u-boot/lib_arm/armlinux.c

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/*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* Copyright (C) 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
*
* 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 <cmd_boot.h>
#include <image.h>
#include <zlib.h>
#include <asm/byteorder.h>
#include <asm/setup.h>
#define tag_size(type) ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)
#define tag_next(t) ((struct tag *)((u32 *)(t) + (t)->hdr.size))
#if defined (CONFIG_SETUP_MEMORY_TAGS) || \
defined (CONFIG_CMDLINE_TAG) || \
defined (CONFIG_INITRD_TAG) || \
defined (CONFIG_VFD)
static void setup_start_tag(bd_t *bd);
# ifdef CONFIG_SETUP_MEMORY_TAGS
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static void setup_memory_tags(bd_t *bd);
# endif
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static void setup_commandline_tag(bd_t *bd, char *commandline);
#if 0
static void setup_ramdisk_tag(bd_t *bd);
#endif
# ifdef CONFIG_INITRD_TAG
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static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end);
# endif
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static void setup_end_tag(bd_t *bd);
# if defined (CONFIG_VFD)
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static void setup_videolfb_tag(gd_t *gd);
# endif
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static struct tag *params;
#endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */
#ifdef CONFIG_SHOW_BOOT_PROGRESS
# include <status_led.h>
# define SHOW_BOOT_PROGRESS(arg) show_boot_progress(arg)
#else
# define SHOW_BOOT_PROGRESS(arg)
#endif
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extern image_header_t header; /* from cmd_bootm.c */
void do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
ulong addr, ulong *len_ptr, int verify)
{
DECLARE_GLOBAL_DATA_PTR;
ulong len = 0, checksum;
ulong initrd_start, initrd_end;
ulong data;
void (*theKernel)(int zero, int arch);
image_header_t *hdr = &header;
bd_t *bd = gd->bd;
#ifdef CONFIG_CMDLINE_TAG
char *commandline = getenv("bootargs");
#endif
theKernel = (void (*)(int, int))ntohl(hdr->ih_ep);
/*
* Check if there is an initrd image
*/
if (argc >= 3) {
SHOW_BOOT_PROGRESS (9);
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addr = simple_strtoul(argv[2], NULL, 16);
printf ("## Loading Ramdisk Image at %08lx ...\n", addr);
/* Copy header so we can blank CRC field for re-calculation */
memcpy (&header, (char *)addr, sizeof(image_header_t));
if (ntohl(hdr->ih_magic) != IH_MAGIC) {
printf ("Bad Magic Number\n");
SHOW_BOOT_PROGRESS (-10);
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do_reset (cmdtp, flag, argc, argv);
}
data = (ulong)&header;
len = sizeof(image_header_t);
checksum = ntohl(hdr->ih_hcrc);
hdr->ih_hcrc = 0;
if (crc32 (0, (char *)data, len) != checksum) {
printf ("Bad Header Checksum\n");
SHOW_BOOT_PROGRESS (-11);
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do_reset (cmdtp, flag, argc, argv);
}
SHOW_BOOT_PROGRESS (10);
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print_image_hdr (hdr);
data = addr + sizeof(image_header_t);
len = ntohl(hdr->ih_size);
if (verify) {
ulong csum = 0;
printf (" Verifying Checksum ... ");
csum = crc32 (0, (char *)data, len);
if (csum != ntohl(hdr->ih_dcrc)) {
printf ("Bad Data CRC\n");
SHOW_BOOT_PROGRESS (-12);
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do_reset (cmdtp, flag, argc, argv);
}
printf ("OK\n");
}
SHOW_BOOT_PROGRESS (11);
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if ((hdr->ih_os != IH_OS_LINUX) ||
(hdr->ih_arch != IH_CPU_ARM) ||
(hdr->ih_type != IH_TYPE_RAMDISK) ) {
printf ("No Linux ARM Ramdisk Image\n");
SHOW_BOOT_PROGRESS (-13);
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do_reset (cmdtp, flag, argc, argv);
}
/*
* Now check if we have a multifile image
*/
} else if ((hdr->ih_type==IH_TYPE_MULTI) && (len_ptr[1])) {
ulong tail = ntohl(len_ptr[0]) % 4;
int i;
SHOW_BOOT_PROGRESS (13);
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/* skip kernel length and terminator */
data = (ulong)(&len_ptr[2]);
/* skip any additional image length fields */
for (i=1; len_ptr[i]; ++i)
data += 4;
/* add kernel length, and align */
