/****************************************************************************
* boards/arm/samv7/common/scripts/memory.ld.template
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
#include <nuttx/config.h>
#define FLASH_START_ADDR 0x00400000
#ifdef CONFIG_ARMV7M_DTCM
# define SRAM_START_ADDR 0x20000000
#else
# define SRAM_START_ADDR 0x20400000
#endif
#define KFLASH_START_ADDR FLASH_START_ADDR
#define KFLASH_SIZE (CONFIG_ARCH_CHIP_SAMV7_MEM_FLASH / 2)
#define UFLASH_START_ADDR (KFLASH_START_ADDR + KFLASH_SIZE)
#define UFLASH_SIZE (CONFIG_ARCH_CHIP_SAMV7_MEM_FLASH - KFLASH_SIZE)
#define KSRAM_START_ADDR SRAM_START_ADDR
#ifdef CONFIG_SAMV7_MEM_RAM_384
# define KSRAM_SIZE (CONFIG_ARCH_CHIP_SAMV7_MEM_RAM / 3)
#else
# define KSRAM_SIZE (CONFIG_ARCH_CHIP_SAMV7_MEM_RAM / 2)
#endif
#define USRAM_START_ADDR (KSRAM_START_ADDR + KSRAM_SIZE)
#define USRAM_SIZE ((CONFIG_ARCH_CHIP_SAMV7_MEM_RAM - KSRAM_SIZE) / 2)
#define XSRAM_START_ADDR (USRAM_START_ADDR + USRAM_SIZE)
#define XSRAM_SIZE (CONFIG_ARCH_CHIP_SAMV7_MEM_RAM - KSRAM_SIZE - USRAM_SIZE)
/* The SAMV7 can have up to 2048Kb of FLASH beginning at address 0x0040:0000
* and up to 384Kb of SRAM beginining at 0x2040:0000 or 0x2000:0000
*
* When booting from FLASH, FLASH memory is aliased to address 0x0000:0000
* where the code expects to begin execution by jumping to the entry point in
* the 0x0400:0000 address range.
*
* The user space partition will be spanned with a single region of size
* 2**n bytes. The alignment of the user-space region must be the same.
* As a consequence, as the user-space increases in size, the alignment
* requirement also increases. The sizes below give the largest possible
* user address spaces (but leave far too much for the OS).
*
* The solution to this wasted memory is to (1) use more than one region to
* span the user spaces, or (2) poke holes in a larger region to trim it
* to fit better.
*
* A detailed memory map example for the 384KB SRAM region is as follows:
*
* 0x2040 0000: Kernel .data region. Typical size: 0.1KB
* ------ ---- Kernel .bss region. Typical size: 1.8KB
* 0x2040 0800: Kernel IDLE thread stack (approximate). Size is
* determined by CONFIG_IDLETHREAD_STACKSIZE and
* adjustments for alignment. Typical is 1KB.
* ------ ---- Padded to 4KB
* 0x2042 0000: User .data region. Size is variable.
* ------- ---- User .bss region Size is variable.
* 0x2044 0000: Beginning of kernel heap. Size determined by
* CONFIG_MM_KERNEL_HEAPSIZE.
* ------ ---- Beginning of user heap. Can vary with other settings.
* 0x2046 0000: End+1 of mappable internal SRAM
*/
MEMORY
{
/* Internal FLASH */
kflash (rx) : ORIGIN = KFLASH_START_ADDR, LENGTH = KFLASH_SIZE
uflash (rx) : ORIGIN = UFLASH_START_ADDR, LENGTH = UFLASH_SIZE
/* Internal SRAM */
ksram (rwx) : ORIGIN = KSRAM_START_ADDR, LENGTH = KSRAM_SIZE
usram (rwx) : ORIGIN = USRAM_START_ADDR, LENGTH = USRAM_SIZE
xsram (rwx) : ORIGIN = XSRAM_START_ADDR, LENGTH = XSRAM_SIZE
}