Cleanup the mess in the ext2 target

#

# Build the ext2 root filesystem image

#

# Known problems :

#  - genext2fs: couldn't allocate a block (no free space)

#  

#    Since genext2fs allocates only one group of blocks, the FS 

#    size is limited to a maximum of 8 Mb.

#

#############################################################

# how much KB we want to add to the calculated size for the root directory,

# to have additional space

GENEXT2_ADDTOROOTSIZE := 512

# maximal rootfilesystem size that can be handled

# by genext2fs

GENEXT2_MAXROOTSIZE := 8192

# How much KB we want to add to the calculated size for slack space

GENEXT2_ADDTOROOTSIZE=4096

GENEXT2_REALSIZE=$(subst total,, $(shell du $(TARGET_DIR) -s -c -k | grep total )) 

GENEXT2_SIZE=$(shell expr $(GENEXT2_REALSIZE) + $(GENEXT2_ADDTOROOTSIZE))

# We currently add about 400 device nodes, so add that into the total