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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed 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.
*/
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "bootloader.h"
#define PARTITION_TABLE_SIZE 4096 // 4KB
#define BOOT_PART_LEN 0x20000 // 128KB
#define SMALL_BUFFER_SIZE 0x20
static const char* FAMILY_LOCATION = "/sys/board_properties/soc/family";
static const char* TYPE_LOCATION = "/sys/board_properties/soc/type";
unsigned int read_whole_file(const char* fname, char* buffer,
int buffer_size) {
memset(buffer, 0, buffer_size);
FILE* f = fopen(fname, "rb");
if (f == NULL) {
fprintf(stderr, "Cannot open %s!\n", fname);
return 0;
}
int read_byte_count = fread(buffer, 1, buffer_size, f);
fclose(f);
if (read_byte_count >= buffer_size) {
fprintf(stderr, "The data in %s is too large for the buffer", fname);
return 0;
}
return 1;
}
// Four different device/chip type xloaders are supported by a bootloader.img:
// 4460 EMU, 4460 HS, 4430 EMU, 4430 HS.
// The layout of the bootloader.img is:
//
// Partition table (4KB)
// 4460 EMU xloader (128KB)
// 4460 HS xloader (128KB)
// 4430 EMU xloader (128KB)
// 4430 HS xloader(128KB)
// sbl (the rest)
unsigned int get_xloader_offset() {
unsigned int offset = 0;
char* file_data = malloc(SMALL_BUFFER_SIZE);
if (file_data == NULL) {
return -1;
}
if (!read_whole_file(FAMILY_LOCATION, file_data, SMALL_BUFFER_SIZE)) {
fprintf(stderr, "Cannot read the family\n");
free(file_data);
return -1;
}
if (strncmp(file_data, "OMAP4430", 8) == 0) {
offset += (BOOT_PART_LEN * 2);
} else if (strncmp(file_data, "OMAP4460", 8) != 0) {
fprintf(stderr, "Unknown family: %s\n", file_data);
free(file_data);
return -1;
}
if (!read_whole_file(TYPE_LOCATION, file_data, SMALL_BUFFER_SIZE)) {
fprintf(stderr, "Cannot read the type\n");
free(file_data);
return -1;
}
if (strncmp(file_data, "HS", 2) == 0) {
offset += BOOT_PART_LEN;
} else if (strncmp(file_data, "EMU", 3) != 0) {
fprintf(stderr, "Unknown type: %s\n", file_data);
free(file_data);
return -1;
}
return offset;
}
int update_bootloader(const char* image_data,
size_t image_size,
const char* xloader_loc,
const char* sbl_loc) {
unsigned int xloader_offset=0;
unsigned int sbl_offset=0;
int type_family_offset = get_xloader_offset();
if (type_family_offset < 0) {
return -1;
}
// The offsets into the relevant parts of the bootloader image
xloader_offset = PARTITION_TABLE_SIZE + type_family_offset;
sbl_offset = PARTITION_TABLE_SIZE + (BOOT_PART_LEN * 4);
if (image_size < sbl_offset) {
fprintf(stderr, "image size %d is too small\n", image_size);
return -1;
}
int written = 0;
int close_status = 0;
FILE* xloader = fopen(xloader_loc, "r+b");
if (xloader == NULL) {
fprintf(stderr, "Could not open %s\n", xloader_loc);
return -1;
}
// index into the correct xloader offset
written = fwrite(image_data+xloader_offset, 1, BOOT_PART_LEN, xloader);
close_status = fclose(xloader);
if (written != BOOT_PART_LEN || close_status != 0) {
fprintf(stderr, "Failed writing to /xloader\n");
return -1;
}
unsigned int sbl_size = image_size - sbl_offset;
FILE* sbl = fopen(sbl_loc, "r+b");
if (sbl == NULL) {
fprintf(stderr, "Could not open %s\n", sbl_loc);
return -1;
}
written = fwrite(image_data+sbl_offset, 1, sbl_size, sbl);
close_status = fclose(sbl);
if (written != sbl_size || close_status != 0) {
fprintf(stderr, "Failed writing to /sbl\n");
return -1;
}
return 0;
}
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