about kernel version

[elife]

Hi,
  I downloaded http://olpc.download.redhat.com/olpc/streams/development/latest/devel_ext3/olpc-redhat-stream-development-build-193-20061203_1727-devel_ext3.img.bz2

 and upgraded to its linuxbios. Then I installed it to nand,  everything
work fine. Then I want to make my usb ethernet work. I need to build
ndiswrapper and install it. But the kernel code I git from olpc-2.6 is
2.6.19-rc2, and kernel in stream-development-build-192 is
2.6.18-20061112.7.olpc. Where can I find the kernel source for
2.6.18-20061112.7.olpc or how can I upgrade kernel in olpc board to
2.6.19-rc2?
<http://olpc.download.redhat.com/olpc/streams/development/latest/devel_ext3/olpc-redhat-stream-development-build-193-20061203_1727-devel_ext3.img.bz2>
Best Regards!
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