A size of 16MB for the kernel is likely adequate.
+kernel_comp_addr_r:
+ Optional. This is only required if user wants to boot Linux from a compressed
+ Image(.gz, .bz2, .lzma, .lzo) using booti command. It represents the location
+ in RAM where the compressed Image will be decompressed temporarily. Once the
+ decompression is complete, decompressed data will be moved kernel_addr_r for
+ booting.
+
+kernel_comp_size:
+ Optional. This is only required if user wants to boot Linux from a compressed
+ Image using booti command. It represents the size of the compressed file. The
+ size has to at least the size of loaded image for decompression to succeed.
+
pxefile_addr_r:
Mandatory. The location in RAM where extlinux.conf will be loaded to prior