1 /* 2 * (C) Copyright 2003, Psyent Corporation <www.psyent.com> 3 * Scott McNutt <smcnutt@psyent.com> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 10 #define NIOS_MAGIC 0x534f494e /* enable command line and initrd passing */ 11 12 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images) 13 { 14 void (*kernel)(int, int, int, char *) = (void *)images->ep; 15 char *commandline = env_get("bootargs"); 16 ulong initrd_start = images->rd_start; 17 ulong initrd_end = images->rd_end; 18 char *of_flat_tree = NULL; 19 #if defined(CONFIG_OF_LIBFDT) 20 /* did generic code already find a device tree? */ 21 if (images->ft_len) 22 of_flat_tree = images->ft_addr; 23 #endif 24 if (!of_flat_tree && argc > 1) 25 of_flat_tree = (char *)simple_strtoul(argv[1], NULL, 16); 26 if (of_flat_tree) 27 initrd_end = (ulong)of_flat_tree; 28 29 /* 30 * allow the PREP bootm subcommand, it is required for bootm to work 31 */ 32 if (flag & BOOTM_STATE_OS_PREP) 33 return 0; 34 35 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO)) 36 return 1; 37 38 /* flushes data and instruction caches before calling the kernel */ 39 disable_interrupts(); 40 flush_dcache_all(); 41 42 debug("bootargs=%s @ 0x%lx\n", commandline, (ulong)&commandline); 43 debug("initrd=0x%lx-0x%lx\n", (ulong)initrd_start, (ulong)initrd_end); 44 /* kernel parameters passing 45 * r4 : NIOS magic 46 * r5 : initrd start 47 * r6 : initrd end or fdt 48 * r7 : kernel command line 49 * fdt is passed to kernel via r6, the same as initrd_end. fdt will be 50 * verified with fdt magic. when both initrd and fdt are used at the 51 * same time, fdt must follow immediately after initrd. 52 */ 53 kernel(NIOS_MAGIC, initrd_start, initrd_end, commandline); 54 /* does not return */ 55 56 return 1; 57 } 58