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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2020 Stefan Roese <sr@denx.de>
- */
- #include <command.h>
- #include <config.h>
- #include <cpu_func.h>
- #include <dm.h>
- #include <elf.h>
- #include <env.h>
- #include <asm/global_data.h>
- #include <asm/io.h>
- #include <linux/compat.h>
- #include <linux/ctype.h>
- #include <linux/delay.h>
- #include <linux/io.h>
- #include <mach/cvmx-coremask.h>
- #include <mach/cvmx-bootinfo.h>
- #include <mach/cvmx-bootmem.h>
- #include <mach/cvmx-regs.h>
- #include <mach/cvmx-fuse.h>
- #include <mach/octeon-model.h>
- #include <mach/octeon-feature.h>
- #include <mach/bootoct_cmd.h>
- #include <mach/cvmx-ciu-defs.h>
- DECLARE_GLOBAL_DATA_PTR;
- /* ToDo: Revisit these settings */
- #define OCTEON_RESERVED_LOW_MEM_SIZE (512 * 1024)
- #define OCTEON_RESERVED_LOW_BOOT_MEM_SIZE (1024 * 1024)
- #define BOOTLOADER_BOOTMEM_DESC_SPACE (1024 * 1024)
- /* Default stack and heap sizes, in bytes */
- #define DEFAULT_STACK_SIZE (1 * 1024 * 1024)
- #define DEFAULT_HEAP_SIZE (3 * 1024 * 1024)
- /**
- * NOTE: This must duplicate octeon_boot_descriptor_t in the toolchain
- * octeon-app-init.h file.
- */
- enum {
- /* If set, core should do app-wide init, only one core per app will have
- * this flag set.
- */
- BOOT_FLAG_INIT_CORE = 1,
- OCTEON_BL_FLAG_DEBUG = 1 << 1,
- OCTEON_BL_FLAG_NO_MAGIC = 1 << 2,
- /* If set, use uart1 for console */
- OCTEON_BL_FLAG_CONSOLE_UART1 = 1 << 3,
- OCTEON_BL_FLAG_CONSOLE_PCI = 1 << 4, /* If set, use PCI console */
- /* Call exit on break on serial port */
- OCTEON_BL_FLAG_BREAK = 1 << 5,
- /*
- * Be sure to update OCTEON_APP_INIT_H_VERSION when new fields are added
- * and to conditionalize the new flag's usage based on the version.
- */
- } octeon_boot_descriptor_flag;
- /**
- * NOTE: This must duplicate octeon_boot_descriptor_t in the toolchain
- * octeon-app-init.h file.
- */
- #ifndef OCTEON_CURRENT_DESC_VERSION
- # define OCTEON_CURRENT_DESC_VERSION 7
- #endif
- /**
- * NOTE: This must duplicate octeon_boot_descriptor_t in the toolchain
- * octeon-app-init.h file.
- */
- /* Version 7 changes: Change names of deprecated fields */
- #ifndef OCTEON_ARGV_MAX_ARGS
- # define OCTEON_ARGV_MAX_ARGS 64
- #endif
- /**
- * NOTE: This must duplicate octeon_boot_descriptor_t in the toolchain
- * octeon-app-init.h file.
- */
- #ifndef OCTEON_SERIAL_LEN
- # define OCTEON_SERIAL_LEN 20
- #endif
- /**
- * Bootloader structure used to pass info to Octeon executive startup code.
- * NOTE: all fields are deprecated except for:
- * * desc_version
- * * desc_size,
- * * heap_base
- * * heap_end
- * * eclock_hz
- * * flags
- * * argc
- * * argv
- * * cvmx_desc_vaddr
- * * debugger_flags_base_addr
- *
- * All other fields have been moved to the cvmx_descriptor, and the new
- * fields should be added there. They are left as placeholders in this
- * structure for binary compatibility.
- *
- * NOTE: This structure must match what is in the toolchain octeon-app-init.h
- * file.
