Messages in this thread | | | Date | Fri, 16 Nov 2007 13:43:20 +0100 | From | Andreas Herrmann <> | Subject | Re: Kconfig: ARCH=x86 |
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On Fri, Nov 16, 2007 at 12:14:46PM +0100, Andreas Herrmann wrote: > BTW, is the x86 kernel build documented somewhere? > At a first glance I didn't find anything suitable under Documentation/. > Maybe some explanation (like the above) should be added there.
When the ARCH=x86 build is documented, some words about cross-compilation should be added:
(1) To compile a 32-bit kernel on a 64-bit system you have to Disable 64bit support in menuconfig (config, oldconfig etc.). A subsequent kernel compile will build a 32-bit kernel. No cross compiler is needed.
(2) To compile a 64-bit kernel on a 32-bit system you have to switch on 64-bit support in menuconfig (or config, oldconfig, etc.). For the subsequent kernel compile a cross compiler (supporting 64-bit) is needed. You have to use a command line like
# make CROSS_COMPILE=x86_64-pc-linux-gnu-
to cross compile your kernel.
Regards,
Andreas
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