On Tue, Sep 17, 2013 at 10:45:25PM +0200, Arnd Bergmann wrote:

On Tuesday 17 September 2013, Uwe Kleine-K?nig wrote:

quoted

 arch/arm/Kconfig                               |  16 +++-
 arch/arm/Kconfig.debug                         |  16 ++++
 arch/arm/Makefile                              |   1 +
 arch/arm/configs/efm32_defconfig               | 104 +++++++++++++++++++++++++
 arch/arm/mach-efm32/Makefile                   |   1 +
 arch/arm/mach-efm32/Makefile.boot              |   2 +
 arch/arm/mach-efm32/cmu.h                      |  15 ++++
 arch/arm/mach-efm32/common.c                   |  19 +++++
 arch/arm/mach-efm32/common.h                   |   1 +
 arch/arm/mach-efm32/dtmachine.c                |  31 ++++++++
 arch/arm/mach-efm32/include/mach/debug-macro.S |  48 ++++++++++++
 arch/arm/mach-efm32/include/mach/entry-macro.S |   5 ++
 arch/arm/mach-efm32/include/mach/io.h          |   6 ++
 arch/arm/mach-efm32/include/mach/irqs.h        |   6 ++
 arch/arm/mach-efm32/include/mach/timex.h       |   7 ++

You should be able to add NOMMU platforms in combination with CONFIG_MULTIPLATFORM
now, which gets rid of most of these files.

I made that work now and can prepare a patch. I had to drop "depends on
!ARCH_MULTIPLATFORM" from XIP_KERNEL. That's because my machine only
works with XIP_KERNEL as it only has 4 MiB of RAM.

Also note that for !MMU you need to specify the base address and size of
your RAM (DRAM_BASE, DRAM_SIZE) and flash (FLASH_MEM_BASE, FLASH_SIZE).
So the resulting image is hardly runnable on different machines. (I
don't know off-hand why these are needed though, maybe this can be
discussed away.)

So ARCH_MULTIPLATFORM is only good as it allows to simplify a few
things, but the result isn't really multi-platform.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |