u-boot/arch/arm/mach-stm32/soc.c
Lokesh Vutla f2ef204312 arm: v7R: Add support for MPU
The Memory Protection Unit(MPU) allows to partition memory into regions
and set individual protection attributes for each region. In absence
of MPU a default map[1] will take effect. Add support for configuring
MPU on Cortex-R, by reusing the existing support for Cortex-M processor.

[1] http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0460d/I1002400.html

Tested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2018-05-07 15:53:29 -04:00

41 lines
912 B
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
* Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
*/
#include <common.h>
#include <asm/io.h>
#include <asm/armv7_mpu.h>
int arch_cpu_init(void)
{
int i;
struct mpu_region_config stm32_region_config[] = {
/*
* Make SDRAM area cacheable & executable.
*/
#if defined(CONFIG_STM32F4)
{ 0x00000000, REGION_0, XN_DIS, PRIV_RW_USR_RW,
O_I_WB_RD_WR_ALLOC, REGION_16MB },
#endif
#if defined(CONFIG_STM32F7)
{ 0xC0000000, REGION_0, XN_DIS, PRIV_RW_USR_RW,
O_I_WB_RD_WR_ALLOC, REGION_16MB },
#endif
#if defined(CONFIG_STM32H7)
{ 0xD0000000, REGION_0, XN_DIS, PRIV_RW_USR_RW,
O_I_WB_RD_WR_ALLOC, REGION_32MB },
#endif
};
disable_mpu();
for (i = 0; i < ARRAY_SIZE(stm32_region_config); i++)
mpu_config(&stm32_region_config[i]);
enable_mpu();
return 0;
}