105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
/*
|
|
* Licensed to the Apache Software Foundation (ASF) under one
|
|
* or more contributor license agreements. See the NOTICE file
|
|
* distributed with this work for additional information
|
|
* regarding copyright ownership. The ASF licenses this file
|
|
* to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance
|
|
* with the License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing,
|
|
* software distributed under the License is distributed on an
|
|
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
|
* KIND, either express or implied. See the License for the
|
|
* specific language governing permissions and limitations
|
|
* under the License.
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* @brief Legacy flash fallbacks
|
|
*
|
|
* This file contains hacks for flash drivers without page layout
|
|
* support. They're hacks because they guess a page layout that may be
|
|
* incorrect, but is likely to "work". Needless to say, such guesswork
|
|
* is undesirable in trusted bootloader code.
|
|
*
|
|
* The behavior is:
|
|
*
|
|
* - If FLASH_AREA_IMAGE_SECTOR_SIZE is defined (this was used by
|
|
* older Zephyr ports), the image sectors have uniform sector sizes.
|
|
* We also assume that's the size of the scratch sectors.
|
|
*
|
|
* - Otherwise, we assume that the size of the entire scratch area is
|
|
* a least common multiple of all sector sizes, and use that as
|
|
* FLASH_AREA_IMAGE_SECTOR_SIZE.
|
|
*/
|
|
|
|
#include "bootutil/bootutil_log.h"
|
|
|
|
#include <flash_map_backend/flash_map_backend.h>
|
|
#include <inttypes.h>
|
|
#include <target.h>
|
|
|
|
#warning "The flash driver lacks page layout support; falling back on hacks."
|
|
|
|
#if !defined(FLASH_AREA_IMAGE_SECTOR_SIZE)
|
|
#define FLASH_AREA_IMAGE_SECTOR_SIZE FLASH_AREA_IMAGE_SCRATCH_SIZE
|
|
#endif
|
|
|
|
BOOT_LOG_MODULE_DECLARE(mcuboot);
|
|
|
|
/*
|
|
* Lookup the sector map for a given flash area. This should fill in
|
|
* `ret` with all of the sectors in the area. `*cnt` will be set to
|
|
* the storage at `ret` and should be set to the final number of
|
|
* sectors in this area.
|
|
*/
|
|
int flash_area_get_sectors(int idx, uint32_t *cnt, struct flash_sector *ret)
|
|
{
|
|
const struct flash_area *fa;
|
|
uint32_t max_cnt = *cnt;
|
|
uint32_t rem_len;
|
|
int rc = -1;
|
|
|
|
if (flash_area_open(idx, &fa)) {
|
|
goto out;
|
|
}
|
|
|
|
BOOT_LOG_DBG("area %d: offset=0x%x, length=0x%x", idx, fa->fa_off,
|
|
fa->fa_size);
|
|
|
|
if (*cnt < 1) {
|
|
goto fa_close_out;
|
|
}
|
|
|
|
rem_len = fa->fa_size;
|
|
*cnt = 0;
|
|
while (rem_len > 0 && *cnt < max_cnt) {
|
|
if (rem_len < FLASH_AREA_IMAGE_SECTOR_SIZE) {
|
|
BOOT_LOG_ERR("area %d size 0x%x not divisible by sector size 0x%x",
|
|
idx, fa->fa_size, FLASH_AREA_IMAGE_SECTOR_SIZE);
|
|
goto fa_close_out;
|
|
}
|
|
|
|
ret[*cnt].fs_off = FLASH_AREA_IMAGE_SECTOR_SIZE * (*cnt);
|
|
ret[*cnt].fs_size = FLASH_AREA_IMAGE_SECTOR_SIZE;
|
|
*cnt = *cnt + 1;
|
|
rem_len -= FLASH_AREA_IMAGE_SECTOR_SIZE;
|
|
}
|
|
|
|
if (*cnt >= max_cnt) {
|
|
BOOT_LOG_ERR("flash area %d sector count overflow", idx);
|
|
goto fa_close_out;
|
|
}
|
|
|
|
rc = 0;
|
|
|
|
fa_close_out:
|
|
flash_area_close(fa);
|
|
out:
|
|
return rc;
|
|
}
|