It looks like that your command "bootm" is incorrect
See the page 148 of LSDK 19.03 documentation.
=> bootm a0000000#<board-name>
The <board-name> can be: ls1012ardb, ls1012afrwy, ls1043ardb, ls1046ardb, ls1088ardb, ls2088ardb.
Have a great day,
Pavel Chubakov
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