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