and here is an omap4 kernel + ehci fix compiled with gcc 4.6:
http://people.canonical.com/~ppisati/lp791552/linux-
image-2.6.38-1209-omap4_2.6.38-1209.14~gcc4.6-ehcifix_armel.deb

** Description changed:

- Neither the beagle (rev C4) nor the beagle XM (rev B) USB ports work
- with the 2.6.39 kernel.  Without USB, there is no keyboard or network.
+ SRU Justification:
+ 
+ Impact: when compiled with gcc 4.6, we loose usb on every omap* hw.
+ Fix: see attached patch.
+ Testcase: compile an omap[4] kernel witg gcc 4.6 and boot it, you will notice 
there are no usb devices present.
+ 
+ beagle xm, natty kernel and gcc 4.6:
+ 
+ flag@ubuntu:~$ lsusb
+ Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+ Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+ 
+ versus
+ 
+ beagle xm, natty kernel and gcc 4.6 + ehci fix:
+ 
+ flag@ubuntu:~$ lsusb
+ Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+ Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+ Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.
+ Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
+ Bus 001 Device 004: ID 03f0:5307 Hewlett-Packard
+ 
+ ===
+ Neither the beagle (rev C4) nor the beagle XM (rev B) USB ports work with the 
2.6.39 kernel.  Without USB, there is no keyboard or network.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: linux-image-omap 2.6.39.3.4
  ProcVersionSignature: User Name 2.6.39-3.10-omap 2.6.39
  Uname: Linux 2.6.39-3-omap armv7l
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices: Error: [Errno 2] No such file or directory
  Architecture: armel
  ArecordDevices: Error: [Errno 2] No such file or directory
  CurrentDmesg: [   70.234100] Adding 524284k swap on /SWAP.swap.  Priority:-1 
extents:137 across:793660k SS
  Date: Wed Jun  1 13:03:46 2011
  Lsusb:
-  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
-  Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  ProcEnviron:
-  SHELL=/bin/bash
-  LANG=en_US.UTF-8
+  SHELL=/bin/bash
+  LANG=en_US.UTF-8
  ProcKernelCmdLine: ro elevator=noop vram=12M omapfb.mode=dvi:1280x720MR-16@60 
mpurate=1000 root=UUID=2ef1c514-c425-4402-acf8-0a515a608d3a fixrtc quiet splash 
console=ttyO2,115200n8
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/791552

Title:
  No USB support on beagle/beagleXM

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