arch/powerpc/cpu/mpc5xxx/spl_boot.c

   1 /*
   2  * Copyright (C) 2012 Stefan Roese <sr@denx.de>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <spl.h>
   9
  10 DECLARE_GLOBAL_DATA_PTR;
  11
  12 /*
  13  * Needed to align size SPL image to a 4-byte length
  14  */
  15 u32 end_align __attribute__ ((section(".end_align")));
  16
  17 /*
  18  * Return selected boot device. On MPC5200 its only NOR flash right now.
  19  */
  20 u32 spl_boot_device(void)
  21 {
  22         return BOOT_DEVICE_NOR;
  23 }
  24
  25 /*
  26  * SPL version of board_init_f()
  27  */
  28 void board_init_f(ulong bootflag)
  29 {
  30         end_align = (u32)__spl_flash_end;
  31
  32         /*
  33          * On MPC5200, the initial RAM (and gd) is located in the internal
  34          * SRAM. So we can actually call the preloader console init code
  35          * before calling initdram(). This makes serial output (printf)
  36          * available very early, even before SDRAM init, which has been
  37          * an U-Boot priciple from day 1.
  38          */
  39
  40         /*
  41          * Init global_data pointer. Has to be done before calling
  42          * get_clocks(), as it stores some clock values into gd needed
  43          * later on in the serial driver.
  44          */
  45         /* Pointer is writable since we allocated a register for it */
  46         gd = (gd_t *)(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET);
  47         /* Clear initial global data */
  48         memset((void *)gd, 0, sizeof(gd_t));
  49
  50         /*
  51          * get_clocks() needs to be called so that the serial driver
  52          * works correctly
  53          */
  54         get_clocks();
  55
  56         /*
  57          * Do rudimental console / serial setup
  58          */
  59         preloader_console_init();
  60
  61         /*
  62          * First we need to initialize the SDRAM, so that the real
  63          * U-Boot or the OS (Linux) can be loaded
  64          */
  65         initdram(0);
  66
  67         /* Clear bss */
  68         memset(__bss_start, '\0', __bss_end - __bss_start);
  69
  70         /*
  71          * Call board_init_r() (SPL framework version) to load and boot
  72          * real U-Boot or OS
  73          */
  74         board_init_r(NULL, 0);
  75         /* Does not return!!! */
  76 }