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cc2538: Add header file for flash CCA page and use it

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Create a dedicated header file with all the definitions for the flash lock bit
page and customer configuration area. This avoids duplicating those definitions
in the startup-gcc.c files of all CC2538-based platforms, and this also allows
to easily manipulate the CCA from outside startup-gcc.c (e.g. for on-the-air
firmware update).

The definitions are now complete contrary to what was in startup-gcc.c:
 - Definitions have been added to select the bootloader backdoor pin and active
   level if enabled.
 - Definitions have been added to access the page and debug lock bits. The debug
   lock bit can be used to prevent someone from reading back a programmed
   firmware through JTAG if the firmware binary image has to be confidential,
   which should be combined with a disabled bootloader backdoor.
 - The application entry point is now tied to the beginning of the .text section
   instead of to the beginning of the flash. This allows projects using custom
   linker scripts to place the application entry point anywhere in the flash,
   which can be useful e.g. for on-the-air firmware update.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
This commit is contained in:
Benoît Thébaudeau 2013-11-27 21:55:18 +01:00
parent 65806f53eb
commit a2686e581e
3 changed files with 106 additions and 18 deletions
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29
platform/cc2538dk/startup-gcc.c
View file

@ -38,13 +38,11 @@
*/
#include "contiki.h"
#include "reg.h"
#include "flash-cca.h"
#include "sys-ctrl.h"
#include "uart.h"
#include <stdint.h>
#define FLASH_START_ADDR 0x00200000
#define BOOTLOADER_BACKDOOR_DISABLE 0xEFFFFFFF
/*---------------------------------------------------------------------------*/
extern int main(void);
/*---------------------------------------------------------------------------*/
@ -92,22 +90,19 @@ void uart_isr(void);
/* Allocate stack space */
static unsigned long stack[512];
/*---------------------------------------------------------------------------*/
/*
* Customer Configuration Area in the Lock Page
* Holds Image Vector table address (bytes 2012 - 2015) and
* Image Valid bytes (bytes 2008 -2011)
*/
typedef struct {
unsigned long bootldr_cfg;
unsigned long image_valid;
unsigned long image_vector_addr;
} lock_page_cca_t;
/* Linker construct indicating .text section location */
extern uint8_t _text[0];
/*---------------------------------------------------------------------------*/
__attribute__ ((section(".flashcca"), used))
const lock_page_cca_t __cca = {
BOOTLOADER_BACKDOOR_DISABLE, /* Bootloader backdoor disabled */
0, /* Image valid bytes */
FLASH_START_ADDR /* Vector table located at the start of flash */
const flash_cca_lock_page_t __cca = {
FLASH_CCA_BOOTLDR_CFG_DISABLE, /* Bootloader backdoor disabled */
FLASH_CCA_IMAGE_VALID, /* Image valid */
&_text, /* Vector table located at the start of .text */
/* Unlock all pages and debug */
{ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }
};
/*---------------------------------------------------------------------------*/
__attribute__ ((section(".vectors"), used))