So, others books wrongs:
O'Reilly - Lpi Linux Certification In A Nutshell - page 317:
The bzImage file is our ultimate goal, a bootable kernel image file,
compressed using the bzip2 utility.* It is created in this step along with some
additional support files needed for boot time.
Que - ExamCram2 LPIC - page 348:
zImage—Makes a compressed kernel using the gzip compression option.
bzImage—Makes a compressed kernel using the bzip2 compression option.
more others opnions:
Wave - Linux System Administration - page 318:
What is the difference between a zImage and a bzImage?
zImage must be used on non-i386 architectures and is also limited to a 1-MB
uncompressed file size. bzImage is not limited in its file size.
The difference between 'zImage' files and 'bzImage' files is that 'bzImage' uses a different layout and a different loading algorithm, and thus has a larger capacity. Both files use gzip compression. The 'bz' in 'bzImage' stands for 'big zImage', not for 'bzip'!
Sams - Red Hat Linux Fedora 3 Unleashed:
-zImage This directive compiles the kernel, creating an uncompressed file called zImage.
-bzImage This directive creates a compressed kernel image necessary for some systems that require the kernel image to be under a certain size for the BIOS to be able to parse them;
Hungry Minds - Debian GNU-Linux Bible:
Because the kernel image was too big in Step 2, you now need to use a different
compression method. Run make bzImage to create the image using the
alternative compression method.
aff, this is very complex!!!
so I am think in create my proper theory hahaha!