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