12 Core image size limitation
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Heavily limited platforms:
   * i386-pc (normal and PXE): the core image size (compressed) is
     limited by 458240 bytes.  kernel.img (.text + .data + .bss,
     uncompressed) is limited by 392704 bytes.  module size
     (uncompressed) + kernel.img (.text + .data, uncompressed) is
     limited by the size of contiguous chunk at 1M address.
   * sparc64-ieee1275: kernel.img (.text + .data + .bss) + modules +
     256K (stack) + 2M (heap) is limited by space available at 0x4400.
     On most platforms it's just 3 or 4M since ieee1275 maps only so
     much.
   * i386-ieee1275: kernel.img (.text + .data + .bss) + modules is
     limited by memory available at 0x10000, at most 596K

   Lightly limited platforms:

   * *-xen: limited only by adress space and RAM size.
   * i386-qemu: kernel.img (.text + .data + .bss) is limited by 392704
     bytes.  (core.img would be limited by ROM size but it's unlimited
     on qemu
   * All EFI platforms: limited by contiguous RAM size and possibly
     firmware bugs
   * Coreboot and multiboot.  kernel.img (.text + .data + .bss) is
     limited by 392704 bytes.  module size is limited by the size of
     contiguous chunk at 1M address.
   * mipsel-loongson (ELF), mips(el)-qemu_mips (ELF): if uncompressed:
     kernel.img (.text + .data) + modules is limited by the space from
     80200000 forward if compressed: kernel.img (.text + .data,
     uncompressed) + modules (uncompressed) + (modules + kernel.img
     (.text + .data)) (compressed) + decompressor is limited by the
     space from 80200000 forward
   * mipsel-loongson (Flash), mips(el)-qemu_mips (Flash): kernel.img
     (.text + .data) + modules is limited by the space from 80200000
     forward core.img (final) is limited by flash size (512K on yeeloong
     and fulooong)
   * mips-arc: if uncompressed: kernel.img (.text + .data) is limited by
     the space from 8bd00000 forward modules + dummy decompressor is
     limited by the space from 8bd00000 backward if compressed:
     kernel.img (.text + .data, uncompressed) is limited by the space
     from 8bd00000 forward modules (uncompressed) + (modules +
     kernel.img (.text + .data)) (compressed, aligned to 1M) + 1M
     (decompressor + scratch space) is limited by the space from
     8bd00000 backward
   * powerpc-ieee1275: kernel.img (.text + .data + .bss) + modules is
     limited by space available at 0x200000

