diff --git a/arch/sandbox/cpu/cpu.c b/arch/sandbox/cpu/cpu.c
index d7684d3..6459b01 100644
--- a/arch/sandbox/cpu/cpu.c
+++ b/arch/sandbox/cpu/cpu.c
@@ -57,6 +57,11 @@ void *map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
 	return (void *)(gd->ram_buf + paddr);
 }
 
+phys_addr_t map_to_sysmem(void *ptr)
+{
+	return (u8 *)ptr - gd->ram_buf;
+}
+
 void flush_dcache_range(unsigned long start, unsigned long stop)
 {
 }
diff --git a/arch/sandbox/include/asm/io.h b/arch/sandbox/include/asm/io.h
index d8c0236..4ce7a84 100644
--- a/arch/sandbox/include/asm/io.h
+++ b/arch/sandbox/include/asm/io.h
@@ -49,3 +49,5 @@ static inline void *map_sysmem(phys_addr_t paddr, unsigned long len)
 static inline void unmap_sysmem(const void *vaddr)
 {
 }
+
+phys_addr_t map_to_sysmem(void *ptr);
diff --git a/include/common.h b/include/common.h
index cc6bf5e..d2249b1 100644
--- a/include/common.h
+++ b/include/common.h
@@ -896,6 +896,11 @@ static inline void *map_sysmem(phys_addr_t paddr, unsigned long len)
 static inline void unmap_sysmem(const void *vaddr)
 {
 }
+
+static inline phys_addr_t map_to_sysmem(void *ptr)
+{
+	return (phys_addr_t)ptr;
+}
 # endif
 
 #endif /* __ASSEMBLY__ */