<p><b>@kaspar030</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11181#discussion_r265782679">sys/include/riotboot/flashwrite.h</a>:</p>
<pre style='color:#555'>> +} riotboot_flashwrite_t;
+
+/**
+ * @brief Amount of bytes to skip at initial write of first page
+ */
+#define RIOTBOOT_FLASHWRITE_SKIPLEN 4
+
+/**
+ * @brief   Initialize firmware update (raw version)
+ *
+ * Allows setting the initial offset to @p offset, which would mean that the
+ * first bytes passed in via @ref riotboot_flashwrite_putbytes() will be
+ * written to (slot_start + offset).
+ *
+ * @note offset *should* be <= FLASHPAGE_SIZE, otherwise the results are
+ *       undefined.
</pre>
<p>yup, added.</p>

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