cmd/bootefi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  EFI application loader
   4  *
   5  *  Copyright (c) 2016 Alexander Graf
   6  */
   7
   8 #define LOG_CATEGORY LOGC_EFI
   9
  10 #include <common.h>
  11 #include <charset.h>
  12 #include <command.h>
  13 #include <dm.h>
  14 #include <efi_loader.h>
  15 #include <efi_selftest.h>
  16 #include <env.h>
  17 #include <errno.h>
  18 #include <image.h>
  19 #include <log.h>
  20 #include <malloc.h>
  21 #include <linux/libfdt.h>
  22 #include <linux/libfdt_env.h>
  23 #include <mapmem.h>
  24 #include <memalign.h>
  25 #include <asm-generic/sections.h>
  26 #include <linux/linkage.h>
  27
  28 DECLARE_GLOBAL_DATA_PTR;
  29
  30 static struct efi_device_path *bootefi_image_path;
  31 static struct efi_device_path *bootefi_device_path;
  32 static void *image_addr;
  33 static size_t image_size;
  34
  35 /**
  36  * efi_clear_bootdev() - clear boot device
  37  */
  38 static void efi_clear_bootdev(void)
  39 {
  40         efi_free_pool(bootefi_device_path);
  41         efi_free_pool(bootefi_image_path);
  42         bootefi_device_path = NULL;
  43         bootefi_image_path = NULL;
  44         image_addr = NULL;
  45         image_size = 0;
  46 }
  47
  48 /**
  49  * efi_set_bootdev() - set boot device
  50  *
  51  * This function is called when a file is loaded, e.g. via the 'load' command.
  52  * We use the path to this file to inform the UEFI binary about the boot device.
  53  *
  54  * @dev:                device, e.g. "MMC"
  55  * @devnr:              number of the device, e.g. "1:2"
  56  * @path:               path to file loaded
  57  * @buffer:             buffer with file loaded
  58  * @buffer_size:        size of file loaded
  59  */
  60 void efi_set_bootdev(const char *dev, const char *devnr, const char *path,
  61                      void *buffer, size_t buffer_size)
  62 {
  63         struct efi_device_path *device, *image;
  64         efi_status_t ret;
  65
  66         /* Forget overwritten image */
  67         if (buffer + buffer_size >= image_addr &&
  68             image_addr + image_size >= buffer)
  69                 efi_clear_bootdev();
  70
  71         /* Remember only PE-COFF and FIT images */
  72         if (efi_check_pe(buffer, buffer_size, NULL) != EFI_SUCCESS) {
  73 #ifdef CONFIG_FIT
  74                 if (!fit_check_format(buffer))
  75                         return;
  76                 /*
  77                  * FIT images of type EFI_OS are started via command bootm.
  78                  * We should not use their boot device with the bootefi command.
  79                  */
  80                 buffer = 0;
  81                 buffer_size = 0;
  82 #else
  83                 return;
  84 #endif
  85         }
  86
  87         /* efi_set_bootdev() is typically called repeatedly, recover memory */
  88         efi_clear_bootdev();
  89
  90         image_addr = buffer;
  91         image_size = buffer_size;
  92
  93         ret = efi_dp_from_name(dev, devnr, path, &device, &image);
  94         if (ret == EFI_SUCCESS) {
  95                 bootefi_device_path = device;
  96                 if (image) {
  97                         /* FIXME: image should not contain device */
  98                         struct efi_device_path *image_tmp = image;
  99
 100                         efi_dp_split_file_path(image, &device, &image);
 101                         efi_free_pool(image_tmp);
 102                 }
 103                 bootefi_image_path = image;
 104         } else {
 105                 efi_clear_bootdev();
 106         }
 107 }
 108
 109 /**
 110  * efi_env_set_load_options() - set load options from environment variable
 111  *
 112  * @handle:             the image handle
 113  * @env_var:            name of the environment variable
 114  * @load_options:       pointer to load options (output)
 115  * Return:              status code
 116  */
 117 static efi_status_t efi_env_set_load_options(efi_handle_t handle,
 118                                              const char *env_var,
 119                                              u16 **load_options)
 120 {
 121         const char *env = env_get(env_var);
 122         size_t size;
 123         u16 *pos;
 124         efi_status_t ret;
 125
 126         *load_options = NULL;
 127         if (!env)
 128                 return EFI_SUCCESS;
 129         size = sizeof(u16) * (utf8_utf16_strlen(env) + 1);
 130         pos = calloc(size, 1);
 131         if (!pos)
 132                 return EFI_OUT_OF_RESOURCES;
 133         *load_options = pos;
 134         utf8_utf16_strcpy(&pos, env);
 135         ret = efi_set_load_options(handle, size, *load_options);
 136         if (ret != EFI_SUCCESS) {
 137                 free(*load_options);
 138                 *load_options = NULL;
 139         }
 140         return ret;
 141 }
 142
 143 #if !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
 144
 145 /**
 146  * copy_fdt() - Copy the device tree to a new location available to EFI
 147  *
 148  * The FDT is copied to a suitable location within the EFI memory map.
