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DFU: only boot the application if it has a valid start

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This commit is contained in:
Kévin Redon
2018-06-17 22:35:17 +02:00
parent 41d01b9d54
commit 3f8a4c28e8
1 changed files with 14 additions and 3 deletions
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17
firmware/libboard/common/source/board_cstartup_gnu.c
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@@ -159,9 +159,20 @@ void ResetException( void )
* not initialized yet */ * not initialized yet */
g_dfu = &_g_dfu; g_dfu = &_g_dfu;
if ((g_dfu->magic != USB_DFU_MAGIC) && !USBDFU_OverrideEnterDFU()) { if ((g_dfu->magic != USB_DFU_MAGIC) && !USBDFU_OverrideEnterDFU()) {
BootIntoApp(); /* start application if valid
/* Infinite loop */ * the application starts with the vector table
while ( 1 ) ; * the first entry in the vector table is the initial stack pointer (SP) address
* the stack will be placed in RAM, which begins at 0x2000 0000
* there is up to 48 KB of RAM (0xc000)
* since the stack grown "downwards" it should start at the end of the RAM: max 0x2000 c000
* if the SP is not in this range (e.g. flash has been erased) there is no valid application
* the second entry in the vector table is the reset address, corresponding to the application start
*/
if (((*((uint32_t*)(IFLASH_ADDR+BOARD_DFU_BOOT_SIZE)))&0xFFFF0000)==0x20000000) {
BootIntoApp();
/* Infinite loop */
while ( 1 ) ;
}
} }
#endif #endif