1 /* 2 * (c) Copyright 2011 by Tigris Elektronik GmbH 3 * 4 * Author: 5 * Maximilian Schwerin <mvs@tigris.de> 6 * 7 * SPDX-License-Identifier: GPL-2.0+ 8 */ 9 10 #include <common.h> 11 12 #include <command.h> 13 #include <environment.h> 14 #include <linux/stddef.h> 15 #include <malloc.h> 16 #include <memalign.h> 17 #include <search.h> 18 #include <errno.h> 19 #include <fat.h> 20 #include <mmc.h> 21 22 #ifdef CONFIG_SPL_BUILD 23 /* TODO(sjg@chromium.org): Figure out why this is needed */ 24 # if !defined(CONFIG_TARGET_AM335X_EVM) || defined(CONFIG_SPL_OS_BOOT) 25 # define LOADENV 26 # endif 27 #else 28 # define LOADENV 29 # if defined(CONFIG_CMD_SAVEENV) 30 # define CMD_SAVEENV 31 # endif 32 #endif 33 34 env_t *env_ptr; 35 36 DECLARE_GLOBAL_DATA_PTR; 37 38 #ifdef CMD_SAVEENV 39 static int env_fat_save(void) 40 { 41 env_t env_new; 42 struct blk_desc *dev_desc = NULL; 43 disk_partition_t info; 44 int dev, part; 45 int err; 46 loff_t size; 47 48 err = env_export(&env_new); 49 if (err) 50 return err; 51 52 part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE, 53 CONFIG_ENV_FAT_DEVICE_AND_PART, 54 &dev_desc, &info, 1); 55 if (part < 0) 56 return 1; 57 58 dev = dev_desc->devnum; 59 if (fat_set_blk_dev(dev_desc, &info) != 0) { 60 printf("\n** Unable to use %s %d:%d for saveenv **\n", 61 CONFIG_ENV_FAT_INTERFACE, dev, part); 62 return 1; 63 } 64 65 err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t), 66 &size); 67 if (err == -1) { 68 printf("\n** Unable to write \"%s\" from %s%d:%d **\n", 69 CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part); 70 return 1; 71 } 72 73 puts("done\n"); 74 return 0; 75 } 76 #endif /* CMD_SAVEENV */ 77 78 #ifdef LOADENV 79 static void env_fat_load(void) 80 { 81 ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE); 82 struct blk_desc *dev_desc = NULL; 83 disk_partition_t info; 84 int dev, part; 85 int err; 86 87 part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE, 88 CONFIG_ENV_FAT_DEVICE_AND_PART, 89 &dev_desc, &info, 1); 90 if (part < 0) 91 goto err_env_relocate; 92 93 dev = dev_desc->devnum; 94 if (fat_set_blk_dev(dev_desc, &info) != 0) { 95 printf("\n** Unable to use %s %d:%d for loading the env **\n", 96 CONFIG_ENV_FAT_INTERFACE, dev, part); 97 goto err_env_relocate; 98 } 99 100 err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE); 101 if (err == -1) { 102 printf("\n** Unable to read \"%s\" from %s%d:%d **\n", 103 CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part); 104 goto err_env_relocate; 105 } 106 107 env_import(buf, 1); 108 return; 109 110 err_env_relocate: 111 set_default_env(NULL); 112 } 113 #endif /* LOADENV */ 114 115 U_BOOT_ENV_LOCATION(fat) = { 116 .location = ENVL_FAT, 117 ENV_NAME("FAT") 118 #ifdef LOADENV 119 .load = env_fat_load, 120 #endif 121 #ifdef CMD_SAVEENV 122 .save = env_save_ptr(env_fat_save), 123 #endif 124 }; 125