<p></p>
<p><b>@Ollrogge</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16489#discussion_r697245560">sys/include/fido2/ctap/ctap_mem.h</a>:</p>
<pre style='color:#555'>> +#ifndef FIDO2_CTAP_CTAP_MEM_H
+#define FIDO2_CTAP_CTAP_MEM_H
+
+#include <stdint.h>
+
+#include "fido2/ctap/ctap.h"
+#include "periph/flashpage.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Start page for storing resident keys
+ */
+#define CTAP_FLASH_RK_START_PAGE 15U
</pre>
<p>This was determined based on the characteristics of the <code>nrf52840dk</code> so it is kind of arbitrary right now. I have not found a way to dynamically determine the first writable flashpage after the firmware. Is there one ? If yes could you point me towards it?</p>

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