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/**
* @file
*
* @ingroup tms570
*
* @brief Startup code.
*/
/*
* 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
*
* Based on LPC24xx and LPC1768 BSP
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <bsp.h>
#include <bsp/tms570-pom.h>
#include <bsp/irq-generic.h>
#include <bsp/start.h>
#include <bsp/bootcard.h>
#include <bsp/linker-symbols.h>
#include <rtems/endian.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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