arch/powerpc/cpu/mpc5xxx/spl_boot.c

   1 /*
   2  * Copyright (C) 2012 Stefan Roese <sr@denx.de>
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <common.h>
  19 #include <spl.h>
  20
  21 DECLARE_GLOBAL_DATA_PTR;
  22
  23 /*
  24  * Needed to align size SPL image to a 4-byte length
  25  */
  26 u32 end_align __attribute__ ((section(".end_align")));
  27
  28 /*
  29  * Return selected boot device. On MPC5200 its only NOR flash right now.
  30  */
  31 u32 spl_boot_device(void)
  32 {
  33         return BOOT_DEVICE_NOR;
  34 }
  35
  36 /*
  37  * SPL version of board_init_f()
  38  */
  39 void board_init_f(ulong bootflag)
  40 {
  41         end_align = (u32)__spl_flash_end;
  42
  43         /*
  44          * On MPC5200, the initial RAM (and gd) is located in the internal
  45          * SRAM. So we can actually call the preloader console init code
  46          * before calling initdram(). This makes serial output (printf)
  47          * available very early, even before SDRAM init, which has been
  48          * an U-Boot priciple from day 1.
  49          */
  50
  51         /*
  52          * Init global_data pointer. Has to be done before calling
  53          * get_clocks(), as it stores some clock values into gd needed
  54          * later on in the serial driver.
  55          */
  56         /* Pointer is writable since we allocated a register for it */
  57         gd = (gd_t *)(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET);
  58         /* Clear initial global data */
  59         memset((void *)gd, 0, sizeof(gd_t));
  60
  61         /*
  62          * get_clocks() needs to be called so that the serial driver
  63          * works correctly
  64          */
  65         get_clocks();
  66
  67         /*
  68          * Do rudimental console / serial setup
  69          */
  70         preloader_console_init();
  71
  72         /*
  73          * First we need to initialize the SDRAM, so that the real
  74          * U-Boot or the OS (Linux) can be loaded
  75          */
  76         initdram(0);
  77
  78         /* Clear bss */
  79         memset(__bss_start, '\0', __bss_end - __bss_start);
  80
  81         /*
  82          * Call board_init_r() (SPL framework version) to load and boot
  83          * real U-Boot or OS
  84          */
  85         board_init_r(NULL, 0);
  86         /* Does not return!!! */
  87 }