1 /* 2 * (C) Copyright 2015 3 * Linus Walleij, Linaro 4 * 5 * Support for ARM Flash Partitions 6 * 7 * SPDX-License-Identifier: GPL-2.0+ 8 */ 9 #include <common.h> 10 #include <command.h> 11 #include <console.h> 12 #include <asm/io.h> 13 14 #define MAX_REGIONS 4 15 #define MAX_IMAGES 32 16 17 struct afs_region { 18 u32 load_address; 19 u32 size; 20 u32 offset; 21 }; 22 23 struct afs_image { 24 flash_info_t *flinfo; 25 const char *name; 26 u32 version; 27 u32 entrypoint; 28 u32 attributes; 29 u32 region_count; 30 struct afs_region regions[MAX_REGIONS]; 31 ulong flash_mem_start; 32 ulong flash_mem_end; 33 }; 34 35 static struct afs_image afs_images[MAX_IMAGES]; 36 static int num_afs_images; 37 38 static u32 compute_crc(ulong start, u32 len) 39 { 40 u32 sum = 0; 41 int i; 42 43 if (len % 4 != 0) { 44 printf("bad checksumming\n"); 45 return 0; 46 } 47 48 for (i = 0; i < len; i += 4) { 49 u32 val; 50 51 val = readl((void *)start + i); 52 if (val > ~sum) 53 sum++; 54 sum += val; 55 } 56 return ~sum; 57 } 58 59 static void parse_bank(ulong bank) 60 { 61 int i; 62 ulong flstart, flend; 63 flash_info_t *info; 64 65 info = &flash_info[bank]; 66 if (info->flash_id != FLASH_MAN_CFI) { 67 printf("Bank %lu: missing or unknown FLASH type\n", bank); 68 return; 69 } 70 if (!info->sector_count) { 71 printf("Bank %lu: no FLASH sectors\n", bank); 72 return; 73 } 74 75 flstart = info->start[0]; 76 flend = flstart + info->size; 77 78 for (i = 0; i < info->sector_count; ++i) { 79 ulong secend; 80 u32 foot1, foot2; 81 82 if (ctrlc()) 83 break; 84 85 if (i == info->sector_count-1) 86 secend = flend; 87 else 88 secend = info->start[i+1]; 89 90 /* Check for v1 header */ 91 foot1 = readl((void *)secend - 0x0c); 92 if (foot1 == 0xA0FFFF9FU) { 93 struct afs_image *afi = &afs_images[num_afs_images]; 94 ulong imginfo; 95 96 afi->flinfo = info; 97 afi->version = 1; 98 afi->flash_mem_start = readl((void *)secend - 0x10); 99 afi->flash_mem_end = readl((void *)secend - 0x14); 100 afi->attributes = readl((void *)secend - 0x08); 101 /* Adjust to even address */ 102 imginfo = afi->flash_mem_end + afi->flash_mem_end % 4; 103 /* Record as a single region */ 104 afi->region_count = 1; 105 afi->regions[0].offset = readl((void *)imginfo + 0x04); 106 afi->regions[0].load_address = 107 readl((void *)imginfo + 0x08); 108 afi->regions[0].size = readl((void *)imginfo + 0x0C); 109 afi->entrypoint = readl((void *)imginfo + 0x10); 110 afi->name = (const char *)imginfo + 0x14; 111 num_afs_images++; 112 } 113 114 /* Check for v2 header */ 115 foot1 = readl((void *)secend - 0x04); 116 foot2 = readl((void *)secend - 0x08); 117 /* This makes up the string "HSLFTOOF" flash footer */ 118 if (foot1 == 0x464F4F54U && foot2 == 0x464C5348U) { 119 struct afs_image *afi = &afs_images[num_afs_images]; 120 ulong imginfo; 121 u32 block_start, block_end; 122 int j; 123 124 afi->flinfo = info; 125 afi->version = readl((void *)secend - 0x0c); 126 imginfo = secend - 0x30 - readl((void *)secend - 0x10); 127 afi->name = (const char *)secend - 0x30; 128 129 afi->entrypoint = readl((void *)imginfo+0x08); 130 afi->attributes = readl((void *)imginfo+0x0c); 131 afi->region_count = readl((void *)imginfo+0x10); 132 block_start = readl((void *)imginfo+0x54); 133 block_end = readl((void *)imginfo+0x58); 134 afi->flash_mem_start = afi->flinfo->start[block_start]; 135 afi->flash_mem_end = afi->flinfo->start[block_end]; 136 137 /* 138 * Check footer CRC, the algorithm saves the inverse 139 * checksum as part of the summed words, and thus 140 * the result should be zero. 141 */ 142 if (compute_crc(imginfo + 8, 0x88) != 0) { 143 printf("BAD CRC on ARM image info\n"); 144 printf("(continuing anyway)\n"); 145 } 146 147 /* Parse regions */ 148 for (j = 0; j < afi->region_count; j++) { 149 afi->regions[j].load_address = 