Info: (grub) Core image size limitation

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 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