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