On 07/04/10 03:18 PM, Alan Stern wrote:
On Wed, 7 Apr 2010, Mark Lord wrote:
Errr.. yes and no.
Yes, because nobody else is likely to do anything about it,
so I will work around the hardware bug by updating hdparm.
But no, there's no funky missing data length issue there.
Just a bridge chip that doesn't understand ATA_16 commands.
Did you look at this comment and the following one:
https://bugs.launchpad.net/ubuntu/+source/linux-fsl-imx51/+bug/431963#25
Is the engineer from Genesys Logic totally off-base?
..
Yes. As discussed already, there is *no* sector count parameter
for the (S)ATA "IDENTIFY" command. Other USB/SATA bridges handle
this correctly in SAT mode, just not this specific model.
No big deal, we'll work around it.
It's low priority for me, though.
I do have a pre-release HDPARM that uses ATA_12 for IDENTIFY,
as this is reported to work on this hardware, even though it is
otherwise _identical_ to the command issue via ATA_16.
That's another indication of a buggy/inconsistent bridge chip.
And I've also added a sector count of "1" to hdparm's IDENTIFY
commands. Properly implemented hardware/software will just ignore it
as usual, but this bridge might benefit from it.
Anyone want to give this second update a try?
Thanks
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