On 07/11/2011 01:51 PM, Connie Sieh wrote:
On Mon, 11 Jul 2011, Yasha Karant wrote:
I have been attempting to get a working USB 3 external harddrive
subsystem. Thus far, no go.
Here is what I have found:
1. kernel 2.6.38.6-26.rc1.fc15.x86_64 works fine for USB 3, but
requires gcc 4.6 to build any kernel modules; RHEL 6 (SL 6, CentOS 6)
uses gcc 4.4. Thus, neither the Nvidia nor VirtualBox modules will
build on on a RHEL 6 system.
2. kernel 2.6.33.3-85.fc13.x86_64 that was built with gcc 4.4 works,
but only partially -- please see point 3.
3. After installing both of the above kernels, kernel
2.6.32-131.2.1.el6.x86_64 now functions essentially the same as
2.6.33.3-85.fc13.x86_64 . The device is recognized and /dev/sde and the
partitions thereunder /dev/sde1 ... are created. However, no automount
points are created that were created with 2.6.38.6-26.rc1.fc15.x86_64 .
Moreover, fdisk /dev/sde fails. A reading of dmesg shows numerous
exceptions and diagnostics that are documented in USB 3 linux kernel
development hits during a web search and that evidently were fixed in
later kernels (such as 2.6.38.6-26.rc1.fc15.x86_64 ). I am not going to
reproduce these here, but suffice it to say that the /dev/sde set
appears, vanishes as evidenced by the output of /ls/dev/sd* and then
reappears.
Note that all of the hardware and systems commands, etc., work on a USB
2 port on this system.
An attempt to build from source 2.6.38.6-26.rc1.fc15.x86_64 using the
gcc 4.4 system of SL6 is my next step, rpmbuild --rebuild
kernel-2.6.38.6-26.rc1.fc15.src.rpm .
Yasha Karant
Since usb 3 worked for your chipsets on a prior RHEL 6 kernel and does
not work on the current RHEL 6 kernel . I suggest you search
bugzilla.redhat.com looking for your issue. If you do not find the issue
please bugzilla it.
-Connie Sieh
Perhaps I have been unclear. USB 3 has never fully worked on any RHEL 6
(SL 6) kernel that I have tried. USB 3 worked under OpenSUSE and worked
under 2.6.38.6-26.rc1.fc15.x86_64, but 2.6.38 is a kernel presumably in
the future, not past, of RHEL . Note that as a test, I have changed the
specific instance of the USB 3 device I have been using with a new
sample shipped from the vendor; I have not verified if the new sample
uses the same firmware, etc., as the first sample, although I suspect it
does. The fact that the hardware fully does work under
2.6.38.6-26.rc1.fc15.x86_64, under OpenSUSE, and on a USB 2 port under
2.6.32-131.2.1.el6.x86_64 leads me to believe that there is an issue
between the USB 3 driver in the current SL 6 and the actual motherboard
USB 3 hardware on my machine, an issue that evidently is fixed in later
releases of kernel 2.6 .
Yasha Karant