- */
- struct octeon_boot_descriptor {
- /* Start of block referenced by assembly code - do not change! */
- u32 desc_version;
- u32 desc_size;
- u64 stack_top;
- u64 heap_base;
- u64 heap_end;
- u64 deprecated17;
- u64 deprecated16;
- /* End of block referenced by assembly code - do not change! */
- u32 deprecated18;
- u32 deprecated15;
- u32 deprecated14;
- u32 argc; /* argc for main() */
- u32 argv[OCTEON_ARGV_MAX_ARGS]; /* argv for main() */
- u32 flags; /* Flags for application */
- u32 core_mask; /* Coremask running this image */
- u32 dram_size; /* DEPRECATED, DRAM size in megabyes. Used up to SDK 1.8.1 */
- u32 phy_mem_desc_addr;
- u32 debugger_flags_base_addr; /* used to pass flags from app to debugger. */
- u32 eclock_hz; /* CPU clock speed, in hz. */
- u32 deprecated10;
- u32 deprecated9;
- u16 deprecated8;
- u8 deprecated7;
- u8 deprecated6;
- u16 deprecated5;
- u8 deprecated4;
- u8 deprecated3;
- char deprecated2[OCTEON_SERIAL_LEN];
- u8 deprecated1[6];
- u8 deprecated0;
- u64 cvmx_desc_vaddr; /* Address of cvmx descriptor */
- };
- static struct octeon_boot_descriptor boot_desc[CVMX_MIPS_MAX_CORES];
- static struct cvmx_bootinfo cvmx_bootinfo_array[CVMX_MIPS_MAX_CORES];
- /**
- * Programs the boot bus moveable region
- * @param base base address to place the boot bus moveable region
- * (bits [31:7])
- * @param region_num Selects which region, 0 or 1 for node 0,
- * 2 or 3 for node 1
- * @param enable Set true to enable, false to disable
- * @param data Pointer to data to put in the region, up to
- * 16 dwords.
- * @param num_words Number of data dwords (up to 32)
- *
- * @return 0 for success, -1 on error
- */
- static int octeon_set_moveable_region(u32 base, int region_num,
- bool enable, const u64 *data,
- unsigned int num_words)
- {
- int node = region_num >> 1;
- u64 val;
- int i;
- u8 node_mask = 0x01; /* ToDo: Currently only one node is supported */
- debug("%s(0x%x, %d, %d, %p, %u)\n", __func__, base, region_num, enable,
- data, num_words);
- if (num_words > 32) {
- printf("%s: Too many words (%d) for region %d\n", __func__,
- num_words, region_num);
- return -1;
- }
- if (base & 0x7f) {
- printf("%s: Error: base address 0x%x must be 128 byte aligned\n",
- __func__, base);
- return -1;
- }
- if (region_num > (node_mask > 1 ? 3 : 1)) {
- printf("%s: Region number %d out of range\n",
- __func__, region_num);
- return -1;
- }
- if (!data && num_words > 0) {
- printf("%s: Error: NULL data\n", __func__);
- return -1;
- }
- region_num &= 1;
- val = MIO_BOOT_LOC_CFG_EN |
- FIELD_PREP(MIO_BOOT_LOC_CFG_BASE, base >> 7);
- debug("%s: Setting MIO_BOOT_LOC_CFG(%d) on node %d to 0x%llx\n",
- __func__, region_num, node, val);
- csr_wr(CVMX_MIO_BOOT_LOC_CFGX(region_num & 1), val);
- val = FIELD_PREP(MIO_BOOT_LOC_ADR_ADR, (region_num ? 0x80 : 0x00) >> 3);
- debug("%s: Setting MIO_BOOT_LOC_ADR start to 0x%llx\n", __func__, val);
- csr_wr(CVMX_MIO_BOOT_LOC_ADR, val);
- for (i = 0; i < num_words; i++) {
- debug(" 0x%02llx: 0x%016llx\n",
- csr_rd(CVMX_MIO_BOOT_LOC_ADR), data[i]);
- csr_wr(CVMX_MIO_BOOT_LOC_DAT, data[i]);
- }
- return 0;
- }
- /**
- * Parse comma separated numbers into an array
- *
- * @param[out] values values read for each node
- * @param[in] str string to parse
- * @param base 0 for auto, otherwise 8, 10 or 16 for the number base
- *
- * @return number of values read.
