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/**
* @file
*
* @ingroup arm_start
*
* @brief Rasberry Pi startup code.
*/
/*
* Copyright (c) 2013. Hesham AL-Matary
* Copyright (c) 2013 by Alan Cudmore
* based on work by:
* Copyright (c) 2009
* embedded brains GmbH
* Obere Lagerstr. 30
* D-82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* 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 <bspopts.h>
#include <bsp/start.h>
#include <bsp/raspberrypi.h>
#include <bsp/mm.h>
#include <libcpu/arm-cp15.h>
void BSP_START_TEXT_SECTION bsp_start_hook_0(void)
{
uint32_t sctlr_val;
sctlr_val = arm_cp15_get_control();
/*
* Current U-boot loader seems to start kernel image
* with I and D caches on and MMU enabled.
* If RTEMS application image finds that cache is on
* during startup then disable caches.
*/
if (sctlr_val & (ARM_CP15_CTRL_I | ARM_CP15_CTRL_C | ARM_CP15_CTRL_M)) {
if (sctlr_val & (ARM_CP15_CTRL_C | ARM_CP15_CTRL_M)) {
/*
* If the data cache is on then ensure that it is clean
* before switching off to be extra carefull.
*/
arm_cp15_drain_write_buffer();
arm_cp15_data_cache_clean_and_invalidate();
}
arm_cp15_flush_prefetch_buffer();
sctlr_val &= ~(ARM_CP15_CTRL_I | ARM_CP15_CTRL_C | ARM_CP15_CTRL_M | ARM_CP15_CTRL_A);
arm_cp15_set_control(sctlr_val);
arm_cp15_tlb_invalidate();
arm_cp15_flush_prefetch_buffer();
arm_cp15_data_cache_invalidate();
arm_cp15_instruction_cache_invalidate();
}
/* Clear Translation Table Base Control Register */
arm_cp15_set_translation_table_base_control_register(0);
/* Clear Secure or Non-secure Vector Base Address Register */
arm_cp15_set_vector_base_address(0);
}
void BSP_START_TEXT_SECTION bsp_start_hook_1(void)
{
bsp_start_copy_sections();
bsp_memory_management_initialize();
bsp_start_clear_bss();
}
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