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https://github.com/AsahiLinux/u-boot
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b4dc0bddbf
On MPC5200, the initial RAM (and gd) is located in the internal SRAM. So we can actually call the preloader console init code before calling initdram(). This makes serial output (printf) available very early, even before SDRAM init, which has been an U-Boot priciple from day 1. Signed-off-by: Stefan Roese <sr@denx.de>
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/*
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* Copyright (C) 2012 Stefan Roese <sr@denx.de>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <common.h>
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#include <spl.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* Needed to align size SPL image to a 4-byte length
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*/
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u32 end_align __attribute__ ((section(".end_align")));
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/*
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* Return selected boot device. On MPC5200 its only NOR flash right now.
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*/
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u32 spl_boot_device(void)
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{
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return BOOT_DEVICE_NOR;
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}
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/*
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* SPL version of board_init_f()
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*/
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void board_init_f(ulong bootflag)
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{
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end_align = (u32)__spl_flash_end;
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/*
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* On MPC5200, the initial RAM (and gd) is located in the internal
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* SRAM. So we can actually call the preloader console init code
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* before calling initdram(). This makes serial output (printf)
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* available very early, even before SDRAM init, which has been
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* an U-Boot priciple from day 1.
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*/
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/*
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* Init global_data pointer. Has to be done before calling
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* get_clocks(), as it stores some clock values into gd needed
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* later on in the serial driver.
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*/
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/* Pointer is writable since we allocated a register for it */
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gd = (gd_t *)(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET);
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/* Clear initial global data */
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memset((void *)gd, 0, sizeof(gd_t));
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/*
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* get_clocks() needs to be called so that the serial driver
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* works correctly
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*/
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get_clocks();
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/*
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* Do rudimental console / serial setup
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*/
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preloader_console_init();
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/*
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* First we need to initialize the SDRAM, so that the real
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* U-Boot or the OS (Linux) can be loaded
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*/
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initdram(0);
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/* Clear bss */
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memset(__bss_start, '\0', __bss_end__ - __bss_start);
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/*
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* Call board_init_r() (SPL framework version) to load and boot
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* real U-Boot or OS
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*/
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board_init_r(NULL, 0);
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/* Does not return!!! */
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}
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