uboot之bootm命令分析(2)

memmove ((void *) ntohl(hdr->ih_load), (uchar *)data, len);
#endif /* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
}
break;
case IH_COMP_GZIP:
printf ("   Uncompressing %s ... ", name);
if (gunzip ((void *)ntohl(hdr->ih_load), unc_len,
   (uchar *)data, &len) != 0) {
puts ("GUNZIP ERROR - must RESET board to recover\n");
SHOW_BOOT_PROGRESS (-6);
do_reset (cmdtp, flag, argc, argv);
}
break;
#ifdef CONFIG_BZIP2
case IH_COMP_BZIP2:
printf ("   Uncompressing %s ... ", name);
/*
* If we've got less than 4 MB of malloc() space,
* use slower decompression algorithm which requires
* at most 2300 KB of memory.
*/
i = BZ2_bzBuffToBuffDecompress ((char*)ntohl(hdr->ih_load),
&unc_len, (char *)data, len,
CFG_MALLOC_LEN < (4096 * 1024), 0);
if (i != BZ_OK) {
printf ("BUNZIP2 ERROR %d - must RESET board to recover\n", i);
SHOW_BOOT_PROGRESS (-6);
udelay(100000);
do_reset (cmdtp, flag, argc, argv);
}
break;
#endif /* CONFIG_BZIP2 */
default:
if (iflag)
enable_interrupts();
printf ("Unimplemented compression type %d\n", hdr->ih_comp);
SHOW_BOOT_PROGRESS (-7);
return 1;
}
puts ("OK\n");
SHOW_BOOT_PROGRESS (7);

switch (hdr->ih_type) {
case IH_TYPE_STANDALONE:
if (iflag)
enable_interrupts();

/* load (and uncompress), but don't start if "autostart"
* is set to "no"
*/
if (((s = getenv("autostart")) != NULL) && (strcmp(s,"no") == 0)) {
char buf[32];
sprintf(buf, "%lX", len);
setenv("filesize", buf);
return 0;
}
appl = (int (*)(int, char *[]))ntohl(hdr->ih_ep);
(*appl)(argc-1, &argv[1]);
return 0;
case IH_TYPE_KERNEL:
case IH_TYPE_MULTI:
/* handled below */
break;
default:
if (iflag)
enable_interrupts();
printf ("Can't boot image type %d\n", hdr->ih_type);
SHOW_BOOT_PROGRESS (-8);
return 1;
}
SHOW_BOOT_PROGRESS (8);

switch (hdr->ih_os) {
default: /* handled by (original) Linux case */
case IH_OS_LINUX:
#ifdef CONFIG_SILENT_CONSOLE
   fixup_silent_linux();
#endif      //这个函数接下来做进一步的跳转前的准备工作，在这之前，就是各种校验和数据解压拷贝工作。
   do_bootm_linux  (cmdtp, flag, argc, argv,
    addr, len_ptr, verify);
   break;
case IH_OS_NETBSD:
   do_bootm_netbsd (cmdtp, flag, argc, argv,
    addr, len_ptr, verify);
   break;

#ifdef CONFIG_LYNXKDI
case IH_OS_LYNXOS:
   do_bootm_lynxkdi (cmdtp, flag, argc, argv,
    addr, len_ptr, verify);
   break;
#endif

case IH_OS_RTEMS:
   do_bootm_rtems (cmdtp, flag, argc, argv,
    addr, len_ptr, verify);
   break;

#if (CONFIG_COMMANDS & CFG_CMD_ELF)
case IH_OS_VXWORKS:
   do_bootm_vxworks (cmdtp, flag, argc, argv,
     addr, len_ptr, verify);
   break;
case IH_OS_QNX:
   do_bootm_qnxelf (cmdtp, flag, argc, argv,
     addr, len_ptr, verify);
   break;
#endif /* CFG_CMD_ELF */
#ifdef CONFIG_ARTOS
case IH_OS_ARTOS:
   do_bootm_artos  (cmdtp, flag, argc, argv,
    addr, len_ptr, verify);
   break;
#endif
}

SHOW_BOOT_PROGRESS (-9);
#ifdef DEBUG
puts ("\n## Control returned to monitor - resetting...\n");
do_reset (cmdtp, flag, argc, argv);
#endif
return 1;
}