data += ntohl(len_ptr[0]);
if (tail) {
data += 4 - tail;
}
len = ntohl(len_ptr[1]);
} else {
/*
* no initrd image
*/
SHOW_BOOT_PROGRESS (14);
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data = 0;
}
#ifdef DEBUG
if (!data) {
printf ("No initrd\n");
}
#endif
if (data) {
initrd_start = data;
initrd_end = initrd_start + len;
} else {
initrd_start = 0;
initrd_end = 0;
}
SHOW_BOOT_PROGRESS (15);
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#ifdef DEBUG
printf ("## Transferring control to Linux (at address %08lx) ...\n",
(ulong)theKernel);
#endif
#if defined (CONFIG_SETUP_MEMORY_TAGS) || \
defined (CONFIG_CMDLINE_TAG) || \
defined (CONFIG_INITRD_TAG) || \
defined (CONFIG_VFD)
setup_start_tag(bd);
#ifdef CONFIG_SETUP_MEMORY_TAGS
setup_memory_tags(bd);
#endif
#ifdef CONFIG_CMDLINE_TAG
setup_commandline_tag(bd, commandline);
#endif
#ifdef CONFIG_INITRD_TAG
setup_initrd_tag(bd, initrd_start, initrd_end);
#endif
#if 0
setup_ramdisk_tag(bd);
#endif
#if defined (CONFIG_VFD)
setup_videolfb_tag(gd);
#endif
setup_end_tag(bd);
#endif
/* we assume that the kernel is in place */
printf("\nStarting kernel ...\n\n");
cleanup_before_linux();
theKernel(0, bd->bi_arch_number);
}
#if defined (CONFIG_SETUP_MEMORY_TAGS) || \
defined (CONFIG_CMDLINE_TAG) || \
defined (CONFIG_INITRD_TAG) || \
defined (CONFIG_VFD)
static void setup_start_tag(bd_t *bd)
{
params = (struct tag *)bd->bi_boot_params;
params->hdr.tag = ATAG_CORE;
params->hdr.size = tag_size(tag_core);
params->u.core.flags = 0;
params->u.core.pagesize = 0;
params->u.core.rootdev = 0;
params = tag_next(params);
}
#ifdef CONFIG_SETUP_MEMORY_TAGS
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static void setup_memory_tags(bd_t *bd)
{
int i;
for(i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
params->hdr.tag = ATAG_MEM;
params->hdr.size = tag_size(tag_mem32);
params->u.mem.start = bd->bi_dram[i].start;
params->u.mem.size = bd->bi_dram[i].size;
params = tag_next(params);
}
}
#endif /* CONFIG_SETUP_MEMORY_TAGS */
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static void setup_commandline_tag(bd_t *bd, char *commandline)
{
char *p;
/* eat leading white space */
for(p = commandline; *p == ' '; p++)
;
/* skip non-existent command lines so the kernel will still
* use its default command line.
*/
if(*p == '\0')
return;
params->hdr.tag = ATAG_CMDLINE;
params->hdr.size = (sizeof(struct tag_header) + strlen(p) + 1 + 4) >> 2;
strcpy(params->u.cmdline.cmdline, p);
params = tag_next(params);
}
#ifndef ATAG_INITRD2
#define ATAG_INITRD2 0x54420005
#endif
#ifdef CONFIG_INITRD_TAG
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static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
{
/* an ATAG_INITRD node tells the kernel where the compressed
* ramdisk can be found. ATAG_RDIMG is a better name, actually.
*/
params->hdr.tag = ATAG_INITRD2;
params->hdr.size = tag_size(tag_initrd);
params->u.initrd.start = initrd_start;
params->u.initrd.size = initrd_end - initrd_start;
params = tag_next(params);
}
#endif /* CONFIG_INITRD_TAG */
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#if 0
static void setup_ramdisk_tag(bd_t *bd)
{
/* an ATAG_RAMDISK node tells the kernel how large the
* decompressed ramdisk will become.
*/
params->hdr.tag = ATAG_RAMDISK;
params->hdr.size = tag_size(tag_ramdisk);
params->u.ramdisk.start = 0;
/*params->u.ramdisk.size = RAMDISK_SIZE; */
params->u.ramdisk.flags = 1; /* automatically load ramdisk */
params = tag_next(params);
}
#endif /* 0 */
#if defined (CONFIG_VFD)
static void setup_videolfb_tag(gd_t *gd)
{
/* An ATAG_VIDEOLFB node tells the kernel where and how large
* the framebuffer for video was allocated (among other things).
* Note that a _physical_ address is passed !
*
* We only use it to pass the address and size, the other entries
* in the tag_videolfb are not of interest.
*/
params->hdr.tag = ATAG_VIDEOLFB;
params->hdr.size = tag_size(tag_videolfb);
params->u.videolfb.lfb_base = (u32)gd->fb_base;
/* 7168 = 256*4*56/8 - actually 2 pages (8192 bytes) are allocated */
params->u.videolfb.lfb_size = 7168;
params = tag_next(params);
}
#endif
static void setup_end_tag(bd_t *bd)
{
params->hdr.tag = ATAG_NONE;
params->hdr.size = 0;
}
#endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */