help. a question on "make menuconfig"

[Ming Liu]

Hi,
I am a novice for embendded linux. My platform is Xilinx Virtex4 (PPC405). 
I have downloaded the kernal source of linuxppc_2_4_devel and modified the 
Makefile as:
ARCH := ppc
CROSS_COMPILE = powerpc-405-linux-gnu-

But when I execute "make menuconfig", the following error happens,

mingliu at linux:~/linuxppc_2_4_devel> make menuconfig 
make: *** arch/ppc: Is a directory.  Stop. 
mingliu at linux:~/linuxppc_2_4_devel> 

Why this error happened? Is there something wrong with the Makefile? I did 
nothing except for specifying the ARCH and the CROSS_COMPILE.

Thanks for your help.

                                                              BR
                                                                 Ming

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