building a 32bit kernel on a 64bit machine

Hello,

There is a benchmark that I routinely use that runs a linux kernel build as part of the benchmark (the kernel that is built is of no importance; just the correctness and timing is what counts). My benchmark does this by unpacking a 2.6.8 kernel source, copying in a specific .config file, and then doing make oldconfig, make dep, and make bzImage.

This works fine under my 32-bit platforms. I now have a 64-bit platform and I'm running an x86-64 kernel. When I execute my benchmark, it attempts to build a 64-bit kernel. I want it to build the exact same kernel that it did under the 32-bit platform.

I thought that by using the same .config file, I would get the same kernel. I've tried appending "ARCH=i386" to the make commands, but this doesn't seem to work either (I get an error message "CPU you selected does not support x86-64 instruction set").

Can someone tell me what I need to change to get it to build the same kernel when running under 64-bit linux as I get under 32-bit linux? Do I need to use a cross-compiler?

Thanks!

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