Thank you very much Adam :-)

I've modified 'l4linux/arch/l4/Kconfig' as follows..
===============

...(omitted)..

  prompt "Platform support"
  default L4_PLATFORM_GENERIC
  depends on L4_ARCH_ARM

  config L4_PLATFORM_GENERIC
          bool "Generic"
          select CLKDEV_LOOKUP
          select L4_CLK_NOOP 
          ("I've added the content below")
          select HAVE_CLK_PREPARE
          select HAVE_MACH_CLKDEV
          select COMMON_CLK

...(omitted)..

===============

So,I've succeeded in enabling 'CONFIG_COMMON_CLK'.

- Taeung -

On 04/29/2014 06:44 AM, Adam Lackorzynski wrote:

On Mon Apr 28, 2014 at 18:51:13 +0900, Taeung wrote:

I'm trying to build L4 Linux with added option of MMC device driver.

When I've tried to compile L4 Linux , I've failed it with error log such
as..
==============
drivers/built-in.o: In function `sdhci_pltfm_clk_get_max_clock':
/home/taeung/test/source/l4linux/drivers/mmc/host/sdhci-pltfm.c:43:
undefined reference to `clk_get_rate'
make[1]: *** [vmlinux] Error 1
make: *** [sub-make] Error 2
==============

After I saw the log , I've guessed the  cause is that 'drivers/clk/clk.c'
was not built.
So, I must enable  'CONFIG_COMMON_CLK' , to build 'drivers/clk/clk.c'

How to enable 'CONFIG_COMMON_CLK' ?

You need to add 'select COMMON_CLK' to some platform config block (such
as L4_PLATFORM_GENERIC).



Adam