-ifeq ($(LINUX_VERSION),)
- ifeq ($(KERNEL),2.4)
- LINUX_VERSION:=2.4.34
- LINUX_RELEASE:=1
- LINUX_KERNEL_MD5SUM:=f59665540a7f3351ea416a0dad104b55
- else
- LINUX_VERSION:=2.6.21.1
- LINUX_RELEASE:=1
- LINUX_KERNEL_MD5SUM:=a28b78793cd368592f7873bf36cb38b0
- endif
-endif
-KERNEL:=2.$(word 2,$(subst ., ,$(strip $(LINUX_VERSION))))
+ifeq ($(KERNEL),2.4)
+ LINUX_VERSION?=2.4.37.9
+endif
+LINUX_RELEASE?=1
+
+ifeq ($(LINUX_VERSION),2.4.37.9)
+ LINUX_KERNEL_MD5SUM:=b85b8962840c13f17f944e7b1890f8f8
+endif
+ifeq ($(LINUX_VERSION),2.6.25.20)
+ LINUX_KERNEL_MD5SUM:=0da698edccf03e2235abc2830a495114
+endif
+ifeq ($(LINUX_VERSION),2.6.30.10)
+ LINUX_KERNEL_MD5SUM:=eb6be465f914275967a5602cb33662f5
+endif
+ifeq ($(LINUX_VERSION),2.6.31.12)
+ LINUX_KERNEL_MD5SUM:=517be354b81b780e2f4b2ad614d030de
+endif
+ifeq ($(LINUX_VERSION),2.6.32.14)
+ LINUX_KERNEL_MD5SUM:=b13dc3ce727039597163cb4bce4cbdbb
+endif
+ifeq ($(LINUX_VERSION),2.6.33.4)
+ LINUX_KERNEL_MD5SUM:=f75d21e5c60f18adf0e99d61c243f964
+endif
+ifeq ($(LINUX_VERSION),2.6.34)
+ LINUX_KERNEL_MD5SUM:=10eebcb0178fb4540e2165bfd7efc7ad
+endif
+
+# disable the md5sum check for unknown kernel versions
+LINUX_KERNEL_MD5SUM?=x
+
+split_version=$(subst ., ,$(1))
+merge_version=$(subst $(space),.,$(1))
+KERNEL_BASE=$(firstword $(subst -, ,$(LINUX_VERSION)))
+KERNEL=$(call merge_version,$(wordlist 1,2,$(call split_version,$(KERNEL_BASE))))
+KERNEL_PATCHVER=$(call merge_version,$(wordlist 1,3,$(call split_version,$(KERNEL_BASE))))