- */
- static int octeon_parse_nodes(u64 values[CVMX_MAX_NODES],
- const char *str, int base)
- {
- int node = 0;
- char *sep;
- do {
- debug("Parsing node %d: \"%s\"\n", node, str);
- values[node] = simple_strtoull(str, &sep, base);
- debug(" node %d: 0x%llx\n", node, values[node]);
- str = sep + 1;
- } while (++node < CVMX_MAX_NODES && *sep == ',');
- debug("%s: returning %d\n", __func__, node);
- return node;
- }
- /**
- * Parse command line arguments
- *
- * @param argc number of arguments
- * @param[in] argv array of argument strings
- * @param cmd command type
- * @param[out] boot_args parsed values
- *
- * @return number of arguments parsed
- */
- int octeon_parse_bootopts(int argc, char *const argv[],
- enum octeon_boot_cmd_type cmd,
- struct octeon_boot_args *boot_args)
- {
- u64 node_values[CVMX_MAX_NODES];
- int arg, j;
- int num_values;
- int node;
- u8 node_mask = 0x01; /* ToDo: Currently only one node is supported */
- debug("%s(%d, %p, %d, %p)\n", __func__, argc, argv, cmd, boot_args);
- memset(boot_args, 0, sizeof(*boot_args));
- boot_args->stack_size = DEFAULT_STACK_SIZE;
- boot_args->heap_size = DEFAULT_HEAP_SIZE;
- boot_args->node_mask = 0;
- for (arg = 0; arg < argc; arg++) {
- debug(" argv[%d]: %s\n", arg, argv[arg]);
- if (cmd == BOOTOCT && !strncmp(argv[arg], "stack=", 6)) {
- boot_args->stack_size = simple_strtoul(argv[arg] + 6,
- NULL, 0);
- } else if (cmd == BOOTOCT && !strncmp(argv[arg], "heap=", 5)) {
- boot_args->heap_size = simple_strtoul(argv[arg] + 5,
- NULL, 0);
- } else if (!strncmp(argv[arg], "debug", 5)) {
- puts("setting debug flag!\n");
- boot_args->boot_flags |= OCTEON_BL_FLAG_DEBUG;
- } else if (cmd == BOOTOCT && !strncmp(argv[arg], "break", 5)) {
- puts("setting break flag!\n");
- boot_args->boot_flags |= OCTEON_BL_FLAG_BREAK;
- } else if (!strncmp(argv[arg], "forceboot", 9)) {
- boot_args->forceboot = true;
- } else if (!strncmp(argv[arg], "nodemask=", 9)) {
- boot_args->node_mask = hextoul(argv[arg] + 9, NULL);
- } else if (!strncmp(argv[arg], "numcores=", 9)) {
- memset(node_values, 0, sizeof(node_values));
- num_values = octeon_parse_nodes(node_values,
- argv[arg] + 9, 0);
- for (j = 0; j < num_values; j++)
- boot_args->num_cores[j] = node_values[j];
- boot_args->num_cores_set = true;
- } else if (!strncmp(argv[arg], "skipcores=", 10)) {
- memset(node_values, 0, sizeof(node_values));
- num_values = octeon_parse_nodes(node_values,
- argv[arg] + 10, 0);
- for (j = 0; j < num_values; j++)
- boot_args->num_skipped[j] = node_values[j];
- boot_args->num_skipped_set = true;
- } else if (!strncmp(argv[arg], "console_uart=", 13)) {
- boot_args->console_uart = simple_strtoul(argv[arg] + 13,
- NULL, 0);
- if (boot_args->console_uart == 1) {
- boot_args->boot_flags |=
- OCTEON_BL_FLAG_CONSOLE_UART1;
- } else if (!boot_args->console_uart) {
- boot_args->boot_flags &=
- ~OCTEON_BL_FLAG_CONSOLE_UART1;
- }
- } else if (!strncmp(argv[arg], "coremask=", 9)) {
- memset(node_values, 0, sizeof(node_values));
- num_values = octeon_parse_nodes(node_values,
- argv[arg] + 9, 16);
- for (j = 0; j < num_values; j++)
- cvmx_coremask_set64_node(&boot_args->coremask,
- j, node_values[j]);
- boot_args->coremask_set = true;
- } else if (cmd == BOOTOCTLINUX &&
- !strncmp(argv[arg], "namedblock=", 11)) {
- boot_args->named_block = argv[arg] + 11;
- } else if (!strncmp(argv[arg], "endbootargs", 11)) {
- boot_args->endbootargs = 1;
- arg++;
- if (argc >= arg && cmd != BOOTOCTLINUX)
- boot_args->app_name = argv[arg];
- break;
- } else {
- debug(" Unknown argument \"%s\"\n", argv[arg]);
- }
- }
- if (boot_args->coremask_set && boot_args->num_cores_set) {
- puts("Warning: both coremask and numcores are set, using coremask.\n");
- } else if (!boot_args->coremask_set && !boot_args->num_cores_set) {
- cvmx_coremask_set_core(&boot_args->coremask, 0);
- boot_args->coremask_set = true;
- } else if ((!boot_args->coremask_set) && boot_args->num_cores_set) {
