/**************************************************************************** * configs/samv71-xult/scripts/memory.ld * * Copyright (C) 2015 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * 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. * ****************************************************************************/ /* The SAMV71Q21 has 2048Kb of FLASH beginning at address 0x0400:0000 and * 384Kb of SRAM beginining at 0x2040:0000 * * 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. * * NOTE: that the DTCM address of 0x2000:0000 is used for SRAM. If DTCM is * disabled, then the accesses will actually occur on the AHB bus. * * 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 for the 384KB SRAM region is as follows: * * 0x20000 0000: Kernel .data region. Typical size: 0.1KB * ------- ---- Kernel .bss region. Typical size: 1.8KB * 0x20000 0800: Kernel IDLE thread stack (approximate). Size is * determined by CONFIG_IDLETHREAD_STACKSIZE and * adjustments for alignment. Typical is 1KB. * ------- ---- Padded to 4KB * 0x20002 0000: User .data region. Size is variable. * ------- ---- User .bss region Size is variable. * 0x20000 2000: Beginning of kernel heap. Size determined by * CONFIG_MM_KERNEL_HEAPSIZE. * ------- ---- Beginning of user heap. Can vary with other settings. * 0x20004 0000: End+1 of mappable internal SRAM */ MEMORY { /* 2048KiB of internal FLASH */ kflash (rx) : ORIGIN = 0x04000000, LENGTH = 1M uflash (rx) : ORIGIN = 0x04100000, LENGTH = 1M /* 384Kb of internal SRAM */ ksram (rwx) : ORIGIN = 0x20000000, LENGTH = 128K usram (rwx) : ORIGIN = 0x20020000, LENGTH = 128K xsram (rwx) : ORIGIN = 0x20040000, LENGTH = 128K }