 149  * Additional 12 KiB are added to the space in case the device tree needs to be
 150  * expanded later with fdt_open_into().
 151  *
 152  * @fdtp:       On entry a pointer to the flattened device tree.
 153  *              On exit a pointer to the copy of the flattened device tree.
 154  *              FDT start
 155  * Return:      status code
 156  */
 157 static efi_status_t copy_fdt(void **fdtp)
 158 {
 159         unsigned long fdt_ram_start = -1L, fdt_pages;
 160         efi_status_t ret = 0;
 161         void *fdt, *new_fdt;
 162         u64 new_fdt_addr;
 163         uint fdt_size;
 164         int i;
 165
 166         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 167                 u64 ram_start = gd->bd->bi_dram[i].start;
 168                 u64 ram_size = gd->bd->bi_dram[i].size;
 169
 170                 if (!ram_size)
 171                         continue;
 172
 173                 if (ram_start < fdt_ram_start)
 174                         fdt_ram_start = ram_start;
 175         }
 176
 177         /*
 178          * Give us at least 12 KiB of breathing room in case the device tree
 179          * needs to be expanded later.
 180          */
 181         fdt = *fdtp;
 182         fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
 183         fdt_size = fdt_pages << EFI_PAGE_SHIFT;
 184
 185         /*
 186          * Safe fdt location is at 127 MiB.
 187          * On the sandbox convert from the sandbox address space.
 188          */
 189         new_fdt_addr = (uintptr_t)map_sysmem(fdt_ram_start + 0x7f00000 +
 190                                              fdt_size, 0);
 191         ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 192                                  EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
 193                                  &new_fdt_addr);
 194         if (ret != EFI_SUCCESS) {
 195                 /* If we can't put it there, put it somewhere */
 196                 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
 197                 ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 198                                          EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
 199                                          &new_fdt_addr);
 200                 if (ret != EFI_SUCCESS) {
 201                         log_err("ERROR: Failed to reserve space for FDT\n");
 202                         goto done;
 203                 }
 204         }
 205         new_fdt = (void *)(uintptr_t)new_fdt_addr;
 206         memcpy(new_fdt, fdt, fdt_totalsize(fdt));
 207         fdt_set_totalsize(new_fdt, fdt_size);
 208
 209         *fdtp = (void *)(uintptr_t)new_fdt_addr;
 210 done:
 211         return ret;
 212 }
 213
 214 /**
 215  * get_config_table() - get configuration table
 216  *
 217  * @guid:       GUID of the configuration table
 218  * Return:      pointer to configuration table or NULL
 219  */
 220 static void *get_config_table(const efi_guid_t *guid)
 221 {
 222         size_t i;
 223
 224         for (i = 0; i < systab.nr_tables; i++) {
 225                 if (!guidcmp(guid, &systab.tables[i].guid))
 226                         return systab.tables[i].table;
 227         }
 228         return NULL;
 229 }
 230
 231 #endif /* !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE) */
 232
 233 /**
 234  * efi_install_fdt() - install device tree
 235  *
 236  * If fdt is not EFI_FDT_USE_INTERNAL, the device tree located at that memory
 237  * address will will be installed as configuration table, otherwise the device
 238  * tree located at the address indicated by environment variable fdt_addr or as
 239  * fallback fdtcontroladdr will be used.
