diff --git a/os/hal/src/pal.c b/os/hal/src/pal.c
index 7bb645603..cc602caca 100644
--- a/os/hal/src/pal.c
+++ b/os/hal/src/pal.c
@@ -71,7 +71,7 @@
 ioportmask_t palReadBus(IOBus *bus) {
 
   chDbgCheck((bus != NULL) &&
-             (bus->bus_offset > PAL_IOPORTS_WIDTH), "palReadBus");
+             (bus->bus_offset < PAL_IOPORTS_WIDTH), "palReadBus");
 
   return palReadGroup(bus->bus_portid, bus->bus_mask, bus->bus_offset);
 }
@@ -96,7 +96,7 @@ ioportmask_t palReadBus(IOBus *bus) {
 void palWriteBus(IOBus *bus, ioportmask_t bits) {
 
   chDbgCheck((bus != NULL) &&
-             (bus->bus_offset > PAL_IOPORTS_WIDTH), "palWriteBus");
+             (bus->bus_offset < PAL_IOPORTS_WIDTH), "palWriteBus");
 
   palWriteGroup(bus->bus_portid, bus->bus_mask, bus->bus_offset, bits);
 }
@@ -119,7 +119,7 @@ void palWriteBus(IOBus *bus, ioportmask_t bits) {
 void palSetBusMode(IOBus *bus, uint_fast8_t mode) {
 
   chDbgCheck((bus != NULL) &&
-             (bus->bus_offset > PAL_IOPORTS_WIDTH), "palSetBusMode");
+             (bus->bus_offset < PAL_IOPORTS_WIDTH), "palSetBusMode");
 
   palSetGroupMode(bus->bus_portid, bus->bus_mask, mode);
 }
diff --git a/readme.txt b/readme.txt
index 6d162e115..6feb78802 100644
--- a/readme.txt
+++ b/readme.txt
@@ -69,6 +69,7 @@
 *****************************************************************************
 
 *** 2.2.3 ***
+- FIX: Fixed wrong checks in PAL driver (bug 3224681).
 - FIX: Fixed wrong checks in I/O Queues (bug 3219197).
 - FIX: Fixed invalid assertion in adcConvert() (bug 3205410).
 - NEW: Improved preemption implementation for the Cortex-M0, now it uses