Re: New "ahcisata0 port 1: device present" messages with NetBSD 9

[Jaromír Doleček <jaromir.dolecek%gmail.com@localhost>]

Le lun. 13 janv. 2020 à 11:56, Simon Burge <simonb%netbsd.org@localhost> a écrit :
> A bit more digging shows that this seems to be a (somewhat) known
> problem with Samsung EVO 860 disks and AMD SB710/750 chipsets.  The
> problem also occurs on Windows and Linux with these drives and chipsets.
>
> Here's a couple of links:
>
>   https://eu.community.samsung.com/t5/Cameras-IT-Everything-Else/860-EVO-250GB-causing-freezes-on-AMD-system/td-p/575813
>   https://bugzilla.kernel.org/show_bug.cgi?id=201693
>
> In the first, there's discussion of how Samsung haven't released a
> firmware update to address this.
>
> Jaromir - do you have any suggestions on how we can deal with this, in
> particular thinking about the soon to be released NetBSD 9.0?  Maybe
> somehow detecting this combination of disks and chipsets and disabling
> NCQ?  My concern right now is that people upgrading from NetBSD 8 or
> earlier to NetBSD 9 may experience data corruption.

If they are known broken, seems we indeed need to add a quirk entry to
disable NCQ for these drives, and push it into NetBSD 9.0 branch.

I'll make the change this week.

Jaromir