From 04cbfa485be5f26777e9c2e381b474c5ff361018 Mon Sep 17 00:00:00 2001
From: Giovanni Di Sirio <gdisirio@gmail.com>
Date: Sun, 12 May 2019 15:16:55 +0000
Subject: [PATCH] Fixed bug #1029.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@12789 27425a3e-05d8-49a3-a47f-9c15f0e5edd8
---
 os/hal/ports/STM32/STM32F4xx/stm32_rcc.h | 8 ++++++++
 readme.txt                               | 2 ++
 2 files changed, 10 insertions(+)

diff --git a/os/hal/ports/STM32/STM32F4xx/stm32_rcc.h b/os/hal/ports/STM32/STM32F4xx/stm32_rcc.h
index e4eb67a2a..cc401ce05 100644
--- a/os/hal/ports/STM32/STM32F4xx/stm32_rcc.h
+++ b/os/hal/ports/STM32/STM32F4xx/stm32_rcc.h
@@ -429,14 +429,22 @@
  *
  * @api
  */
+#ifdef RCC_AHB1ENR_BKPSRAMEN
 #define rccEnableBKPSRAM(lp) rccEnableAHB1(RCC_AHB1ENR_BKPSRAMEN, lp)
+#else
+#define rccEnableBKPSRAM(lp)
+#endif
 
 /**
  * @brief   Disables the BKPSRAM peripheral clock.
  *
  * @api
  */
+#ifdef RCC_AHB1ENR_BKPSRAMEN
 #define rccDisableBKPSRAM() rccDisableAHB1(RCC_AHB1ENR_BKPSRAMEN)
+#else
+#define rccDisableBKPSRAM()
+#endif
 /** @} */
 
 /**
diff --git a/readme.txt b/readme.txt
index 9ad6c14ca..e2aa4744b 100644
--- a/readme.txt
+++ b/readme.txt
@@ -94,6 +94,8 @@
 - HAL: Added a new interface for range-finder devices (used by EX).
 - HAL: Added mcuconf.h updater tool for STM32F407 (backported to 19.1.1).
 - NIL: Integrated NIL 4.0.
+- FIX: Fixed RCC_AHB1ENR_BKPSRAMEN not present in all STMF4xx devices
+       (bug #1029)(backported to 19.1.3)(backported to 18.2.3).
 - FIX: Fixed MPU fix #1027 broke stack checking on Cortex-M devices without
        MPU (bug #1028)(backported to 19.1.3)(backported to 18.2.3).
 - FIX: Fixed MPU setup missing on thread start (bug #1027)