From 2529fb514c10513b52b283472ed6edd26f5d0fc4 Mon Sep 17 00:00:00 2001
From: Fredrik Thulin <fredrik@thulin.net>
Date: Wed, 25 May 2016 22:46:40 +0200
Subject: More DFU code. This might actually work.

The applications to be uploaded using 'dfu upload' have to have another
FLASH defined in their linker script.

Have to recompile some firmware tomorrow and test if this actually
works.
---
 .../TOOLCHAIN_GCC_ARM/STM32F429BI.ld                 | 20 +++++++++++++++-----
 .../TARGET_CRYPTECH_ALPHA/cmsis_nvic.c               |  3 +--
 .../TARGET_CRYPTECH_ALPHA/system_stm32f4xx.c         |  9 +++++++--
 3 files changed, 23 insertions(+), 9 deletions(-)

(limited to 'libraries')

diff --git a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F4/TARGET_CRYPTECH_ALPHA/TOOLCHAIN_GCC_ARM/STM32F429BI.ld b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F4/TARGET_CRYPTECH_ALPHA/TOOLCHAIN_GCC_ARM/STM32F429BI.ld
index cb19009..c78e619 100644
--- a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F4/TARGET_CRYPTECH_ALPHA/TOOLCHAIN_GCC_ARM/STM32F429BI.ld
+++ b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F4/TARGET_CRYPTECH_ALPHA/TOOLCHAIN_GCC_ARM/STM32F429BI.ld
@@ -1,19 +1,18 @@
 /* Linker script to configure memory regions. */
 MEMORY
-{ 
+{
   /* FLASH (rx) : ORIGIN = 0x08000000, LENGTH = 2048k */
   BOOTLOADER (rx) : ORIGIN = 0x08000000, LENGTH = 128K
-  FIRMWARE (rx)   : ORIGIN = 0x08100000, LENGTH = 2048K - 128K
+  FIRMWARE (rx)   : ORIGIN = 0x08000000 + 128K, LENGTH = 2048K - 128K
   FLASH (rx)   : ORIGIN = 0x08000000, LENGTH = 2048K
-  CCM (rwx) : ORIGIN = 0x10000000, LENGTH = 64K
-  RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 192K
+  RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 192K - 4
 }
 
 /* Linker script to place sections and symbol values. Should be used together
  * with other linker script that defines memory regions FLASH and RAM.
  * It references following symbols, which must be defined in code:
  *   Reset_Handler : Entry of reset handler
- * 
+ *
  * It defines following symbols, which code can use without definition:
  *   __exidx_start
  *   __exidx_end
@@ -152,6 +151,17 @@ SECTIONS
     __StackLimit = __StackTop - SIZEOF(.stack_dummy);
     PROVIDE(__stack = __StackTop);
 
+    /* The DFU code needs to know where the firmware lives */
+    CRYPTECH_BOOTLOADER_START = ORIGIN(BOOTLOADER);
+    CRYPTECH_BOOTLOADER_END = ORIGIN(BOOTLOADER) + LENGTH(BOOTLOADER) - 1;
+    CRYPTECH_FIRMWARE_START = ORIGIN(FIRMWARE);
+    CRYPTECH_FIRMWARE_END = ORIGIN(FIRMWARE) + LENGTH(FIRMWARE) - 1;
+    /* The last 4 bytes of RAM is used to control the DFU reset+jumping.
+     * Have to be reserved in here to not get overwritten by the Reset_Handler
+     * that zeros memory. Maybe there is a better way?
+     */
+    CRYPTECH_DFU_CONTROL = ORIGIN(RAM) + LENGTH(RAM);
+
     /* Check if data + heap + stack exceeds RAM limit */
     ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed with stack")
 }
diff --git a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F4/TARGET_CRYPTECH_ALPHA/cmsis_nvic.c b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F4/TARGET_CRYPTECH_ALPHA/cmsis_nvic.c
index ac2c92a..2da63fc 100644
--- a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F4/TARGET_CRYPTECH_ALPHA/cmsis_nvic.c
+++ b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F4/TARGET_CRYPTECH_ALPHA/cmsis_nvic.c
@@ -38,8 +38,7 @@ void NVIC_SetVector(IRQn_Type IRQn, uint32_t vector) {
     uint32_t i;
 
     // Copy and switch to dynamic vectors if the first time called
-    if (SCB->VTOR == NVIC_FLASH_VECTOR_ADDRESS ||
-	SCB->VTOR == 0x08100000) {
+    if (SCB->VTOR == NVIC_FLASH_VECTOR_ADDRESS) {
         uint32_t *old_vectors = vectors;
         vectors = (uint32_t*)NVIC_RAM_VECTOR_ADDRESS;
         for (i=0; i<NVIC_NUM_VECTORS; i++) {
diff --git a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F4/TARGET_CRYPTECH_ALPHA/system_stm32f4xx.c b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F4/TARGET_CRYPTECH_ALPHA/system_stm32f4xx.c
index c2816d0..cc527ae 100644
--- a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F4/TARGET_CRYPTECH_ALPHA/system_stm32f4xx.c
+++ b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F4/TARGET_CRYPTECH_ALPHA/system_stm32f4xx.c
@@ -75,6 +75,8 @@
   #define HSI_VALUE    ((uint32_t)16000000) /*!< Value of the Internal oscillator in Hz*/
 #endif /* HSI_VALUE */
 
+extern uint32_t CRYPTECH_FIRMWARE_START;  /* defined in the linker script (STM32F429BI.ld) */
+
 /**
   * @}
   */
@@ -197,11 +199,14 @@ void SystemInit(void)
 #endif /* DATA_IN_ExtSRAM || DATA_IN_ExtSDRAM */
 
   /* Configure the Vector Table location add offset address ------------------*/
+  /* cryptech: Don't change VTOR if it is already set up by the bootloader */
+  if (SCB->VTOR != CRYPTECH_FIRMWARE_START) {
 #ifdef VECT_TAB_SRAM
-  SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM */
+      SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM */
 #else
-  SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH */
+      SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH */
 #endif
+  }
 
   /* Configure the Cube driver */
   SystemCoreClock = 16000000; // At this stage the HSI is used as system clock
-- 
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