diff --git a/cpu/lpc23xx/ldscripts/lpc23xx.ld b/cpu/lpc23xx/ldscripts/lpc23xx.ld
index 53156e7c8f..48c5e91f9e 100644
--- a/cpu/lpc23xx/ldscripts/lpc23xx.ld
+++ b/cpu/lpc23xx/ldscripts/lpc23xx.ld
@@ -204,6 +204,10 @@ SECTIONS
     _sram = ORIGIN(ram);
     _eram = ORIGIN(ram) + LENGTH(ram);
 
+    /* Populate information about rom size */
+    _srom = ORIGIN(rom);
+    _erom = ORIGIN(rom) + LENGTH(rom);
+
     .heap1 ALIGN(4) (NOLOAD) :
     {
         _sheap1 = ORIGIN(ram_ethernet);
@@ -243,4 +247,8 @@ SECTIONS
         _sheap3 = . ;
         _eheap3 = ORIGIN(ram_battery) + LENGTH(ram_battery);
     } > ram_battery
+
+    .end_fw (NOLOAD) : ALIGN(4) {
+        _end_fw = . ;
+    } > rom
 }
diff --git a/cpu/lpc23xx/periph/flashpage.c b/cpu/lpc23xx/periph/flashpage.c
index d35ceedcaa..80bb7c676d 100644
--- a/cpu/lpc23xx/periph/flashpage.c
+++ b/cpu/lpc23xx/periph/flashpage.c
@@ -34,6 +34,13 @@
 typedef void (*IAP)(unsigned int[], unsigned int[]);
 static const IAP IAP_Entry = (IAP)0x7ffffff1;
 
+/**
+ * @brief   Memory markers, defined in the linker script
+ * @{
+ */
+extern uint32_t _end_fw;
+extern uint32_t _erom;
+
 static uint32_t iap(uint32_t code, uint32_t p1, uint32_t p2, uint32_t p3, uint32_t p4)
 {
     /* contains parameters for IAP command */
@@ -251,3 +258,13 @@ void flashpage_write(void *target_addr, const void *data, size_t len)
         DEBUG("ERROR: COPY_RAM_TO_FLASH: %u\n", err);
     }
 }
+
+unsigned flashpage_first_free(void)
+{
+    return flashpage_page(&_end_fw) + 1;
+}
+
+unsigned flashpage_last_free(void)
+{
+    return flashpage_page(&_erom) - 1;
+}