Here's a fix.
diff -Nru kernel-package-11.001/kernel/ruleset/targets/image.mk kernel-package-11.001/kernel/ruleset/targets/image.mk
--- kernel-package-11.001/kernel/ruleset/targets/image.mk 2008-01-14 15:40:43.000000000 -0800
+++ kernel-package-11.001/kernel/ruleset/targets/image.mk 2008-09-25 15:16:39.000000000 -0700
@@ -110,6 +110,7 @@
mv System.map System.precious
endif
$(MAKE) $(EXTRAV_ARG) INSTALL_MOD_PATH=$(INSTALL_MOD_PATH) \
+ INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware/$(version) \
$(CROSS_ARG) ARCH=$(KERNEL_ARCH) modules_install
ifneq ($(strip $(KERNEL_CROSS)),)
mv System.precious System.map
