;  Copyright (c) 2021 Arm Limited. All rights reserved.
;  SPDX-License-Identifier: Apache-2.0
;
;  Licensed 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.

; *************************************************************
; ***       Scatter-Loading Description File                ***
; *************************************************************
;
; Sections used:
;---------------------------------------------------------
; |    Start    |      End    |    Size     |   Remarks  |
;-|-------------|-------------|-------------|------------|
; | 0x0000_0000 | 0x0010_0000 | 0x0010_0000 | ITCM (RO)  |
; | 0x0010_0000 | 0x0030_0000 | 0x0020_0000 | BRAM (RW)  |
; | 0x2000_0000 | 0x2040_0000 | 0x0040_0000 | DTCM (RW)  |
; | 0x6000_0000 | 0x6200_0000 | 0x0200_0000 | DRAM (RW)  |
;-|-------------|-------------|-------------|------------|
; ITCM is aliased at 0x1000_0000 (single bank)
; BRAM is aliased at 0x1010_0000
; DTCM is aliased at 0x3000_0000 (four banks of 1MiB each)
; DRAM is aliased at 0x7000_0000 (section is 256MiB)
;
; Note: Ethos-U55 can only access DRAM and BRAM sections
;---------------------------------------------------------
; First load region
;---------------------------------------------------------
LOAD_REGION_0       0x00000000                  0x00100000
{
    ;-----------------------------------------------------
    ; First part of code mem - 1MiB
    ;-----------------------------------------------------
    itcm.bin        0x00000000                  0x00100000
    {
        *.o (RESET, +First)
        * (InRoot$$Sections)
        .ANY (+RO)
    }

    ;-----------------------------------------------------
    ; Code memory's 2MiB - reserved for activation buffers
    ; Make sure this is uninitialised.
    ;-----------------------------------------------------
    bram.bin        0x00100000  UNINIT          0x00200000
    {
        ; activation buffers a.k.a tensor arena
        *.o (.bss.NoInit.activation_buf)
    }

    ;-----------------------------------------------------
    ; 1MiB bank is used for any other RW or ZI data
    ; Note: this region is internal to the Cortex-M CPU
    ;-----------------------------------------------------
    dtcm.bin        0x20000000                  0x00100000
    {
        .ANY(+RW +ZI)
    }

    ;-----------------------------------------------------
    ; 128kiB of stack space within SRAM region
    ;-----------------------------------------------------
    ARM_LIB_STACK   0x20100000 EMPTY ALIGN 8    0x00020000
    {}

    ;-----------------------------------------------------
    ; 2MiB of heap space within the SRAM region
    ;-----------------------------------------------------
    ARM_LIB_HEAP    0x20200000 EMPTY ALIGN 8    0x00200000
    {}
}

;---------------------------------------------------------
; Second load region
;---------------------------------------------------------
LOAD_REGION_1       0x60000000                  0x02000000
{
    ;-----------------------------------------------------
    ; 32 MiB of DRAM space for nn model and input vectors
    ;-----------------------------------------------------
    dram.bin        0x60000000                  0x02000000
    {
        ; nn model's baked in input matrices
        *.o (ifm)

        ; nn model
        *.o (nn_model)

        ; if the activation buffer (tensor arena) doesn't
        ; fit in the SRAM region, we accommodate it here
        *.o (activation_buf)
    }
}