kcore (kernel core) is a virtual file (on vfs) and is like the mirror of the memory space that kernel can allocate the amount of this memory size (think kernel memory) and it doesnt use the physical disk space and memory.shortly it equals to RAM size.We can may understand from that the kernel read/write and the other mem operations to use the kdebug utilites
# ls -ltr /proc/kcore|awk '{print $5/1024/1024/1024"GB"}'
shortly it equals to RAM size,additional some platforms also it corresponds to virtual memory space for kernel..
then could be try (ia64 , im not sure,)