最近在做XUP，V2Pro上的LINUX移植，按照风雷的文章做的，遇到启动时系统停在"booting the kernel"的问题，在网上查了查，解答的人很少，论坛里也没有人回答。我把我收集的答案给大家分享一下，由于要给MAIL LIST上的朋友回信息，所以写成英文的，英文很烂，能看懂就行，欢迎拍砖。
if your linux hang at "boot the kernel", the reasons can be list as follows:
1:If you use the uartlite IP in your design , set "console=ttyUL0"
If you use the uart_16xxx IP in your design , set "console=ttyS0"
2:If you use pwerpc-gcc version is 4.1.0,it will errorly compile the 2.6 kernel.I sugget use 3.4.4.
3:If you download the uncompressed kernel into XUP,as "dow vmlinux,con".The reason is uncompressed kernel have not the booter,so booter not set your Data_cache on right state.You can insert the code which set the Data_cache before early_init().
4:It may be your ppc's TLB bug ,search TLB on the website "xilinx.com",there is the patch.
5:If you use the U-boot,may be the U-boot 's parameter not set correct, the ppc on xup have 16k cache, some U-boot set it 8k.
6:If you "cp ml300_deconfig .config",the default ram size is 64M. If your sdram is smaller than this ,it may be the probelm.
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