>From linux@xxxxxxxxxxx Thu Nov 12 00:37:24 2009
Date: 11 Nov 2009 19:37:23 -0500
From: "George Spelvin" <linux@xxxxxxxxxxx>
To: linux@xxxxxxxxxxx, stern@xxxxxxxxxxxxxxxxxxx
Subject: Re: NEC USB controller strangeness
Cc: linux-usb@xxxxxxxxxxxxxxx
In-Reply-To: <20091111235217.11337.qmail@xxxxxxxxxxxxxxxxxxx>
Sweet!
With the same less-PCI-bridges configuration as last time, the Sandisk Cruzer
Bus 004 Device 007: ID 0781:5406 SanDisk Corp. Cruzer Micro 1/2/4GB Flash Drive
appears to be rock-stable. I'm currently copying movie files to and from it
without a hiccup, which would insta-hang it before.
The Transcend device is just plain buggy; I sort of knew that, which is why
it was sitting in the junk pile.
Unfortunately, I can't do an equivalent test on the Phenom because it doesn't
include a similar discrete PCIe-to-PCIe bridge.
If anyone has a similar situation, the very common PCIe USB cards
containing a bridge chip and NEC USB chip:
01:00.0 PCI bridge [0604]: PLX Technology, Inc. PEX8112 x1 Lane PCI Express-to-PCI Bridge [10b5:8112] (rev aa)
02:00.0 USB Controller [0c03]: NEC Corporation USB [1033:0035] (rev 43)
02:00.1 USB Controller [0c03]: NEC Corporation USB [1033:0035] (rev 43)
02:00.2 USB Controller [0c03]: NEC Corporation USB 2.0 [1033:00e0] (rev 04)
is unstable if plugged into either of the top two (x4) PCIe slots on a
2009 (i7) Mac Pro. It is stable if plugged into slot 2 (x16).
The top two slots are provided by a PCIe 2.0 bridge:
01:00.0 PCI bridge [0604]: Integrated Device Technology, Inc. PES12T3G2 PCI Express Gen2 Switch [111d:8061] (rev 01)
02:02.0 PCI bridge [0604]: Integrated Device Technology, Inc. PES12T3G2 PCI Express Gen2 Switch [111d:8061] (rev 01)
02:04.0 PCI bridge [0604]: Integrated Device Technology, Inc. PES12T3G2 PCI Express Gen2 Switch [111d:8061] (rev 01)
It may be that the true fault lines with the PCIe support there; it'll
take someone pretty good to track it down.
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