-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?=2.4.35.4
+else
+ LINUX_VERSION?=2.6.21.5
+endif
+LINUX_RELEASE?=1
+
+ifeq ($(LINUX_VERSION),2.4.34)
+ LINUX_KERNEL_MD5SUM:=f59665540a7f3351ea416a0dad104b55
+endif
+ifeq ($(LINUX_VERSION),2.4.35.4)
+ LINUX_KERNEL_MD5SUM:=34066faff3d8c042df1c7600b08b8070
+endif
+ifeq ($(LINUX_VERSION),2.6.21.7)
+ LINUX_KERNEL_MD5SUM:=bc15fad1487336d5dcb0945cd039d8ed
+endif
+ifeq ($(LINUX_VERSION),2.6.22.18)
+ LINUX_KERNEL_MD5SUM:=bd375d5885bf114c74a2216d52d86e34
+endif
+ifeq ($(LINUX_VERSION),2.6.23.16)
+ LINUX_KERNEL_MD5SUM:=2637a7f1d4450bc5e27422f307fc6529
+endif
+ifeq ($(LINUX_VERSION),2.6.24.2)
+ LINUX_KERNEL_MD5SUM:=dd573a2fae55624ed92fa49c17583964
+endif
+
+# disable the md5sum check for unknown kernel versions
+LINUX_KERNEL_MD5SUM?=x
+
+KERNEL?=2.$(word 2,$(subst ., ,$(strip $(LINUX_VERSION))))
+KERNEL_PATCHVER=$(shell echo '$(LINUX_VERSION)' | cut -d. -f1,2,3 | cut -d- -f1)