// 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");