# Use the default kernel version if the Makefile doesn't override it
-ifeq ($(LINUX_VERSION),)
- ifeq ($(KERNEL),2.4)
- LINUX_VERSION:=2.4.34
- LINUX_RELEASE:=1
- LINUX_KERNEL_MD5SUM:=f59665540a7f3351ea416a0dad104b55
- else
- LINUX_VERSION:=2.6.21.5
- LINUX_RELEASE:=1
- LINUX_KERNEL_MD5SUM:=2e9a302b5d514b231640227d6a2ab7bf
- endif
-endif
-KERNEL:=2.$(word 2,$(subst ., ,$(strip $(LINUX_VERSION))))
+ifeq ($(KERNEL),2.4)
+ LINUX_VERSION?=2.4.37.5
+else
+ LINUX_VERSION?=2.6.21.7
+endif
+LINUX_RELEASE?=1
+
+ifeq ($(LINUX_VERSION),2.4.37.5)
+ LINUX_KERNEL_MD5SUM:=cb221187422acaf6c63a40c646e5e476
+endif
+ifeq ($(LINUX_VERSION),2.6.21.7)
+ LINUX_KERNEL_MD5SUM:=bc15fad1487336d5dcb0945cd039d8ed
+endif
+ifeq ($(LINUX_VERSION),2.6.25.20)
+ LINUX_KERNEL_MD5SUM:=0da698edccf03e2235abc2830a495114
+endif
+ifeq ($(LINUX_VERSION),2.6.28.10)
+ LINUX_KERNEL_MD5SUM:=c4efb2c494d749cb5de274f8ae41c3fa
+endif
+ifeq ($(LINUX_VERSION),2.6.30.10)
+ LINUX_KERNEL_MD5SUM:=eb6be465f914275967a5602cb33662f5
+endif
+ifeq ($(LINUX_VERSION),2.6.31.6)
+ LINUX_KERNEL_MD5SUM:=485472df88af84becdcf47f45de3ba46
+endif
+ifeq ($(LINUX_VERSION),2.6.32)
+ LINUX_KERNEL_MD5SUM:=260551284ac224c3a43c4adac7df4879
+endif
+
+# disable the md5sum check for unknown kernel versions
+LINUX_KERNEL_MD5SUM?=x
+
+split_version=$(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))))