This has been resolved.
:/lib/modules/2.6.15-18-386 $ find . -name "xircom*" -print
./kernel/drivers/net/tulip/xircom_tulip_cb.ko
./kernel/drivers/net/tulip/xircom_cb.ko
** Changed in: linux-source-2.6.15 (Ubuntu)
Status: Fix Committed => Fix Released
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xircom_tulip_cb not included
https://launchpad.net/malone/bugs/27382