From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michael Lawnick <nospam_lawnick@gmx.de>
Date: Mon, 23 Feb 2009 08:18:27 +0100
Subject: [U-Boot] Error uncompressing kernel image
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Alemao said the following:
>     return Z_MEM_ERROR;
> --------
> 
> Any ideas why this is happening?
Out of memory.

You don't tell us processor architecture/type. In my case (PPC, u-boot
1.3.3 ff) I'd take a look into include/configs/<board>.h and would
increase the constant CONFIG_SYS_MALLOC_LEN

HTH
-- 

Michael