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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSBSPsARMTMS570
*
* @brief This source file contains the bsp_start() implementation.
*/
/*
* Copyright (C) 2014 Premysl Houdek <kom541000@gmail.com>
*
* Google Summer of Code 2014 at
* Czech Technical University in Prague
* Zikova 1903/4
* 166 36 Praha 6
* Czech Republic
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <bsp/tms570-pom.h>
#include <bsp/irq-generic.h>
#include <bsp/bootcard.h>
#include <bsp/linker-symbols.h>
void bsp_start( void )
{
void *need_remap_ptr;
unsigned int need_remap_int;
tms570_initialize_and_clear();
/*
* If RTEMS image does not start at address 0x00000000
* then first level exception table at memory begin has
* to be replaced to point to RTEMS handlers addresses.
*
* There is no VBAR or other option because Cortex-R
* does provides only fixed address 0x00000000 for exceptions
* (0xFFFF0000-0xFFFF001C alternative SCTLR.V = 1 cannot
* be used because target area corersponds to PMM peripheral
* registers on TMS570).
*
* Alternative is to use jumps over SRAM based trampolines
* but that is not compatible with
* Check TCRAM1 ECC error detection logic
* which intentionally introduces data abort during startup
* to check SRAM and if exception processing goes through
* SRAM then it leads to CPU error halt.
*
* So use of POM to replace jumps to vectors target
* addresses seems to be the best option for now.
*
* The passing of linker symbol (represented as start address
* of global array) through dummy asm block ensures that C compiler
* cannot optimize comparison out on premise that reference cannot
* evaluate to NULL definition in standard.
*/
need_remap_ptr = bsp_start_vector_table_begin;
asm volatile ("\n": "=r" (need_remap_int): "0" (need_remap_ptr));
if ( need_remap_int != 0 ) {
tms570_pom_remap();
}
/* Interrupts */
bsp_interrupt_initialize();
}
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