arch/microblaze/lib/bootm.c

   1 /*
   2  * (C) Copyright 2007 Michal Simek
   3  * (C) Copyright 2004 Atmark Techno, Inc.
   4  *
   5  * Michal  SIMEK <monstr@monstr.eu>
   6  * Yasushi SHOJI <yashi@atmark-techno.com>
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <common.h>
  12 #include <command.h>
  13 #include <fdt_support.h>
  14 #include <image.h>
  15 #include <u-boot/zlib.h>
  16 #include <asm/byteorder.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 int do_bootm_linux(int flag, int argc, char * const argv[],
  21                    bootm_headers_t *images)
  22 {
  23         /* First parameter is mapped to $r5 for kernel boot args */
  24         void    (*thekernel) (char *, ulong, ulong);
  25         char    *commandline = getenv("bootargs");
  26         ulong   rd_data_start, rd_data_end;
  27
  28         /*
  29          * allow the PREP bootm subcommand, it is required for bootm to work
  30          */
  31         if (flag & BOOTM_STATE_OS_PREP)
  32                 return 0;
  33
  34         if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
  35                 return 1;
  36
  37         int     ret;
  38
  39         char    *of_flat_tree = NULL;
  40 #if defined(CONFIG_OF_LIBFDT)
  41         /* did generic code already find a device tree? */
  42         if (images->ft_len)
  43                 of_flat_tree = images->ft_addr;
  44 #endif
  45
  46         thekernel = (void (*)(char *, ulong, ulong))images->ep;
  47
  48         /* find ramdisk */
  49         ret = boot_get_ramdisk(argc, argv, images, IH_ARCH_MICROBLAZE,
  50                         &rd_data_start, &rd_data_end);
  51         if (ret)
  52                 return 1;
  53
  54         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
  55
  56         if (!of_flat_tree && argc > 1)
  57                 of_flat_tree = (char *)simple_strtoul(argv[1], NULL, 16);
  58
  59         /* fixup the initrd now that we know where it should be */
  60         if (images->rd_start && images->rd_end && of_flat_tree)
  61                 ret = fdt_initrd(of_flat_tree, images->rd_start,
  62                                  images->rd_end);
  63                 if (ret)
  64                         return 1;
  65
  66 #ifdef DEBUG
  67         printf("## Transferring control to Linux (at address 0x%08lx) ",
  68                (ulong)thekernel);
  69         printf("ramdisk 0x%08lx, FDT 0x%08lx...\n",
  70                rd_data_start, (ulong) of_flat_tree);
  71 #endif
  72
  73 #ifdef XILINX_USE_DCACHE
  74         flush_cache(0, XILINX_DCACHE_BYTE_SIZE);
  75 #endif
  76         /*
  77          * Linux Kernel Parameters (passing device tree):
  78          * r5: pointer to command line
  79          * r6: pointer to ramdisk
  80          * r7: pointer to the fdt, followed by the board info data
  81          */
  82         thekernel(commandline, rd_data_start, (ulong)of_flat_tree);
  83         /* does not return */
  84
  85         return 1;
  86 }