-ifeq ($(LINUX_VERSION),)
- ifeq ($(KERNEL),2.4)
- LINUX_VERSION:=2.4.33.4
- LINUX_RELEASE:=1
- LINUX_KERNEL_MD5SUM:=aca0257549c385a227088ad8853a72a2
- else
- LINUX_VERSION:=2.6.19.1
- LINUX_RELEASE:=1
- LINUX_KERNEL_MD5SUM:=2ab08fdfddc00e09b3d5bc7397d3c8be
- 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),2.6.24.5)
+ LINUX_KERNEL_MD5SUM:=26500f8f92895bd33e391088b5edd4ad
+endif
+ifeq ($(LINUX_VERSION),2.6.25.1)
+ LINUX_KERNEL_MD5SUM:=0d26fcafa00dc5cf27d4bf01301409a0
+endif
+
+# disable the md5sum check for unknown kernel versions
+LINUX_KERNEL_MD5SUM?=x
+
+KERNEL?=2.$(word 2,$(subst ., ,$(strip $(LINUX_VERSION))))
+KERNEL_PATCHVER=$(shell echo '$(LINUX_VERSION)' | cut -d. -f1,2,3 | cut -d- -f1)