From f116a78de85940709225467d4cb58768d7051aeb Mon Sep 17 00:00:00 2001
From: chrysn <chrysn@fsfe.org>
Date: Fri, 27 Sep 2024 10:39:16 +0200
Subject: [PATCH] doc: Clarify that our CPU ID is not ARM's CPUID

---
 drivers/include/periph/cpuid.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/include/periph/cpuid.h b/drivers/include/periph/cpuid.h
index 6f6af2dedf..8e5522ac3f 100644
--- a/drivers/include/periph/cpuid.h
+++ b/drivers/include/periph/cpuid.h
@@ -13,6 +13,10 @@
  *
  * Provides access the CPU's serial number
  *
+ * @note This is *distinct* from what is called CPUID in ARM CPUs (which only
+ * covers variation down to silicon revisions, not down to individual instances
+ * of a CPU).
+ *
  * # (Low-) Power Implications
  *
  * The implementation **should** make sure, that calling cpuid_get() does not