diff --git a/cmd/sf.c b/cmd/sf.c
index f43a2e08b31..08e364e1914 100644
--- a/cmd/sf.c
+++ b/cmd/sf.c
@@ -10,6 +10,7 @@
 #include <div64.h>
 #include <dm.h>
 #include <log.h>
+#include <lmb.h>
 #include <malloc.h>
 #include <mapmem.h>
 #include <spi.h>
@@ -317,6 +318,13 @@ static int do_spi_flash_read_write(int argc, char *const argv[])
 			strncmp(argv[0], "write", 5) == 0) {
 		int read;
 
+		if (CONFIG_IS_ENABLED(LMB)) {
+			if (lmb_read_check(addr, len)) {
+				printf("ERROR: trying to overwrite reserved memory...\n");
+				return CMD_RET_FAILURE;
+			}
+		}
+
 		read = strncmp(argv[0], "read", 4) == 0;
 		if (read)
 			ret = spi_flash_read(flash, offset, len, buf);
diff --git a/include/lmb.h b/include/lmb.h
index fc2daaa7bfc..aee2f9fcdaa 100644
--- a/include/lmb.h
+++ b/include/lmb.h
@@ -111,6 +111,11 @@ struct lmb *lmb_get(void);
 int lmb_push(struct lmb *store);
 void lmb_pop(struct lmb *store);
 
+static inline int lmb_read_check(phys_addr_t addr, phys_size_t len)
+{
+	return lmb_alloc_addr(addr, len) == addr ? 0 : -1;
+}
+
 #endif /* __KERNEL__ */
 
 #endif /* _LINUX_LMB_H */