Buildroot 2011.11 on x86_64 - no modules are loaded at startup

Hi,

I compiled the buildroot-2011.11 for x86_64 platform. Unfortunately
after the startup the device drivers are not loaded. I've tried to use
both mdev and udev, and results are the same.
I have the following settings in the kernel configuration:
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y

When I load the drivers manually:
eg. (on qemu-system-x86_64):
#modprobe e1000
#modprobe uhci_hcd

the NIC and the USB device (passed by -usbdevice host:0xabcd:0xcdef)
are recognized correctly.
The syptoms were the same on the real hardware (E350M1 board) which
currently not available to me.

The "mount" command returns the following:
rootfs on / type rootfs (rw,relatime)
devtmpfs on /dev type devtmpfs
(rw,relatime,size=998680k,nr_inodes=249670,mode=755)
proc on /proc type proc (rw,relatime)
devpts on /dev/pts type devpts
(rw,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /dev/shm type tmpfs (rw,relatime,mode=777)
tmpfs on /tmp type tmpfs (rw,relatime)

What's interesting, the modinfo in the buildroot environment does not
report
information related to udev/mdev for modules.
On my host machine however the modinfo command reports correctly
the list of PCI aliases for the same modules.

I don't know if I have misconfigured something, or if there is
something wrong
with the buildroot 2011.11?
I have sent more detailed report together with my configuration files
to buildroot
mailing list: http://lists.busybox.net/pipermail/buildroot/2011-December/048639.html
--
TIA & Regards,
Wojtek

OK. The solution was simple.
The modprobe was installed in /usr/sbin, while udev rules called it
as /sbin/modprobe.
I've added a symlink /sbin/modprobe pointing to /usr/sbin/modprobe,
and modules are loaded autmatically!
--
Regards,
Wojtek