1 /* 2 * (C) Copyright 2003, Psyent Corporation <www.psyent.com> 3 * Scott McNutt <smcnutt@psyent.com> 4 * 5 * See file CREDITS for list of people who contributed to this 6 * project. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 * MA 02111-1307 USA 22 */ 23 24 #include <common.h> 25 #include <command.h> 26 #include <asm/byteorder.h> 27 #include <asm/cache.h> 28 29 #define NIOS_MAGIC 0x534f494e /* enable command line and initrd passing */ 30 31 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images) 32 { 33 void (*kernel)(int, int, int, char *) = (void *)images->ep; 34 char *commandline = getenv("bootargs"); 35 ulong initrd_start = images->rd_start; 36 ulong initrd_end = images->rd_end; 37 char *of_flat_tree = NULL; 38 #if defined(CONFIG_OF_LIBFDT) 39 ulong of_size = 0; 40 41 /* find flattened device tree */ 42 if (boot_get_fdt(flag, argc, argv, images, &of_flat_tree, &of_size)) 43 return 1; 44 #endif 45 if (!of_flat_tree) 46 of_flat_tree = (char *)simple_strtoul(argv[3], NULL, 16); 47 if (of_flat_tree) 48 initrd_end = (ulong)of_flat_tree; 49 50 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO)) 51 return 1; 52 53 /* flushes data and instruction caches before calling the kernel */ 54 disable_interrupts(); 55 flush_dcache((ulong)kernel, CONFIG_SYS_DCACHE_SIZE); 56 flush_icache((ulong)kernel, CONFIG_SYS_ICACHE_SIZE); 57 58 debug("bootargs=%s @ 0x%lx\n", commandline, (ulong)&commandline); 59 debug("initrd=0x%lx-0x%lx\n", (ulong)initrd_start, (ulong)initrd_end); 60 /* kernel parameters passing 61 * r4 : NIOS magic 62 * r5 : initrd start 63 * r6 : initrd end or fdt 64 * r7 : kernel command line 65 * fdt is passed to kernel via r6, the same as initrd_end. fdt will be 66 * verified with fdt magic. when both initrd and fdt are used at the 67 * same time, fdt must follow immediately after initrd. 68 */ 69 kernel(NIOS_MAGIC, initrd_start, initrd_end, commandline); 70 /* does not return */ 71 72 return 1; 73 } 74