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4f1c73d592
Before starting the kernel:
1. parse environment block (if any) and create a hash table
of all found pairs (NAME, VALUE);
2. scan the command line, which already contains extra-parameters
(if any), and for each found ${NAME} replace it with VALUE, as
found in the hash table by NAME.
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Eduard Shishkin <edward6@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>