[iPAQ] improved xmodem upload script

Hi. I've improved on Nils Faerber's xmodem download script, archived
at http://www.handhelds.org/pipermail/ipaq/2000-September/000464.html
Using it, I upgraded to 0.15 using the following commands:

export TTY=/dev/ttyR1
./setipaqtty $TTY
./ipaqsendfile 'load kernel' zImage-2.4.0-test6-rmk5-np2-hh3 $TTY
./ipaqsendfile 'load flash 0x100000' init-2-40.cramfs $TTY
./ipaqsendfile 'load flash 0x200000' root-2-40.cramfs $TTY
./ipaqsendfile 'load flash 0x500000' usr-2-40.cramfs $TTY

----------------ipaqsendfile----------------
#!/bin/sh

if [ -z "$1" -o -z "$2" -o -z "$3" ]; then
        echo "Usage:"
        echo " $0 <command> <filename> <ttydev>"
        exit
fi

if md5sum -c $2.md5sum; then
        echo "md5sum checked... ok"
else
        echo "md5sum failed... exiting"
        exit
fi
echo "$1" > $3
sx -b $2 > $3 < $3
cat $3
----------------end of ipaqsendfile----------------

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