Some questions about kernel tailoring

[dfsd df <tomcs163@yahoo.com.cn>]

Hello, everybody:

     Now, I participate to porting linux to MIPS platform. I'm a newbie.

 

     I met some questions, I hope somebody can tell me why or give me some hints! thanks!

 

The board is Malta, CPU is MIPS4kc. I downloaded kernel src from ftp.mips.com

 

    1. I use "make zImage" for kernel-2.4.3, everything is ok!

 But using "make zImage" for kernel-2.4.18, I failed, It could only build a vmlinux file.

I  find it's because of no rules in arch/mips/boot/Makefile to build zImage.

So I modified the arch/mips/boot/Makefile, It worked fine.

 but when excuted "./mkboot zImage.tmp zImage", It generated a very big zImage file. After noticing "file size exceed", the system delete the zImage file automatically!

 

what's wrong about it? It's ok for kernel-2.4.3. and I can make sure that the mkboot is no problem.

 

2. I only selectd board and cpu type when compiling the kernel-2.4.3.

If using make ,the vmlinux size is about 780k. If using "make zImage", the zImage file is about 580k.

I think that's a minimun size by using "make menuconfig".

but I use gzip to compress this two files, its size became only 1/3 of their original size.

 

So I'm puzzled why "make zImage" don't use gzip compress method? If so , we can get a more small kernel, isn't it?

 

thanks again!

 

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