002:4391. I am using it with kernel
2.6.39-rc1 on an Intel SSD that supports 6 Gbps link speeds (as
confirmed by hdparm). In sysfs, I read sata_spd as "3.0 Gbps" and both
"sata_spd_limit" and "hw_sata_spd_limit" as "<unknown>".

On boot, the device comes up as:
ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata1.00: ATA-8: INTEL SSDSC2MH120A2, PPG2, max UDMA/133
ata1.00: configured for UDMA/133

Any suggestions?

thanks,
gohai


[1] http://ixbtlabs.com/articles3/mainboard/chipset-hudson-m1.html
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