2 * Copyright 2014 Broadcom Corporation.
4 * SPDX-License-Identifier: GPL-2.0+
12 #include <image-sparse.h>
16 #include <linux/compat.h>
17 #include <android_image.h>
20 * FIXME: Ensure we always set these names via Kconfig once xxx_PARTITION is
23 #ifndef CONFIG_FASTBOOT_GPT_NAME
24 #define CONFIG_FASTBOOT_GPT_NAME "gpt"
28 #ifndef CONFIG_FASTBOOT_MBR_NAME
29 #define CONFIG_FASTBOOT_MBR_NAME "mbr"
32 #define BOOT_PARTITION_NAME "boot"
34 struct fb_mmc_sparse {
35 struct blk_desc *dev_desc;
38 static int part_get_info_by_name_or_alias(struct blk_desc *dev_desc,
39 const char *name, disk_partition_t *info)
43 ret = part_get_info_by_name(dev_desc, name, info);
45 /* strlen("fastboot_partition_alias_") + 32(part_name) + 1 */
46 char env_alias_name[25 + 32 + 1];
47 char *aliased_part_name;
50 strcpy(env_alias_name, "fastboot_partition_alias_");
51 strncat(env_alias_name, name, 32);
52 aliased_part_name = env_get(env_alias_name);
53 if (aliased_part_name != NULL)
54 ret = part_get_info_by_name(dev_desc,
55 aliased_part_name, info);
60 static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
61 lbaint_t blk, lbaint_t blkcnt, const void *buffer)
63 struct fb_mmc_sparse *sparse = info->priv;
64 struct blk_desc *dev_desc = sparse->dev_desc;
66 return blk_dwrite(dev_desc, blk, blkcnt, buffer);
69 static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
70 lbaint_t blk, lbaint_t blkcnt)
75 static void write_raw_image(struct blk_desc *dev_desc, disk_partition_t *info,
76 const char *part_name, void *buffer,
77 unsigned int download_bytes)
82 /* determine number of blocks to write */
83 blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
84 blkcnt = lldiv(blkcnt, info->blksz);
86 if (blkcnt > info->size) {
87 error("too large for partition: '%s'\n", part_name);
88 fastboot_fail("too large for partition");
92 puts("Flashing Raw Image\n");
94 blks = blk_dwrite(dev_desc, info->start, blkcnt, buffer);
96 error("failed writing to device %d\n", dev_desc->devnum);
97 fastboot_fail("failed writing to device");
101 printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
106 #ifdef CONFIG_ANDROID_BOOT_IMAGE
108 * Read Android boot image header from boot partition.
110 * @param[in] dev_desc MMC device descriptor
111 * @param[in] info Boot partition info
112 * @param[out] hdr Where to store read boot image header
114 * @return Boot image header sectors count or 0 on error
116 static lbaint_t fb_mmc_get_boot_header(struct blk_desc *dev_desc,
117 disk_partition_t *info,
118 struct andr_img_hdr *hdr)
120 ulong sector_size; /* boot partition sector size */
121 lbaint_t hdr_sectors; /* boot image header sectors count */
124 /* Calculate boot image sectors count */
125 sector_size = info->blksz;
126 hdr_sectors = DIV_ROUND_UP(sizeof(struct andr_img_hdr), sector_size);
127 if (hdr_sectors == 0) {
128 error("invalid number of boot sectors: 0");
129 fastboot_fail("invalid number of boot sectors: 0");
133 /* Read the boot image header */
134 res = blk_dread(dev_desc, info->start, hdr_sectors, (void *)hdr);
135 if (res != hdr_sectors) {
136 error("cannot read header from boot partition");
137 fastboot_fail("cannot read header from boot partition");
141 /* Check boot header magic string */
142 res = android_image_check_header(hdr);
144 error("bad boot image magic");
145 fastboot_fail("boot partition not initialized");
153 * Write downloaded zImage to boot partition and repack it properly.
