diff options
| -rw-r--r-- | doc/android/fastboot.rst | 19 | ||||
| -rw-r--r-- | drivers/fastboot/fb_mmc.c | 75 |
2 files changed, 85 insertions, 9 deletions
diff --git a/doc/android/fastboot.rst b/doc/android/fastboot.rst index de3f6c37d7..2877c3cbaa 100644 --- a/doc/android/fastboot.rst +++ b/doc/android/fastboot.rst @@ -85,6 +85,25 @@ for example:: fastboot_partition_alias_boot=LNX +Raw partition descriptors +^^^^^^^^^^^^^^^^^^^^^^^^^ + +In cases where no partition table is present, a raw partition descriptor can be +defined, specifying the offset, size, and optionally the MMC hardware partition +number for a given partition name. + +This is useful when using fastboot to flash files (e.g. SPL or U-Boot) to a +specific offset in the eMMC boot partition, without having to update the entire +boot partition. + +To define a raw partition descriptor, add an environment variable similar to:: + + fastboot_raw_partition_<raw partition name>=<offset> <size> [mmcpart <num>] + +for example:: + + fastboot_raw_partition_boot=0x100 0x1f00 mmcpart 1 + Variable overrides ^^^^^^^^^^^^^^^^^^ diff --git a/drivers/fastboot/fb_mmc.c b/drivers/fastboot/fb_mmc.c index b2f8932e1c..ae8e8e512f 100644 --- a/drivers/fastboot/fb_mmc.c +++ b/drivers/fastboot/fb_mmc.c @@ -50,6 +50,48 @@ static int part_get_info_by_name_or_alias(struct blk_desc *dev_desc, return ret; } +static int raw_part_get_info_by_name(struct blk_desc *dev_desc, + const char *name, struct disk_partition *info, int *mmcpart) +{ + /* strlen("fastboot_raw_partition_") + PART_NAME_LEN + 1 */ + char env_desc_name[23 + PART_NAME_LEN + 1]; + char *raw_part_desc; + const char *argv[2]; + const char **parg = argv; + + /* check for raw partition descriptor */ + strcpy(env_desc_name, "fastboot_raw_partition_"); + strncat(env_desc_name, name, PART_NAME_LEN); + raw_part_desc = strdup(env_get(env_desc_name)); + if (raw_part_desc == NULL) + return -ENODEV; + + /* + * parse partition descriptor + * + * <lba_start> <lba_size> [mmcpart <num>] + */ + for (; parg < argv + sizeof(argv) / sizeof(*argv); ++parg) { + *parg = strsep(&raw_part_desc, " "); + if (*parg == NULL) { + pr_err("Invalid number of arguments.\n"); + return -ENODEV; + } + } + + info->start = simple_strtoul(argv[0], NULL, 0); + info->size = simple_strtoul(argv[1], NULL, 0); + info->blksz = dev_desc->blksz; + strncpy((char *)info->name, name, PART_NAME_LEN); + + if (raw_part_desc) { + if (strcmp(strsep(&raw_part_desc, " "), "mmcpart") == 0) + *mmcpart = simple_strtoul(raw_part_desc, NULL, 0); + } + + return 0; +} + /** * fb_mmc_blk_write() - Write/erase MMC in chunks of FASTBOOT_MAX_BLK_WRITE * @@ -376,7 +418,8 @@ int fastboot_mmc_get_part_info(const char *part_name, struct blk_desc **dev_desc, struct disk_partition *part_info, char *response) { - int r; + int r = 0; + int mmcpart; *dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV); if (!*dev_desc) { @@ -388,10 +431,12 @@ int fastboot_mmc_get_part_info(const char *part_name, return -ENOENT; } - r = part_get_info_by_name_or_alias(*dev_desc, part_name, part_info); - if (r < 0) { - fastboot_fail("partition not found", response); - return r; + if (raw_part_get_info_by_name(*dev_desc, part_name, part_info, &mmcpart) < 0) { + r = part_get_info_by_name_or_alias(*dev_desc, part_name, part_info); + if (r < 0) { + fastboot_fail("partition not found", response); + return r; + } } return r; @@ -410,6 +455,7 @@ void fastboot_mmc_flash_write(const char *cmd, void *download_buffer, { struct blk_desc *dev_desc; struct disk_partition info; + int mmcpart = 0; dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV); if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) { @@ -482,7 +528,13 @@ void fastboot_mmc_flash_write(const char *cmd, void *download_buffer, } #endif - if (part_get_info_by_name_or_alias(dev_desc, cmd, &info) < 0) { + if (raw_part_get_info_by_name(dev_desc, cmd, &info, &mmcpart) == 0) { + if (blk_dselect_hwpart(dev_desc, mmcpart)) { + pr_err("Failed to select hwpart\n"); + fastboot_fail("Failed to select hwpart", response); + return; + } + } else if (part_get_info_by_name_or_alias(dev_desc, cmd, &info) < 0) { pr_err("cannot find partition: '%s'\n", cmd); fastboot_fail("cannot find partition", response); return; @@ -524,11 +576,11 @@ void fastboot_mmc_flash_write(const char *cmd, void *download_buffer, */ void fastboot_mmc_erase(const char *cmd, char *response) { - int ret; struct blk_desc *dev_desc; struct disk_partition info; lbaint_t blks, blks_start, blks_size, grp_size; struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV); + int mmcpart = 0; if (mmc == NULL) { pr_err("invalid mmc device\n"); @@ -562,8 +614,13 @@ void fastboot_mmc_erase(const char *cmd, char *response) } #endif - ret = part_get_info_by_name_or_alias(dev_desc, cmd, &info); - if (ret < 0) { + if (raw_part_get_info_by_name(dev_desc, cmd, &info, &mmcpart) == 0) { + if (blk_dselect_hwpart(dev_desc, mmcpart)) { + pr_err("Failed to select hwpart\n"); + fastboot_fail("Failed to select hwpart", response); + return; + } + } else if (part_get_info_by_name_or_alias(dev_desc, cmd, &info) < 0) { pr_err("cannot find partition: '%s'\n", cmd); fastboot_fail("cannot find partition", response); return; |