 240  *
 241  * On architectures using ACPI tables device trees shall not be installed as
 242  * configuration table.
 243  *
 244  * @fdt:        address of device tree or EFI_FDT_USE_INTERNAL to use the
 245  *              the hardware device tree as indicated by environment variable
 246  *              fdt_addr or as fallback the internal device tree as indicated by
 247  *              the environment variable fdtcontroladdr
 248  * Return:      status code
 249  */
 250 efi_status_t efi_install_fdt(void *fdt)
 251 {
 252         /*
 253          * The EBBR spec requires that we have either an FDT or an ACPI table
 254          * but not both.
 255          */
 256 #if CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
 257         if (fdt) {
 258                 log_err("ERROR: can't have ACPI table and device tree.\n");
 259                 return EFI_LOAD_ERROR;
 260         }
 261 #else
 262         bootm_headers_t img = { 0 };
 263         efi_status_t ret;
 264
 265         if (fdt == EFI_FDT_USE_INTERNAL) {
 266                 const char *fdt_opt;
 267                 uintptr_t fdt_addr;
 268
 269                 /* Look for device tree that is already installed */
 270                 if (get_config_table(&efi_guid_fdt))
 271                         return EFI_SUCCESS;
 272                 /* Check if there is a hardware device tree */
 273                 fdt_opt = env_get("fdt_addr");
 274                 /* Use our own device tree as fallback */
 275                 if (!fdt_opt) {
 276                         fdt_opt = env_get("fdtcontroladdr");
 277                         if (!fdt_opt) {
 278                                 log_err("ERROR: need device tree\n");
 279                                 return EFI_NOT_FOUND;
 280                         }
 281                 }
 282                 fdt_addr = simple_strtoul(fdt_opt, NULL, 16);
 283                 if (!fdt_addr) {
 284                         log_err("ERROR: invalid $fdt_addr or $fdtcontroladdr\n");
 285                         return EFI_LOAD_ERROR;
 286                 }
 287                 fdt = map_sysmem(fdt_addr, 0);
 288         }
 289
 290         /* Install device tree */
 291         if (fdt_check_header(fdt)) {
 292                 log_err("ERROR: invalid device tree\n");
 293                 return EFI_LOAD_ERROR;
 294         }
 295
 296         /* Prepare device tree for payload */
 297         ret = copy_fdt(&fdt);
 298         if (ret) {
 299                 log_err("ERROR: out of memory\n");
 300                 return EFI_OUT_OF_RESOURCES;
 301         }
 302
 303         if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 304                 log_err("ERROR: failed to process device tree\n");
 305                 return EFI_LOAD_ERROR;
 306         }
 307
 308         /* Create memory reservations as indicated by the device tree */
 309         efi_carve_out_dt_rsv(fdt);
 310
 311         /* Install device tree as UEFI table */
 312         ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
 313         if (ret != EFI_SUCCESS) {
 314                 log_err("ERROR: failed to install device tree\n");
 315                 return ret;
 316         }
 317 #endif /* GENERATE_ACPI_TABLE */
 318
 319         return EFI_SUCCESS;
 320 }
 321
 322 /**
 323  * do_bootefi_exec() - execute EFI binary
 324  *
 325  * The image indicated by @handle is started. When it returns the allocated
 326  * memory for the @load_options is freed.
 327  *
 328  * @handle:             handle of loaded image
 329  * @load_options:       load options
 330  * Return:              status code
 331  *
 332  * Load the EFI binary into a newly assigned memory unwinding the relocation
 333  * information, install the loaded image protocol, and call the binary.