- cvmx_coremask_for_each_node(node, node_mask)
- cvmx_coremask_set64_node(&boot_args->coremask, node,
- ((1ull << boot_args->num_cores[node]) - 1) <<
- boot_args->num_skipped[node]);
- boot_args->coremask_set = true;
- }
- /* Update the node mask based on the coremask or the number of cores */
- for (j = 0; j < CVMX_MAX_NODES; j++) {
- if (cvmx_coremask_get64_node(&boot_args->coremask, j))
- boot_args->node_mask |= 1 << j;
- }
- debug("%s: return %d\n", __func__, arg);
- return arg;
- }
- int do_bootoctlinux(struct cmd_tbl *cmdtp, int flag, int argc,
- char *const argv[])
- {
- typedef void __noreturn (*kernel_entry_t)(int, ulong, ulong, ulong);
- kernel_entry_t kernel;
- struct octeon_boot_args boot_args;
- int arg_start = 1;
- int arg_count;
- u64 addr = 0; /* Address of the ELF image */
- int arg0;
- u64 arg1;
- u64 arg2;
- u64 arg3;
- int ret;
- struct cvmx_coremask core_mask;
- struct cvmx_coremask coremask_to_run;
- struct cvmx_coremask avail_coremask;
- int first_core;
- int core;
- const u64 *nmi_code;
- int num_dwords;
- u8 node_mask = 0x01;
- int i;
- cvmx_coremask_clear_all(&core_mask);
- cvmx_coremask_clear_all(&coremask_to_run);
- if (argc >= 2 && (isxdigit(argv[1][0]) && (isxdigit(argv[1][1]) ||
- argv[1][1] == 'x' ||
- argv[1][1] == 'X' ||
- argv[1][1] == '\0'))) {
- addr = hextoul(argv[1], NULL);
- if (!addr)
- addr = CONFIG_SYS_LOAD_ADDR;
- arg_start++;
- }
- if (addr == 0)
- addr = CONFIG_SYS_LOAD_ADDR;
- debug("%s: arg start: %d\n", __func__, arg_start);
- arg_count = octeon_parse_bootopts(argc - arg_start, argv + arg_start,
- BOOTOCTLINUX, &boot_args);
- debug("%s:\n"
- " named block: %s\n"
- " node mask: 0x%x\n"
- " stack size: 0x%x\n"
- " heap size: 0x%x\n"
- " boot flags: 0x%x\n"
- " force boot: %s\n"
- " coremask set: %s\n"
- " num cores set: %s\n"
- " num skipped set: %s\n"
- " endbootargs: %s\n",
- __func__,
- boot_args.named_block ? boot_args.named_block : "none",
- boot_args.node_mask,
- boot_args.stack_size,
- boot_args.heap_size,
- boot_args.boot_flags,
- boot_args.forceboot ? "true" : "false",
- boot_args.coremask_set ? "true" : "false",
- boot_args.num_cores_set ? "true" : "false",
- boot_args.num_skipped_set ? "true" : "false",
- boot_args.endbootargs ? "true" : "false");
- debug(" num cores: ");
- for (i = 0; i < CVMX_MAX_NODES; i++)
- debug("%s%d", i > 0 ? ", " : "", boot_args.num_cores[i]);
- debug("\n num skipped: ");
- for (i = 0; i < CVMX_MAX_NODES; i++) {
- debug("%s%d", i > 0 ? ", " : "", boot_args.num_skipped[i]);
- debug("\n coremask:\n");
- cvmx_coremask_dprint(&boot_args.coremask);
- }
- if (boot_args.endbootargs) {
- debug("endbootargs set, adjusting argc from %d to %d, arg_count: %d, arg_start: %d\n",
- argc, argc - (arg_count + arg_start), arg_count,
- arg_start);
- argc -= (arg_count + arg_start);
- argv += (arg_count + arg_start);
- }
- /*
- * numcores specification overrides a coremask on the same command line
- */
- cvmx_coremask_copy(&core_mask, &boot_args.coremask);
- /*
- * Remove cores from coremask based on environment variable stored in
- * flash
- */
- if (validate_coremask(&core_mask) != 0) {
- puts("Invalid coremask.\n");
- return 1;
- } else if (cvmx_coremask_is_empty(&core_mask)) {
- puts("Coremask is empty after coremask_override mask. Nothing to do.\n");
- return 0;
- }
- if (cvmx_coremask_intersects(&core_mask, &coremask_to_run)) {
- puts("ERROR: Can't load code on core twice! Provided coremask:\n");
- cvmx_coremask_print(&core_mask);
- puts("overlaps previously loaded coremask:\n");
- cvmx_coremask_print(&coremask_to_run);
- return -1;
- }
- debug("Setting up boot descriptor block with core mask:\n");
- cvmx_coremask_dprint(&core_mask);
- /*
- * Add coremask to global mask of cores that have been set up and are
- * runable
- */
- cvmx_coremask_or(&coremask_to_run, &coremask_to_run, &core_mask);
- /*
- * Load kernel ELF image, or try binary if ELF is not detected.