155 * @param dev_desc MMC device descriptor
156 * @param download_buffer Address to fastboot buffer with zImage in it
157 * @param download_bytes Size of fastboot buffer, in bytes
159 * @return 0 on success or -1 on error
161 static int fb_mmc_update_zimage(struct blk_desc *dev_desc,
162 void *download_buffer,
163 unsigned int download_bytes)
165 uintptr_t hdr_addr; /* boot image header address */
166 struct andr_img_hdr *hdr; /* boot image header */
167 lbaint_t hdr_sectors; /* boot image header sectors */
169 u32 ramdisk_sector_start;
171 u32 kernel_sector_start;
173 u32 sectors_per_page;
174 disk_partition_t info;
177 puts("Flashing zImage\n");
179 /* Get boot partition info */
180 res = part_get_info_by_name(dev_desc, BOOT_PARTITION_NAME, &info);
182 error("cannot find boot partition");
183 fastboot_fail("cannot find boot partition");
187 /* Put boot image header in fastboot buffer after downloaded zImage */
188 hdr_addr = (uintptr_t)download_buffer + ALIGN(download_bytes, PAGE_SIZE);
189 hdr = (struct andr_img_hdr *)hdr_addr;
191 /* Read boot image header */
192 hdr_sectors = fb_mmc_get_boot_header(dev_desc, &info, hdr);
193 if (hdr_sectors == 0) {
194 error("unable to read boot image header");
195 fastboot_fail("unable to read boot image header");
199 /* Check if boot image has second stage in it (we don't support it) */
200 if (hdr->second_size > 0) {
201 error("moving second stage is not supported yet");
202 fastboot_fail("moving second stage is not supported yet");
206 /* Extract ramdisk location */
207 sectors_per_page = hdr->page_size / info.blksz;
208 ramdisk_sector_start = info.start + sectors_per_page;
209 ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
211 ramdisk_sectors = DIV_ROUND_UP(hdr->ramdisk_size, hdr->page_size) *
214 /* Read ramdisk and put it in fastboot buffer after boot image header */
215 ramdisk_buffer = (u8 *)hdr + (hdr_sectors * info.blksz);
216 res = blk_dread(dev_desc, ramdisk_sector_start, ramdisk_sectors,
218 if (res != ramdisk_sectors) {
219 error("cannot read ramdisk from boot partition");
220 fastboot_fail("cannot read ramdisk from boot partition");
224 /* Write new kernel size to boot image header */
225 hdr->kernel_size = download_bytes;
226 res = blk_dwrite(dev_desc, info.start, hdr_sectors, (void *)hdr);
228 error("cannot writeback boot image header");
229 fastboot_fail("cannot write back boot image header");
233 /* Write the new downloaded kernel */
234 kernel_sector_start = info.start + sectors_per_page;
235 kernel_sectors = DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
237 res = blk_dwrite(dev_desc, kernel_sector_start, kernel_sectors,
240 error("cannot write new kernel");
241 fastboot_fail("cannot write new kernel");
245 /* Write the saved ramdisk back */
246 ramdisk_sector_start = info.start + sectors_per_page;
247 ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
249 res = blk_dwrite(dev_desc, ramdisk_sector_start, ramdisk_sectors,
252 error("cannot write back original ramdisk");
253 fastboot_fail("cannot write back original ramdisk");
257 puts("........ zImage was updated in boot partition\n");
263 void fb_mmc_flash_write(const char *cmd, void *download_buffer,
264 unsigned int download_bytes)
266 struct blk_desc *dev_desc;
267 disk_partition_t info;
269 dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
270 if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
271 error("invalid mmc device\n");
272 fastboot_fail("invalid mmc device");
276 #if CONFIG_IS_ENABLED(EFI_PARTITION)
277 if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
278 printf("%s: updating MBR, Primary and Backup GPT(s)\n",
280 if (is_valid_gpt_buf(dev_desc, download_buffer)) {
281 printf("%s: invalid GPT - refusing to write to flash\n",
283 fastboot_fail("invalid GPT partition");
286 if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
287 printf("%s: writing GPT partitions failed\n", __func__);
288 fastboot_fail("writing GPT partitions failed");
291 printf("........ success\n");
297 #if CONFIG_IS_ENABLED(DOS_PARTITION)
298 if (strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME) == 0) {
299 printf("%s: updating MBR\n", __func__);
300 if (is_valid_dos_buf(download_buffer)) {
301 printf("%s: invalid MBR - refusing to write to flash\n",
303 fastboot_fail("invalid MBR partition");
306 if (write_mbr_partition(dev_desc, download_buffer)) {
307 printf("%s: writing MBR partition failed\n", __func__);
308 fastboot_fail("writing MBR partition failed");
311 printf("........ success\n");
317 #ifdef CONFIG_ANDROID_BOOT_IMAGE
318 if (strncasecmp(cmd, "zimage", 6) == 0) {
319 fb_mmc_update_zimage(dev_desc, download_buffer, download_bytes);
324 if (part_get_info_by_name_or_alias(dev_desc, cmd, &info) < 0) {
325 error("cannot find partition: '%s'\n", cmd);
326 fastboot_fail("cannot find partition");
330 if (is_sparse_image(download_buffer)) {
331 struct fb_mmc_sparse sparse_priv;
332 struct sparse_storage sparse;
334 sparse_priv.dev_desc = dev_desc;
336 sparse.blksz = info.blksz;
337 sparse.start = info.start;
338 sparse.size = info.size;
339 sparse.write = fb_mmc_sparse_write;
340 sparse.reserve = fb_mmc_sparse_reserve;
342 printf("Flashing sparse image at offset " LBAFU "\n",
345 sparse.priv = &sparse_priv;
346 write_sparse_image(&sparse, cmd, download_buffer,
349 write_raw_image(dev_desc, &info, cmd, download_buffer,
354 void fb_mmc_erase(const char *cmd)
357 struct blk_desc *dev_desc;
358 disk_partition_t info;
359 lbaint_t blks, blks_start, blks_size, grp_size;
360 struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
363 error("invalid mmc device");
364 fastboot_fail("invalid mmc device");
368 dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
369 if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
370 error("invalid mmc device");
371 fastboot_fail("invalid mmc device");
375 ret = part_get_info_by_name_or_alias(dev_desc, cmd, &info);
377 error("cannot find partition: '%s'", cmd);
378 fastboot_fail("cannot find partition");
382 /* Align blocks to erase group size to avoid erasing other partitions */
383 grp_size = mmc->erase_grp_size;
384 blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
385 if (info.size >= grp_size)
386 blks_size = (info.size - (blks_start - info.start)) &
391 printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
392 blks_start, blks_start + blks_size);
394 blks = blk_derase(dev_desc, blks_start, blks_size);
395 if (blks != blks_size) {
396 error("failed erasing from device %d", dev_desc->devnum);
397 fastboot_fail("failed erasing from device");
401 printf("........ erased " LBAFU " bytes from '%s'\n",
402 blks_size * info.blksz, cmd);