 334  */
 335 static efi_status_t do_bootefi_exec(efi_handle_t handle, void *load_options)
 336 {
 337         efi_status_t ret;
 338         efi_uintn_t exit_data_size = 0;
 339         u16 *exit_data = NULL;
 340
 341         /* Call our payload! */
 342         ret = EFI_CALL(efi_start_image(handle, &exit_data_size, &exit_data));
 343         if (ret != EFI_SUCCESS) {
 344                 log_err("## Application failed, r = %lu\n",
 345                         ret & ~EFI_ERROR_MASK);
 346                 if (exit_data) {
 347                         log_err("## %ls\n", exit_data);
 348                         efi_free_pool(exit_data);
 349                 }
 350         }
 351
 352         efi_restore_gd();
 353
 354         free(load_options);
 355
 356         return ret;
 357 }
 358
 359 /**
 360  * do_efibootmgr() - execute EFI boot manager
 361  *
 362  * Return:      status code
 363  */
 364 static int do_efibootmgr(void)
 365 {
 366         efi_handle_t handle;
 367         efi_status_t ret;
 368         void *load_options;
 369
 370         ret = efi_bootmgr_load(&handle, &load_options);
 371         if (ret != EFI_SUCCESS) {
 372                 log_notice("EFI boot manager: Cannot load any image\n");
 373                 return CMD_RET_FAILURE;
 374         }
 375
 376         ret = do_bootefi_exec(handle, load_options);
 377
 378         if (ret != EFI_SUCCESS)
 379                 return CMD_RET_FAILURE;
 380
 381         return CMD_RET_SUCCESS;
 382 }
 383
 384 /**
 385  * do_bootefi_image() - execute EFI binary
 386  *
 387  * Set up memory image for the binary to be loaded, prepare device path, and
 388  * then call do_bootefi_exec() to execute it.
 389  *
 390  * @image_opt:  string of image start address
 391  * Return:      status code
 392  */
 393 static int do_bootefi_image(const char *image_opt)
 394 {
 395         void *image_buf;
 396         unsigned long addr, size;
 397         efi_status_t ret;
 398
 399 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 400         if (!strcmp(image_opt, "hello")) {
 401                 image_buf = __efi_helloworld_begin;
 402                 size = __efi_helloworld_end - __efi_helloworld_begin;
 403                 efi_clear_bootdev();
 404         } else
 405 #endif
 406         {
 407                 addr = strtoul(image_opt, NULL, 16);
 408                 /* Check that a numeric value was passed */
 409                 if (!addr)
 410                         return CMD_RET_USAGE;
 411
 412                 image_buf = map_sysmem(addr, 0);
 413
 414                 if (image_buf != image_addr) {
 415                         log_err("No UEFI binary known at %s\n", image_opt);
 416                         return CMD_RET_FAILURE;
 417                 }
 418                 size = image_size;
 419         }
 420         ret = efi_run_image(image_buf, size);
 421
 422         if (ret != EFI_SUCCESS)
 423                 return CMD_RET_FAILURE;
 424
 425         return CMD_RET_SUCCESS;
 426 }
 427
 428 /**
 429  * efi_run_image() - run loaded UEFI image
 430  *
 431  * @source_buffer:      memory address of the UEFI image
 432  * @source_size:        size of the UEFI image
 433  * Return:              status code
 434  */
 435 efi_status_t efi_run_image(void *source_buffer, efi_uintn_t source_size)
 436 {
 437         efi_handle_t mem_handle = NULL, handle;
 438         struct efi_device_path *file_path = NULL;
 439         struct efi_device_path *msg_path;
 440         efi_status_t ret;
 441         u16 *load_options;
 442
 443         if (!bootefi_device_path || !bootefi_image_path) {
 444                 /*
 445                  * Special case for efi payload not loaded from disk,
 446                  * such as 'bootefi hello' or for example payload
 447                  * loaded directly into memory via JTAG, etc:
 448                  */
 449                 file_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
 450                                             (uintptr_t)source_buffer,
 451                                             source_size);
 452                 /*
 453                  * Make sure that device for device_path exist
 454                  * in load_image(). Otherwise, shell and grub will fail.