- * This way the much smaller vmlinux.bin can also be started but
- * has to be loaded at the correct address (ep as parameter).
- */
- if (!valid_elf_image(addr))
- printf("Booting binary image instead (vmlinux.bin)...\n");
- else
- addr = load_elf_image_shdr(addr);
- /* Set kernel entry point */
- kernel = (kernel_entry_t)addr;
- /* Init bootmem list for Linux kernel booting */
- if (!cvmx_bootmem_phy_mem_list_init(
- gd->ram_size, OCTEON_RESERVED_LOW_MEM_SIZE,
- (void *)CKSEG0ADDR(BOOTLOADER_BOOTMEM_DESC_SPACE))) {
- printf("FATAL: Error initializing free memory list\n");
- return 0;
- }
- first_core = cvmx_coremask_get_first_core(&coremask_to_run);
- cvmx_coremask_for_each_core(core, &coremask_to_run) {
- debug("%s: Activating core %d\n", __func__, core);
- cvmx_bootinfo_array[core].core_mask =
- cvmx_coremask_get32(&coremask_to_run);
- cvmx_coremask_copy(&cvmx_bootinfo_array[core].ext_core_mask,
- &coremask_to_run);
- if (core == first_core)
- cvmx_bootinfo_array[core].flags |= BOOT_FLAG_INIT_CORE;
- cvmx_bootinfo_array[core].dram_size = gd->ram_size /
- (1024 * 1024);
- cvmx_bootinfo_array[core].dclock_hz = gd->mem_clk * 1000000;
- cvmx_bootinfo_array[core].eclock_hz = gd->cpu_clk;
- cvmx_bootinfo_array[core].led_display_base_addr = 0;
- cvmx_bootinfo_array[core].phy_mem_desc_addr =
- ((u32)(u64)__cvmx_bootmem_internal_get_desc_ptr()) &
- 0x7ffffff;
- cvmx_bootinfo_array[core].major_version = CVMX_BOOTINFO_MAJ_VER;
- cvmx_bootinfo_array[core].minor_version = CVMX_BOOTINFO_MIN_VER;
- cvmx_bootinfo_array[core].fdt_addr = virt_to_phys(gd->fdt_blob);
- boot_desc[core].dram_size = gd->ram_size / (1024 * 1024);
- boot_desc[core].cvmx_desc_vaddr =
- virt_to_phys(&cvmx_bootinfo_array[core]);
- boot_desc[core].desc_version = OCTEON_CURRENT_DESC_VERSION;
- boot_desc[core].desc_size = sizeof(boot_desc[0]);
- boot_desc[core].flags = cvmx_bootinfo_array[core].flags;
- boot_desc[core].eclock_hz = cvmx_bootinfo_array[core].eclock_hz;
- boot_desc[core].argc = argc;
- for (i = 0; i < argc; i++)
- boot_desc[core].argv[i] = (u32)virt_to_phys(argv[i]);
- }
- core = 0;
- arg0 = argc;
- arg1 = (u64)argv;
- arg2 = 0x1; /* Core 0 sets init core for Linux */
- arg3 = XKPHYS | virt_to_phys(&boot_desc[core]);
- debug("## Transferring control to Linux (at address %p) ...\n", kernel);
- /*
- * Flush cache before jumping to application. Let's flush the
- * whole SDRAM area, since we don't know the size of the image
- * that was loaded.
