LXR uboot/arch/blackfin/lib/boot.c

   1/*
   2 * U-boot - boot.c - misc boot helper functions
   3 *
   4 * Copyright (c) 2005-2008 Analog Devices Inc.
   5 *
   6 * (C) Copyright 2000-2004
   7 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   8 *
   9 * Licensed under the GPL-2 or later.
  10 */
  11
  12#include <common.h>
  13#include <command.h>
  14#include <image.h>
  15#include <asm/blackfin.h>
  16
  17#ifdef SHARED_RESOURCES
  18extern void swap_to(int device_id);
  19#endif
  20
  21#ifdef CONFIG_VIDEO
  22extern void video_stop(void);
  23#endif
  24
  25static char *make_command_line(void)
  26{
  27        char *dest = (char *)CONFIG_LINUX_CMDLINE_ADDR;
  28        char *bootargs = getenv("bootargs");
  29
  30        if (bootargs == NULL)
  31                return NULL;
  32
  33        strncpy(dest, bootargs, CONFIG_LINUX_CMDLINE_SIZE);
  34        dest[CONFIG_LINUX_CMDLINE_SIZE - 1] = 0;
  35        return dest;
  36}
  37
  38extern ulong bfin_poweron_retx;
  39
  40int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
  41{
  42        int     (*appl) (char *cmdline);
  43        char    *cmdline;
  44
  45        if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
  46                return 1;
  47
  48#ifdef SHARED_RESOURCES
  49        swap_to(FLASH);
  50#endif
  51
  52#ifdef CONFIG_VIDEO
  53        /* maybe this should be standardized and moved to bootm ... */
  54        video_stop();
  55#endif
  56
  57        appl = (int (*)(char *))images->ep;
  58
  59        printf("Starting Kernel at = %p\n", appl);
  60        cmdline = make_command_line();
  61        icache_disable();
  62        dcache_disable();
  63        asm __volatile__(
  64                "RETX = %[retx];"
  65                "CALL (%0);"
  66                :
  67                : "p"(appl), "q0"(cmdline), [retx] "d"(bfin_poweron_retx)
  68        );
  69        /* does not return */
  70
  71        return 1;
  72}
  73