 455                  */
 456                 ret = efi_create_handle(&mem_handle);
 457                 if (ret != EFI_SUCCESS)
 458                         goto out;
 459
 460                 ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
 461                                        file_path);
 462                 if (ret != EFI_SUCCESS)
 463                         goto out;
 464                 msg_path = file_path;
 465         } else {
 466                 file_path = efi_dp_append(bootefi_device_path,
 467                                           bootefi_image_path);
 468                 msg_path = bootefi_image_path;
 469         }
 470
 471         log_info("Booting %pD\n", msg_path);
 472
 473         ret = EFI_CALL(efi_load_image(false, efi_root, file_path, source_buffer,
 474                                       source_size, &handle));
 475         if (ret != EFI_SUCCESS) {
 476                 log_err("Loading image failed\n");
 477                 goto out;
 478         }
 479
 480         /* Transfer environment variable as load options */
 481         ret = efi_env_set_load_options(handle, "bootargs", &load_options);
 482         if (ret != EFI_SUCCESS)
 483                 goto out;
 484
 485         ret = do_bootefi_exec(handle, load_options);
 486
 487 out:
 488         efi_delete_handle(mem_handle);
 489         efi_free_pool(file_path);
 490         return ret;
 491 }
 492
 493 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 494 static efi_status_t bootefi_run_prepare(const char *load_options_path,
 495                 struct efi_device_path *device_path,
 496                 struct efi_device_path *image_path,
 497                 struct efi_loaded_image_obj **image_objp,
 498                 struct efi_loaded_image **loaded_image_infop)
 499 {
 500         efi_status_t ret;
 501         u16 *load_options;
 502
 503         ret = efi_setup_loaded_image(device_path, image_path, image_objp,
 504                                      loaded_image_infop);
 505         if (ret != EFI_SUCCESS)
 506                 return ret;
 507
 508         /* Transfer environment variable as load options */
 509         return efi_env_set_load_options((efi_handle_t)*image_objp,
 510                                         load_options_path,
 511                                         &load_options);
 512 }
 513
 514 /**
 515  * bootefi_test_prepare() - prepare to run an EFI test
 516  *
 517  * Prepare to run a test as if it were provided by a loaded image.
 518  *
 519  * @image_objp:         pointer to be set to the loaded image handle
 520  * @loaded_image_infop: pointer to be set to the loaded image protocol
 521  * @path:               dummy file path used to construct the device path
 522  *                      set in the loaded image protocol
 523  * @load_options_path:  name of a U-Boot environment variable. Its value is
 524  *                      set as load options in the loaded image protocol.
 525  * Return:              status code
 526  */
 527 static efi_status_t bootefi_test_prepare
 528                 (struct efi_loaded_image_obj **image_objp,
 529                  struct efi_loaded_image **loaded_image_infop, const char *path,
 530                  const char *load_options_path)
 531 {
 532         efi_status_t ret;
 533
 534         /* Construct a dummy device path */
 535         bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
 536         if (!bootefi_device_path)
 537                 return EFI_OUT_OF_RESOURCES;
 538
 539         bootefi_image_path = efi_dp_from_file(NULL, 0, path);
 540         if (!bootefi_image_path) {
 541                 ret = EFI_OUT_OF_RESOURCES;
 542                 goto failure;
 543         }
 544
 545         ret = bootefi_run_prepare(load_options_path, bootefi_device_path,
 546                                   bootefi_image_path, image_objp,
 547                                   loaded_image_infop);
 548         if (ret == EFI_SUCCESS)
 549                 return ret;
 550
 551 failure:
 552         efi_clear_bootdev();
 553         return ret;
 554 }
 555
 556 /**
 557  * bootefi_run_finish() - finish up after running an EFI test
 558  *
 559  * @loaded_image_info: Pointer to a struct which holds the loaded image info
 560  * @image_obj: Pointer to a struct which holds the loaded image object
