On 9/7/06, vikaas sohal <vikaassohal@xxxxxxxxx> wrote:
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.
I do this to compile a 32 bit i386 kernel on my x86_64 bit machine. For all the commands, just append the string "ARCH=i386" . Dunno the exact validity of this procedure, but hey it works for me... (I think the 32 bit tool chain is installed by default on most (all?) 64 bit distributions - mine is Fedora Core 3) # make xconfig ARCH=i386 # make ARCH=i386
Here's what I've done so far: --- 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. ---- 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
Bhanu. -- I look to the future because that's where I'm going to spend the rest of my life. -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
