compiling 32-bit kernel for 64-bit platform

["vikaas sohal" <vikaassohal@xxxxxxxxx>]

Hi,

I'm trying to compile a 32-bit linux kernel to run on my x86_64, so that i can run RTAI. I have tried following the instructions for cross-compilation on the kernelnewbies FAQ, and have searched for help on the web, but think I am still missing something basic.

Here's what I've done so far: 

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1. used rpm to check for binutils, etc.

2. downloaded the i686 cross-compiler from http://developer.osdl.org/dev/plm/cross_compile/
.  Installed this in /var/crosstools

3. added the cross-compile tool directory to the path, i.e. "export PATH=$PATH:/var/crosstool/i686-unknown-linux-gnu/gcc-4.0.0-glibc-2.3.5"

4. configured the kernel, 
i.e., "make CROSS_COMPILE=i686-unknown-linux-gnu- ARCH=i386 menuconfig" and verfied that the configuration included generic x86 support (instead of support for an x86_64 processor)

5. tried to compile the kernel.  according to the kernelnewbies FAQ, i should be able to run, "make CROSS_COMPILE=i686-unknown-linux-gnu- all," but this doesn't find the cross-compiler, 
i.e. i get the following error: "make: i686-unknown-linux-gnu-gcc: Command not found."

6. So then i tried explicitly specifying the location of the cross-compiler, i.e., "make CROSS_COMPILE=/var/crosstool/i686-unknown-linux-gnu/gcc-
3.4.2-glibc-2.3.3/i686-unknown-linux-gnu/bin/ ARCH=i386 all".  However, now i get errors suggesting that i am still compiling a 64-bit kernel, e.g.: "integer constant is too large for 'unsigned long' type", "warning: right shift count >= width of type", and " warning: cast from pointer to integer of different size".

7. i tried adding the flag, "CFLAGS=-m32" to tell gcc to do a 32-bit compilation, but i get the same errors.

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again, i've tried to follow the information i've found online so far, but seem to be missing something basic.  can anyone help?

thanks,
vikaas