150 readl((void *)imginfo+0x14 + j*0x10); 151 afi->regions[j].size = 152 readl((void *)imginfo+0x18 + j*0x10); 153 afi->regions[j].offset = 154 readl((void *)imginfo+0x1c + j*0x10); 155 /* 156 * At offset 0x20 + j*0x10 there is a region 157 * checksum which seems to be the running 158 * sum + 3, however since we anyway checksum 159 * the entire footer this is skipped over for 160 * checking here. 161 */ 162 } 163 num_afs_images++; 164 } 165 } 166 } 167 168 static void parse_flash(void) 169 { 170 ulong bank; 171 172 /* We have already parsed the images in flash */ 173 if (num_afs_images > 0) 174 return; 175 for (bank = 0; bank < CONFIG_SYS_MAX_FLASH_BANKS; ++bank) 176 parse_bank(bank); 177 } 178 179 static int load_image(const char * const name, const ulong address) 180 { 181 struct afs_image *afi = NULL; 182 int i; 183 184 parse_flash(); 185 for (i = 0; i < num_afs_images; i++) { 186 struct afs_image *tmp = &afs_images[i]; 187 188 if (!strcmp(tmp->name, name)) { 189 afi = tmp; 190 break; 191 } 192 } 193 if (!afi) { 194 printf("image \"%s\" not found in flash\n", name); 195 return CMD_RET_FAILURE; 196 } 197 198 for (i = 0; i < afi->region_count; i++) { 199 ulong from, to; 200 201 from = afi->flash_mem_start + afi->regions[i].offset; 202 if (address) { 203 to = address; 204 } else if (afi->regions[i].load_address) { 205 to = afi->regions[i].load_address; 206 } else { 207 printf("no valid load address\n"); 208 return CMD_RET_FAILURE; 209 } 210 211 memcpy((void *)to, (void *)from, afi->regions[i].size); 212 213 printf("loaded region %d from %08lX to %08lX, %08X bytes\n", 214 i, 215 from, 216 to, 217 afi->regions[i].size); 218 } 219 return CMD_RET_SUCCESS; 220 } 221 222 static void print_images(void) 223 { 224 int i; 225 226 parse_flash(); 227 for (i = 0; i < num_afs_images; i++) { 228 struct afs_image *afi = &afs_images[i]; 229 int j; 230 231 printf("Image: \"%s\" (v%d):\n", afi->name, afi->version); 232 printf(" Entry point: 0x%08X\n", afi->entrypoint); 233 printf(" Attributes: 0x%08X: ", afi->attributes); 234 if (afi->attributes == 0x01) 235 printf("ARM executable"); 236 if (afi->attributes == 0x08) 237 printf("ARM backup"); 238 printf("\n"); 239 printf(" Flash mem start: 0x%08lX\n", 240 afi->flash_mem_start); 241 printf(" Flash mem end: 0x%08lX\n", 242 afi->flash_mem_end); 243 for (j = 0; j < afi->region_count; j++) { 244 printf(" region %d\n" 245 " load address: %08X\n" 246 " size: %08X\n" 247 " offset: %08X\n", 248 j, 249 afi->regions[j].load_address, 250 afi->regions[j].size, 251 afi->regions[j].offset); 252 } 253 } 254 } 255 256 static int exists(const char * const name) 257 { 258 int i; 259 260 parse_flash(); 261 for (i = 0; i < num_afs_images; i++) { 262 struct afs_image *afi = &afs_images[i]; 263 264 if (strcmp(afi->name, name) == 0) 265 return CMD_RET_SUCCESS; 266 } 267 return CMD_RET_FAILURE; 268 } 269 270 static int do_afs(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 271 { 272 int ret = CMD_RET_SUCCESS; 273 274 if (argc == 1) { 275 print_images(); 276 } else if (argc == 3 && !strcmp(argv[1], "exists")) { 277 ret = exists(argv[2]); 278 } else if (argc == 3 && !strcmp(argv[1], "load")) { 279 ret = load_image(argv[2], 0x0); 280 } else if (argc == 4 && !strcmp(argv[1], "load")) { 281 ulong load_addr; 282 283 load_addr = simple_strtoul(argv[3], NULL, 16); 284 ret = load_image(argv[2], load_addr); 285 } else { 286 return CMD_RET_USAGE; 287 } 288 289 return ret; 290 } 291 292 U_BOOT_CMD(afs, 4, 0, do_afs, "show AFS partitions", 293 "no arguments\n" 294 " - list images in flash\n" 295 "exists <image>\n" 296 " - returns 1 if an image exists, else 0\n" 297 "load <image>\n" 298 " - load an image to the location indicated in the header\n" 299 "load <image> 0x<address>\n" 300 " - load an image to the location specified\n"); 301