eliminate the build error using rk2928_tb_defconfig/rk2928_sdk_defconfig.
as the following:
UPD include/generated/compile.h
CC init/version.o
LD init/built-in.o
LD .tmp_vmlinux1
drivers/built-in.o: In function rk29_sdmmc_gpio_open'
make: *** [.tmp_vmlinux1] Error 1
*************************************************************************/
#if !defined(CONFIG_SDMMC_RK29_OLD)
-static void rk29_sdmmc_gpio_open(int device_id, int on)
+//static void rk29_sdmmc_gpio_open(int device_id, int on)
+void rk29_sdmmc_gpio_open(int device_id, int on)
{
switch(device_id)
{