initrd and uImage

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Hi,
First off i have a ppc based board.
and i'm trying to load a kernel image with ramdisk rootfs.

i have build the kernel. it spit uImage,zImage and vmlinux.gz

my question are.
1) what are all the different image types ? 
i know the uImage is just the kernel, what are the rest (zImage & vmlinux.gz)?

2) i'm using u-boot as the bootldr. so i download the uImage (cause zImage and vmlinux.gz aren't bootlable) from tftp server and then do bootm <address> the kernel only load partially. How does the kernel know where/how to load the rootfs ? 


thanks !




      
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