 561  */
 562 static void bootefi_run_finish(struct efi_loaded_image_obj *image_obj,
 563                                struct efi_loaded_image *loaded_image_info)
 564 {
 565         efi_restore_gd();
 566         free(loaded_image_info->load_options);
 567         efi_delete_handle(&image_obj->header);
 568 }
 569
 570 /**
 571  * do_efi_selftest() - execute EFI selftest
 572  *
 573  * Return:      status code
 574  */
 575 static int do_efi_selftest(void)
 576 {
 577         struct efi_loaded_image_obj *image_obj;
 578         struct efi_loaded_image *loaded_image_info;
 579         efi_status_t ret;
 580
 581         ret = bootefi_test_prepare(&image_obj, &loaded_image_info,
 582                                    "\\selftest", "efi_selftest");
 583         if (ret != EFI_SUCCESS)
 584                 return CMD_RET_FAILURE;
 585
 586         /* Execute the test */
 587         ret = EFI_CALL(efi_selftest(&image_obj->header, &systab));
 588         bootefi_run_finish(image_obj, loaded_image_info);
 589
 590         return ret != EFI_SUCCESS;
 591 }
 592 #endif /* CONFIG_CMD_BOOTEFI_SELFTEST */
 593
 594 /**
 595  * do_bootefi() - execute `bootefi` command
 596  *
 597  * @cmdtp:      table entry describing command
 598  * @flag:       bitmap indicating how the command was invoked
 599  * @argc:       number of arguments
 600  * @argv:       command line arguments
 601  * Return:      status code
 602  */
 603 static int do_bootefi(struct cmd_tbl *cmdtp, int flag, int argc,
 604                       char *const argv[])
 605 {
 606         efi_status_t ret;
 607         void *fdt;
 608
 609         if (argc < 2)
 610                 return CMD_RET_USAGE;
 611
 612         /* Initialize EFI drivers */
 613         ret = efi_init_obj_list();
 614         if (ret != EFI_SUCCESS) {
 615                 log_err("Error: Cannot initialize UEFI sub-system, r = %lu\n",
 616                         ret & ~EFI_ERROR_MASK);
 617                 return CMD_RET_FAILURE;
 618         }
 619
 620         if (argc > 2) {
 621                 uintptr_t fdt_addr;
 622
 623                 fdt_addr = simple_strtoul(argv[2], NULL, 16);
 624                 fdt = map_sysmem(fdt_addr, 0);
 625         } else {
 626                 fdt = EFI_FDT_USE_INTERNAL;
 627         }
 628         ret = efi_install_fdt(fdt);
 629         if (ret == EFI_INVALID_PARAMETER)
 630                 return CMD_RET_USAGE;
 631         else if (ret != EFI_SUCCESS)
 632                 return CMD_RET_FAILURE;
 633
 634         if (IS_ENABLED(CONFIG_CMD_BOOTEFI_BOOTMGR)) {
 635                 if (!strcmp(argv[1], "bootmgr"))
 636                         return do_efibootmgr();
 637         }
 638 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 639         if (!strcmp(argv[1], "selftest"))
 640                 return do_efi_selftest();
 641 #endif
 642
 643         return do_bootefi_image(argv[1]);
 644 }
 645
 646 #ifdef CONFIG_SYS_LONGHELP
 647 static char bootefi_help_text[] =
 648         "<image address> [fdt address]\n"
 649         "  - boot EFI payload stored at address <image address>.\n"
 650         "    If specified, the device tree located at <fdt address> gets\n"
 651         "    exposed as EFI configuration table.\n"
 652 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 653         "bootefi hello\n"
 654         "  - boot a sample Hello World application stored within U-Boot\n"
 655 #endif
 656 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 657         "bootefi selftest [fdt address]\n"
 658         "  - boot an EFI selftest application stored within U-Boot\n"
 659         "    Use environment variable efi_selftest to select a single test.\n"
 660         "    Use 'setenv efi_selftest list' to enumerate all tests.\n"
 661 #endif
 662 #ifdef CONFIG_CMD_BOOTEFI_BOOTMGR
 663         "bootefi bootmgr [fdt address]\n"
 664         "  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
 665         "\n"
 666         "    If specified, the device tree located at <fdt address> gets\n"
 667         "    exposed as EFI configuration table.\n"
 668 #endif
 669         ;
 670 #endif
 671
 672 U_BOOT_CMD(
 673         bootefi, 3, 0, do_bootefi,
 674         "Boots an EFI payload from memory",
 675         bootefi_help_text
 676 );