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bu: check compatibility btw BL and HW before installing

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CC and CC3D boards share the same FW image.  This is accomplished
by checking the BOARD_REVISION field in the board_info_blob
that is stored in the BL partition in flash as we init the FW.

Make sure that the BU image only writes a BL image that has
the same BOARD_TYPE and BOARD_REVISION fields in the embedded
image as the ones currently in flash on the board.

This ensures that we never write a CC3D BL image onto a CC board
and vice versa.  This check should prevent "bricking" a board.
This commit is contained in:
Stacey Sheldon 2012-05-22 00:33:40 -04:00
parent e063bb0490
commit 3b0508e753
1 changed files with 26 additions and 0 deletions
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26
flight/Bootloaders/BootloaderUpdater/main.c
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@ -28,6 +28,7 @@
/* Bootloader Includes */
#include <pios.h>
#include <stdbool.h>
#include "pios_board_info.h"
#define MAX_WRI_RETRYS 3
/* Prototype of PIOS_Board_Init() function */
@ -56,6 +57,31 @@ int main() {
if ((0x08000000 + embedded_image_size) > base_address)
error();
///
/*
* Make sure the bootloader we're carrying is for the same
* board type and board revision as the one we're running on.
*
* Assume the bootloader in flash and the bootloader contained in
* the updater both carry a board_info_blob at the end of the image.
*/
/* Calculate how far the board_info_blob is from the beginning of the bootloader */
uint32_t board_info_blob_offset = (uint32_t)&pios_board_info_blob - (uint32_t)0x08000000;
/* Use the same offset into our embedded bootloader image */
struct pios_board_info * new_board_info_blob = (struct pios_board_info *)
((uint32_t)embedded_image_start + board_info_blob_offset);
/* Compare the two board info blobs to make sure they're for the same HW revision */
if ((pios_board_info_blob.magic != new_board_info_blob->magic) ||
(pios_board_info_blob.board_type != new_board_info_blob->board_type) ||
(pios_board_info_blob.board_rev != new_board_info_blob->board_rev)) {
error();
}
/* Embedded bootloader looks like it's the right one for this HW, proceed... */
FLASH_Unlock();
/// Bootloader memory space erase