1 /* SPARC code for booting linux 2.6
4 * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
6 * See file CREDITS for list of people who contributed to this
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
27 #include <asm/byteorder.h>
29 #include <asm/cache.h>
32 #define PRINT_KERNEL_HEADER
34 extern image_header_t header;
35 extern void srmmu_init_cpu(unsigned int entry);
36 extern void prepare_bootargs(char *bootargs);
38 #ifdef CONFIG_USB_UHCI
39 extern int usb_lowlevel_stop(int index);
42 /* sparc kernel argument (the ROM vector) */
43 struct linux_romvec *kernel_arg_promvec;
46 #define PAGE_SIZE 0x1000
47 #define RAMDISK_IMAGE_START_MASK 0x07FF
48 #define RAMDISK_PROMPT_FLAG 0x8000
49 #define RAMDISK_LOAD_FLAG 0x4000
50 struct __attribute__ ((packed)) {
51 char traptable[PAGE_SIZE];
52 char swapper_pg_dir[PAGE_SIZE];
57 char empty_bad_page[PAGE_SIZE];
58 char empty_bad_page_table[PAGE_SIZE];
59 char empty_zero_page[PAGE_SIZE];
60 unsigned char hdr[4]; /* ascii "HdrS" */
61 /* 00.02.06.0b is for Linux kernel 2.6.11 */
62 unsigned char linuxver_mega_major;
63 unsigned char linuxver_major;
64 unsigned char linuxver_minor;
65 unsigned char linuxver_revision;
66 /* header version 0x0203 */
67 unsigned short hdr_ver;
68 union __attribute__ ((packed)) {
69 struct __attribute__ ((packed)) {
70 unsigned short root_flags;
71 unsigned short root_dev;
72 unsigned short ram_flags;
73 unsigned int sparc_ramdisk_image;
74 unsigned int sparc_ramdisk_size;
75 unsigned int reboot_command;
82 /* temporary initrd image holder */
85 void arch_lmb_reserve(struct lmb *lmb)
87 /* Reserve the space used by PROM and stack. This is done
88 * to avoid that the RAM image is copied over stack or
91 lmb_reserve(lmb, CONFIG_SYS_RELOC_MONITOR_BASE, CONFIG_SYS_RAM_END);
94 /* boot the linux kernel */
95 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t * images)
99 void (*kernel) (struct linux_romvec *, void *);
103 * allow the PREP bootm subcommand, it is required for bootm to work
105 if (flag & BOOTM_STATE_OS_PREP)
108 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
111 /* Get virtual address of kernel start */
112 linux_hdr = (void *)images->os.load;
115 kernel = (void (*)(struct linux_romvec *, void *))images->ep;
117 /* check for a SPARC kernel */
118 if ((linux_hdr->hdr[0] != 'H') ||
119 (linux_hdr->hdr[1] != 'd') ||
120 (linux_hdr->hdr[2] != 'r') || (linux_hdr->hdr[3] != 'S')) {
121 puts("Error reading header of SPARC Linux kernel, aborting\n");
124 #ifdef PRINT_KERNEL_HEADER
125 printf("## Found SPARC Linux kernel %d.%d.%d ...\n",
126 linux_hdr->linuxver_major,
127 linux_hdr->linuxver_minor, linux_hdr->linuxver_revision);
130 #ifdef CONFIG_USB_UHCI
134 /* set basic boot params in kernel header now that it has been
135 * extracted and is writeable.
138 ret = image_setup_linux(images);
140 puts("### Failed to relocate RAM disk\n");
144 /* Calc length of RAM disk, if zero no ramdisk available */
145 rd_len = images->rd_end - images->rd_start;
148 /* Update SPARC kernel header so that Linux knows
149 * what is going on and where to find RAM disk.
151 * Set INITRD Image address relative to RAM Start
153 linux_hdr->hdr_input.ver_0203.sparc_ramdisk_image =
154 images->initrd_start - CONFIG_SYS_RAM_BASE;
155 linux_hdr->hdr_input.ver_0203.sparc_ramdisk_size = rd_len;
156 /* Clear READ ONLY flag if set to non-zero */
157 linux_hdr->hdr_input.ver_0203.root_flags = 1;
158 /* Set root device to: Root_RAM0 */
159 linux_hdr->hdr_input.ver_0203.root_dev = 0x100;
160 linux_hdr->hdr_input.ver_0203.ram_flags = 0;
162 /* NOT using RAMDISK image, overwriting kernel defaults */
163 linux_hdr->hdr_input.ver_0203.sparc_ramdisk_image = 0;
164 linux_hdr->hdr_input.ver_0203.sparc_ramdisk_size = 0;
165 /* Leave to kernel defaults
166 linux_hdr->hdr_input.ver_0203.root_flags = 1;
167 linux_hdr->hdr_input.ver_0203.root_dev = 0;
168 linux_hdr->hdr_input.ver_0203.ram_flags = 0;
172 /* Copy bootargs from bootargs variable to kernel readable area */
173 bootargs = getenv("bootargs");
174 prepare_bootargs(bootargs);
176 /* turn on mmu & setup context table & page table for process 0 (kernel) */
177 srmmu_init_cpu((unsigned int)kernel);
179 /* Enter SPARC Linux kernel
180 * From now on the only code in u-boot that will be
181 * executed is the PROM code.
183 kernel(kernel_arg_promvec, (void *)images->ep);
185 /* It will never come to this... */