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sh: Add support load and boot of Initrd. 

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
This commit is contained in:
Nobuhiro Iwamatsu 2010-09-28 12:14:57 +09:00 committed by Nobuhiro Iwamatsu
parent c62491d260
commit cf2c87d322
1 changed files with 65 additions and 1 deletions
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66
arch/sh/lib/bootm.c
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@ -43,6 +43,41 @@ static void hexdump(unsigned char *buf, int len)
}
#endif
#define MOUNT_ROOT_RDONLY 0x000
#define RAMDISK_FLAGS 0x004
#define ORIG_ROOT_DEV 0x008
#define LOADER_TYPE 0x00c
#define INITRD_START 0x010
#define INITRD_SIZE 0x014
#define COMMAND_LINE 0x100
#define RD_PROMPT (1<<15)
#define RD_DOLOAD (1<<14)
#define CMD_ARG_RD_PROMPT "prompt_ramdisk="
#define CMD_ARG_RD_DOLOAD "load_ramdisk="
#ifdef CONFIG_SH_SDRAM_OFFSET
#define GET_INITRD_START(initrd, linux) (initrd - linux + CONFIG_SH_SDRAM_OFFSET)
#else
#define GET_INITRD_START(initrd, linux) (initrd - linux)
#endif
static void set_sh_linux_param(unsigned long param_addr, unsigned long data)
{
*(unsigned long *)(param_addr) = data;
}
static unsigned long sh_check_cmd_arg(char *cmdline, char *key, int base)
{
unsigned long val = 0;
char *p = strstr(cmdline, key);
if (p) {
p += strlen(key);
val = simple_strtol(p, NULL, base);
}
return val;
}
int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
{
/* Linux kernel load address */
@ -51,7 +86,7 @@ int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *ima
unsigned char *param
= (unsigned char *)image_get_load(images->legacy_hdr_os);
/* Linux kernel command line */
char *cmdline = (char *)param + 0x100;
char *cmdline = (char *)param + COMMAND_LINE;
/* PAGE_SIZE */
unsigned long size = images->ep - (unsigned long)param;
char *bootargs = getenv("bootargs");
@ -61,8 +96,37 @@ int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *ima
/* Setup parameters */
memset(param, 0, size); /* Clear zero page */
/* Set commandline */
strcpy(cmdline, bootargs);
sh_check_cmd_arg(bootargs, CMD_ARG_RD_DOLOAD, 10);
/* Initrd */
if (images->rd_start || images->rd_end) {
unsigned long ramdisk_flags;
int val = sh_check_cmd_arg(bootargs, CMD_ARG_RD_PROMPT, 10);
if (val == 1)
ramdisk_flags |= RD_PROMPT;
else
ramdisk_flags &= ~RD_PROMPT;
val = sh_check_cmd_arg(bootargs, CMD_ARG_RD_DOLOAD, 10);
if (val == 1)
ramdisk_flags |= RD_DOLOAD;
else
ramdisk_flags &= ~RD_DOLOAD;
set_sh_linux_param((unsigned long)param + MOUNT_ROOT_RDONLY, 0x0001);
set_sh_linux_param((unsigned long)param + RAMDISK_FLAGS, ramdisk_flags);
set_sh_linux_param((unsigned long)param + ORIG_ROOT_DEV, 0x0200);
set_sh_linux_param((unsigned long)param + LOADER_TYPE, 0x0001);
set_sh_linux_param((unsigned long)param + INITRD_START,
GET_INITRD_START(images->rd_start, CONFIG_SYS_SDRAM_BASE));
set_sh_linux_param((unsigned long)param + INITRD_SIZE,
images->rd_end - images->rd_start);
}
/* Boot kernel */
kernel();
/* does not return */