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;  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                ***
; *************************************************************
; Please see docs/sections/appendix.md for memory mapping
; information.
;
; Note: Ethos-U NPU can access BRAM, internal SRAM and the DDR
;       sections => activation buffers and the model should
;       only be placed in those regions.
;

;---------------------------------------------------------
; First load region (SRAM/BRAM) 2MiB region
;---------------------------------------------------------
LOAD_REGION_0       0x11000000                  0x00200000
{
    ;-----------------------------------------------------
    ; First 640K of SRAM/BRAM. Our vector table also
    ; resides here as the default INITSVTOR is 0x11000000.
    ; We currently do not use the ITCM for any code, but
    ; could potentially put some critical code in there
    ; if we need to.
    ;-----------------------------------------------------
    bram.bin        0x11000000                  0x000A0000
    {
        *.o (RESET, +First)
        * (InRoot$$Sections)

        ; Essentially only RO (code + data)
        .ANY (+RO)
    }

    ;-----------------------------------------------------
    ; Next 384K of SRAM/BRAM region for RO, RW and ZI
    ; data, 8 byte aligned.
    ;-----------------------------------------------------
    data.bin        0x110A0000 ALIGN 8          0x00060000
    {
        ; Any RO-DATA
        .ANY (+RO-DATA)

        ; Any R/W and/or zero initialised data
        .ANY(+RW +ZI)
    }

    ;-----------------------------------------------------
    ; 768 KiB of remaining part of the 1MiB BRAM used as
    ; heap space.
    ;-----------------------------------------------------
    ARM_LIB_HEAP    0x11100000 EMPTY ALIGN 8    0x000C0000
    {}

    ;-----------------------------------------------------
    ; 32 kiB of stack space occupying the DTCM region.
    ;-----------------------------------------------------
    ARM_LIB_STACK   0x30000000 EMPTY ALIGN 8    0x00008000
    {}

    ;-----------------------------------------------------
    ; FPGA internal SRAM of 2MiB - reserved for activation
    ; buffers. The total memory is 4 MiB (we are choosing
    ; to not use the other bank). This region should have
    ; 3 cycle read latency from both CPU and Ethos-U NPU.
    ;-----------------------------------------------------
    isram.bin       0x31000000  UNINIT ALIGN 16 0x00200000
    {
        ; Cache area (if used)
        *.o (.bss.NoInit.ethos_u_cache)

        ; activation buffers a.k.a tensor arena when
        ; memory mode sram only or shared sram
        *.o (.bss.NoInit.activation_buf_sram)
    }
}

;---------------------------------------------------------
; Second load region (DDR)
;---------------------------------------------------------
LOAD_REGION_1       0x70000000                  0x02000000
{
    ;-----------------------------------------------------
    ; 32 MiB of DDR space for neural network model,
    ; input vectors and labels. If the activation buffer
    ; size required by the network is bigger than the
    ; SRAM size available, it is accommodated here.
    ;-----------------------------------------------------
    ddr.bin        0x70000000 ALIGN 16         0x02000000
    {
        ; nn model's baked in input matrices
        *.o (ifm)

        ; nn model's default space
        *.o (nn_model)

        ; labels
        *.o (labels)

        ; activation buffers a.k.a tensor arena when memory mode dedicated sram
        *.o (activation_buf_dram)
    }

    ;-----------------------------------------------------
    ; The following regions are for use by the FVP to
    ; allow loading or dumping of dynamic data into or
    ; from the memory. These regions are mentioned in
    ; the CMake subsystem profile. Do not change the
    ; addresses and sizes below in isolation.
    ;-----------------------------------------------------
    ; 32 MiB of model space for run-time load of model
    ;-----------------------------------------------------
    runtime_model   0x90000000 EMPTY ALIGN 16   0x02000000
    {}

    ;-----------------------------------------------------
    ; 16 MiB of IFM space for run-time loading (FVP only)
    ;-----------------------------------------------------
    runtime_ifm     0x92000000 EMPTY ALIGN 16   0x01000000
    {}

    ;-----------------------------------------------------
    ; 16 MiB of OFM space for run-time loading (FVP only)
    ;-----------------------------------------------------
    runtime_ofm     0x93000000 EMPTY ALIGN 16   0x01000000
    {}
}