/* * (C) Copyright 2003 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include <common.h> #include <command.h> #include <image.h> #include <zlib.h> #include <bzlib.h> #include <watchdog.h> #include <environment.h> #include <asm/byteorder.h> #ifdef CONFIG_SHOW_BOOT_PROGRESS # include <status_led.h> #endif DECLARE_GLOBAL_DATA_PTR; #define PHYSADDR(x) x #define LINUX_MAX_ENVS 256 #define LINUX_MAX_ARGS 256 static ulong get_sp (void); static void set_clocks_in_mhz (bd_t *kbd); extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]); void do_bootm_linux(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[], bootm_headers_t *images) { ulong sp; ulong rd_data_start, rd_data_end, rd_len; ulong initrd_start, initrd_end; int ret; ulong cmd_start, cmd_end; ulong bootmap_base; bd_t *kbd; ulong ep = 0; void (*kernel) (bd_t *, ulong, ulong, ulong, ulong); struct lmb *lmb = images->lmb; bootmap_base = getenv_bootm_low(); /* * Booting a (Linux) kernel image * * Allocate space for command line and board info - the * address should be as high as possible within the reach of * the kernel (see CFG_BOOTMAPSZ settings), but in unused * memory, which means far enough below the current stack * pointer. */ sp = get_sp(); debug ("## Current stack ends at 0x%08lx ", sp); /* adjust sp by 1K to be safe */ sp -= 1024; lmb_reserve(lmb, sp, (CFG_SDRAM_BASE + gd->ram_size - sp)); /* allocate space and init command line */ ret = boot_get_cmdline (lmb, &cmd_start, &cmd_end, bootmap_base); if (ret) { puts("ERROR with allocation of cmdline\n"); goto error; } /* allocate space for kernel copy of board info */ ret = boot_get_kbd (lmb, &kbd, bootmap_base); if (ret) { puts("ERROR with allocation of kernel bd\n"); goto error; } set_clocks_in_mhz(kbd); /* find kernel entry point */ if (images->legacy_hdr_valid) { ep = image_get_ep (images->legacy_hdr_os); #if defined(CONFIG_FIT) } else if (images->fit_uname_os) { ret = fit_image_get_entry (images->fit_hdr_os, images->fit_noffset_os, &ep); if (ret) { puts ("Can't get entry point property!\n"); goto error; } #endif } else { puts ("Could not find kernel entry point!\n"); goto error; } kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))ep; /* find ramdisk */ ret = boot_get_ramdisk (argc, argv, images, IH_ARCH_M68K, &rd_data_start, &rd_data_end); if (ret) goto error; rd_len = rd_data_end - rd_data_start; ret = boot_ramdisk_high (lmb, rd_data_start, rd_len, &initrd_start, &initrd_end); if (ret) goto error; debug("## Transferring control to Linux (at address %08lx) ...\n", (ulong) kernel); show_boot_progress (15); if (!images->autostart) return; /* * Linux Kernel Parameters (passing board info data): * r3: ptr to board info data * r4: initrd_start or 0 if no initrd * r5: initrd_end - unused if r4 is 0 * r6: Start of command line string * r7: End of command line string */ (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end); /* does not return */ return ; error: if (images->autostart) do_reset (cmdtp, flag, argc, argv); return ; } static ulong get_sp (void) { ulong sp; asm("movel %%a7, %%d0\n" "movel %%d0, %0\n": "=d"(sp): :"%d0"); return sp; } static void set_clocks_in_mhz (bd_t *kbd) { char *s; if ((s = getenv("clocks_in_mhz")) != NULL) { /* convert all clock information to MHz */ kbd->bi_intfreq /= 1000000L; kbd->bi_busfreq /= 1000000L; } }