uImage: implement gzip support (Hollis Blanchard) Based on gzip uImage loading code from u-boot. Signed-off-by: Jerone Young <jyoung5@us.ibm.com> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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