u-boot/arch/powerpc/cpu/mpc512x/common.c

#include <common.h>
#include <asm/io.h>

#if defined(CONFIG_POST) || defined(CONFIG_LOGBUFFER)

#if defined(CONFIG_SYS_POST_WORD_ADDR)
# define _POST_ADDR	(CONFIG_SYS_POST_WORD_ADDR)
#else
#error echo "No POST word address defined"
#endif

void post_word_store(ulong a)
{
	volatile void *save_addr = (volatile void *)(_POST_ADDR);

	out_be32(save_addr, a);
}

ulong post_word_load(void)
{
	volatile void *save_addr = (volatile void *)(_POST_ADDR);

	return in_be32(save_addr);
}
#endif  /* CONFIG_POST || CONFIG_LOGBUFFER */