diff options
Diffstat (limited to 'arch/m68k/lib/m68k-linuxboot.c')
| -rw-r--r-- | arch/m68k/lib/m68k-linuxboot.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/arch/m68k/lib/m68k-linuxboot.c b/arch/m68k/lib/m68k-linuxboot.c new file mode 100644 index 0000000000..63b0cc134d --- /dev/null +++ b/arch/m68k/lib/m68k-linuxboot.c @@ -0,0 +1,176 @@ +/* + * Copyright (c) 2008 Carsten Schlote <c.schlote@konzeptpark.de> + * See file CREDITS for list of people who contributed to this project. + * + * This file is part of U-Boot V2. + * + * U-Boot V2 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 3 of the License, or + * (at your option) any later version. + * + * U-Boot V2 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 U-Boot V2. If not, see <http://www.gnu.org/licenses/>. + */ + +/** @file Linux boot preparation code. + * + * This file is responsible to start a linux kernel on + * Coldfire targets. + * + * @note Only Colilo mode supported yet. + */ +#include <common.h> +#include <command.h> +#include <driver.h> +#include <image.h> +#include <zlib.h> +#include <init.h> + +#include <asm/byteorder.h> +#include <asm/setup.h> +#include <environment.h> +#include <boot.h> +#include <asm/u-boot-m68k.h> +#include <asm/bootinfo.h> + + +static int m68k_architecture = MACH_TYPE_GENERIC; + + +/* + * Setup M68k/Coldfire bootrecord info + */ +#if defined (CONFIG_SETUP_MEMORY_TAGS) || \ + defined (CONFIG_CMDLINE_TAG) || \ + defined (CONFIG_INITRD_TAG) + + +static void setup_boot_record(char* start_boot_rec, const char* command_line) +{ + struct bi_record* record; + + *start_boot_rec++ = 'C'; + *start_boot_rec++ = 'o'; + *start_boot_rec++ = 'L'; + *start_boot_rec++ = 'i'; + *start_boot_rec++ = 'L'; + *start_boot_rec++ = 'o'; + + record = (struct bi_record*) start_boot_rec; + + /* specify memory layout */ +#ifdef CONFIG_SETUP_MEMORY_TAGS + record->tag = BI_MEMCHUNK; + record->data[0] = 0; + record->data[1] = 64 * 1024 * 1024; // TODO: to be changed for different boards + record->size = sizeof (record->tag) + sizeof (record->size) + + sizeof (record->data[0]) + sizeof (record->data[0]); + record = (struct bi_record *) ((void *) record + record->size); +#endif + + /* add a kernel command line */ +#ifdef CONFIG_CMDLINE_TAG + record->tag = BI_COMMAND_LINE; + strcpy ((char *) &record->data, command_line); + record->size = sizeof (record->tag) + sizeof (record->size) + + max (sizeof (record->data[0]), strlen (command_line)+1); + record = (struct bi_record *) ((void *) record + record->size); +#endif + + /* Add reference to initrd */ +#ifdef CONFIG_INITRD_TAG +#endif + + /* Mark end of tags */ + record->tag = 0; + record->data[0] = 0; + record->data[1] = 0; + record->size = sizeof(record->tag) + sizeof (record->size) + + sizeof (record->data[0]) + sizeof (record->data[0]); +} + +#else +#define setup_boot_record(start_boot_rec,command_line) while (0) { } + +#endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */ + + +static int do_bootm_linux(struct image_data *data) +{ + image_header_t *os_header = &data->os->header; + void (*theKernel)(int zero, int arch, uint params); + const char *commandline = getenv ("bootargs"); + uint32_t loadaddr,loadsize; + + if (os_header->ih_type == IH_TYPE_MULTI) { + printf("Multifile images not handled at the moment\n"); + return -1; + } + + printf("commandline: %s\n", commandline); + + theKernel = (void (*)(int,int,uint))ntohl((os_header->ih_ep)); + + debug ("## Transferring control to Linux (at address %08lx) ...\n", + (ulong) theKernel); + + loadaddr = (uint32_t)ntohl(os_header->ih_load); + loadsize = (uint32_t)ntohl(os_header->ih_size); + setup_boot_record( (char*)(loadaddr+loadsize),(char*)commandline); + + if (relocate_image(data->os, (void *)loadaddr)) + return -1; + + /* we assume that the kernel is in place */ + printf ("\nStarting kernel image at 0x%08x size 0x%08x eentry 0x%08x\n\n", + loadaddr, loadsize, (ulong) theKernel); + + /* Bring board into inactive post-reset state again */ + cleanup_before_linux (); + + /* Jump to kernel entry point */ + theKernel (0, m68k_architecture, 0xdeadbeaf); + + enable_interrupts(); + printf("Error: Loaded kernel returned. Probably it couldn't\n" + "find it's bootrecord.\n"); + return -1; +} + +/* + * Register handler for m68k Kernel Images + */ +static int image_handle_cmdline_parse(struct image_data *data, int opt, char *optarg) +{ + switch (opt) + { + case 'a': + m68k_architecture = simple_strtoul(optarg, NULL, 0); + return 0; + default: + return 1; + } +} + +static struct image_handler handler = +{ + .cmdline_options = "a:", + .cmdline_parse = image_handle_cmdline_parse, + .help_string = " -a <arch> use architecture number <arch>", + + .bootm = do_bootm_linux, + .image_type = IH_OS_LINUX, +}; + +static int m68klinux_register_image_handler(void) +{ + return register_image_handler(&handler); +} + +late_initcall(m68klinux_register_image_handler); |