- */
- flush_cache(gd->ram_base, gd->ram_top - gd->ram_base);
- /* Take all cores out of reset */
- csr_wr(CVMX_CIU_PP_RST, 0);
- sync();
- /* Wait a short while for the other cores... */
- mdelay(100);
- /* Install boot code into moveable bus for NMI (other cores) */
- nmi_code = (const u64 *)nmi_bootvector;
- num_dwords = (((u64)&nmi_handler_para[0] - (u64)nmi_code) + 7) / 8;
- ret = octeon_set_moveable_region(0x1fc00000, 0, true, nmi_code,
- num_dwords);
- if (ret) {
- printf("Error installing NMI handler for SMP core startup\n");
- return 0;
- }
- /* Write NMI handler parameters for Linux kernel booting */
- nmi_handler_para[0] = (u64)kernel;
- nmi_handler_para[1] = arg0;
- nmi_handler_para[2] = arg1;
- nmi_handler_para[3] = 0; /* Don't set init core for secondary cores */
- nmi_handler_para[4] = arg3;
- sync();
- /* Wait a short while for the other cores... */
- mdelay(100);
- /*
- * Cores have already been taken out of reset to conserve power.
- * We need to send a NMI to get the cores out of their wait loop
- */
- octeon_get_available_coremask(&avail_coremask);
- debug("Available coremask:\n");
- cvmx_coremask_dprint(&avail_coremask);
- debug("Starting coremask:\n");
- cvmx_coremask_dprint(&coremask_to_run);
- debug("Sending NMIs to other cores\n");
- if (octeon_has_feature(OCTEON_FEATURE_CIU3)) {
- u64 avail_cm;
- int node;
- cvmx_coremask_for_each_node(node, node_mask) {
- avail_cm = cvmx_coremask_get64_node(&avail_coremask,
- node);
- if (avail_cm != 0) {
- debug("Sending NMI to node %d, coremask=0x%llx, CIU3_NMI=0x%llx\n",
- node, avail_cm,
- (node > 0 ? -1ull : -2ull) & avail_cm);
- csr_wr(CVMX_CIU3_NMI,
- (node > 0 ? -1ull : -2ull) & avail_cm);
- }
- }
- } else {
- csr_wr(CVMX_CIU_NMI,
- -2ull & cvmx_coremask_get64(&avail_coremask));
- }
- debug("Done sending NMIs\n");
- /* Wait a short while for the other cores... */
- mdelay(100);
- /*
- * pass address parameter as argv[0] (aka command name),
- * and all remaining args
- * a0 = argc
- * a1 = argv (32 bit physical addresses, not pointers)
- * a2 = init core
- * a3 = boot descriptor address
- * a4/t0 = entry point (only used by assembly stub)
- */
- kernel(arg0, arg1, arg2, arg3);
- return 0;
- }
- U_BOOT_CMD(bootoctlinux, 32, 0, do_bootoctlinux,
- "Boot from a linux ELF image in memory",
- "elf_address [coremask=mask_to_run | numcores=core_cnt_to_run] "
- "[forceboot] [skipcores=core_cnt_to_skip] [namedblock=name] [endbootargs] [app_args ...]\n"
- "elf_address - address of ELF image to load. If 0, default load address\n"
- " is used.\n"
- "coremask - mask of cores to run on. Anded with coremask_override\n"
- " environment variable to ensure only working cores are used\n"
- "numcores - number of cores to run on. Runs on specified number of cores,\n"
- " taking into account the coremask_override.\n"
- "skipcores - only meaningful with numcores. Skips this many cores\n"
- " (starting from 0) when loading the numcores cores.\n"
- " For example, setting skipcores to 1 will skip core 0\n"
- " and load the application starting at the next available core.\n"
- "forceboot - if set, boots application even if core 0 is not in mask\n"
- "namedblock - specifies a named block to load the kernel\n"
- "endbootargs - if set, bootloader does not process any further arguments and\n"
- " only passes the arguments that follow to the kernel.\n"
- " If not set, the kernel gets the entire commnad line as\n"
- " arguments.\n" "\n");
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