67 lines
2.9 KiB
Plaintext
67 lines
2.9 KiB
Plaintext
/****************************************************************************
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* boards/arm/samv7/same70-qmtech/scripts/memory.ld
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/* The SAME70N19 has 512Kb of FLASH beginning at address 0x0040:0000 and
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* 256Kb of SRAM beginining at 0x2040:0000
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*
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* When booting from FLASH, FLASH memory is aliased to address 0x0000:0000
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* where the code expects to begin execution by jumping to the entry point in
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* the 0x0400:0000 address range.
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*
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* The user space partition will be spanned with a single region of size
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* 2**n bytes. The alignment of the user-space region must be the same.
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* As a consequence, as the user-space increases in size, the alignment
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* requirement also increases. The sizes below give the largest possible
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* user address spaces (but leave far too much for the OS).
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*
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* The solution to this wasted memory is to (1) use more than one region to
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* span the user spaces, or (2) poke holes in a larger region to trim it
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* to fit better.
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*
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* A detailed memory map for the 256KB SRAM region is as follows:
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*
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* 0x2040 0000: Kernel .data region. Typical size: 0.1KB
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* ------ ---- Kernel .bss region. Typical size: 1.8KB
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* 0x2040 0800: Kernel IDLE thread stack (approximate). Size is
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* determined by CONFIG_IDLETHREAD_STACKSIZE and
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* adjustments for alignment. Typical is 1KB.
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* ------ ---- Padded to 4KB
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* 0x2041 0000: User .data region. Size is variable.
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* ------- ---- User .bss region Size is variable.
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* 0x2042 0000: Beginning of kernel heap. Size determined by
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* CONFIG_MM_KERNEL_HEAPSIZE.
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* ------ ---- Beginning of user heap. Can vary with other settings.
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* 0x2044 0000: End+1 of mappable internal SRAM
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*/
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MEMORY
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{
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/* 512Kb of internal FLASH */
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kflash (rx) : ORIGIN = 0x00400000, LENGTH = 256K
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uflash (rx) : ORIGIN = 0x00440000, LENGTH = 256K
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/* 256Kb of internal SRAM */
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ksram (rwx) : ORIGIN = 0x20400000, LENGTH = 64K
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usram (rwx) : ORIGIN = 0x20410000, LENGTH = 64K
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xsram (rwx) : ORIGIN = 0x20420000, LENGTH = 128K
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}
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