diff --git a/flashprog.c b/flashprog.c
index 687d379..e4151da 100644
--- a/flashprog.c
+++ b/flashprog.c
@@ -661,6 +661,9 @@
 		if (flash->chip->probe(flash) != 1)
 			goto notfound;
 
+		if (flash->chip->prepare_access && flash->chip->prepare_access(flash, PREPARE_POST_PROBE))
+			goto notfound;
+
 		/* If this is the first chip found, accept it.
 		 * If this is not the first chip found, accept it only if it is
 		 * a non-generic match. SFDP and CFI are generic matches.
diff --git a/include/flash.h b/include/flash.h
index 4304bb8..b3ad235 100644
--- a/include/flash.h
+++ b/include/flash.h
@@ -238,6 +238,7 @@
 
 enum preparation_steps {
 	PREPARE_PROBE,
+	PREPARE_POST_PROBE,
 	PREPARE_FULL,
 };
 
diff --git a/memory_bus.c b/memory_bus.c
index 8badfda..b9cd68c 100644
--- a/memory_bus.c
+++ b/memory_bus.c
@@ -46,6 +46,9 @@
 
 int prepare_memory_access(struct flashctx *flash, enum preparation_steps prep)
 {
+	if (prep == PREPARE_POST_PROBE)
+		return 0;
+
 	/* Init pointers to the fail-safe state to distinguish them later from legit values. */
 	flash->virtual_memory = (chipaddr)ERROR_PTR;
 	flash->virtual_registers = (chipaddr)ERROR_PTR;
@@ -66,6 +69,9 @@
 
 int prepare_memory_register_access(struct flashctx *flash, enum preparation_steps prep)
 {
+	if (prep == PREPARE_POST_PROBE)
+		return 0;
+
 	if (prepare_memory_access(flash, prep))
 		return 1;