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/*
* lowlevel_init.S
*
* AM33XX low level initialization.
*
* Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
*
* Initial Code by:
* Mansoor Ahamed <mansoor.ahamed@ti.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <config.h>
#include <asm/arch/hardware.h>
_mark1:
.word mark1
_lowlevel_init1:
.word lowlevel_init
_s_init_start:
.word s_init_start
_TEXT_BASE:
.word CONFIG_SYS_TEXT_BASE /* sdram load addr from config.mk */
/*****************************************************************************
* lowlevel_init: - Platform low level init.
****************************************************************************/
.globl lowlevel_init
lowlevel_init:
/* The link register is saved in ip by start.S */
mov r6, ip
/* check if we are already running from RAM */
ldr r2, _lowlevel_init1
ldr r3, _TEXT_BASE
sub r4, r2, r3
sub r0, pc, r4
ldr sp, SRAM_STACK
mark1:
ldr r5, _mark1
sub r5, r5, r2 /* bytes between mark1 and lowlevel_init */
sub r0, r0, r5 /* r0 <- _start w.r.t current place of execution */
mov r10, #0x0 /* r10 has in_ddr used by s_init() */
ands r0, r0, #0xC0000000
/* MSB 2 bits <> 0 then we are in ocmc or DDR */
cmp r0, #0x80000000
bne s_init_start
mov r10, #0x01
b s_init_start
s_init_start:
mov r0, r10 /* passing in_ddr in r0 */
bl s_init
/* back to arch calling code */
mov pc, r6
/* the literal pools origin */
.ltorg
SRAM_STACK:
/* Place stack at the top */
.word LOW_LEVEL_SRAM_STACK
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