uncompressing zImage

I am unable to complete gunzip called from arch/ppc/boot/simple/misc.c. The gunzip code is in arch/ppc/boot/common/misc-common.c & it is trying to do "zalloc()". Here i am getting avail_ram greater than end_avail. So its stops executing further. I have my RAM from 0x00000000 to 0x02000000. In this I had copied zImage at 0x00800000. Now i am unable to continue from misc.c file's decompress algorithm. Please provide me some tips or suggestions.

Thanks & Regards,
Sarpa

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