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; 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 ***
; *************************************************************
; Please see docs/sections/appendix.md for memory mapping information.
;
; Note: Ethos-U55 can access BRAM, internal SRAM and the DDR sections => activation buffers and
; the model should only be placed in those regions.
;
;---------------------------------------------------------
; First load region (ITCM)
;---------------------------------------------------------
LOAD_REGION_0 0x00000000 0x00080000
{
;-----------------------------------------------------
; First part of code mem - 512kiB
;-----------------------------------------------------
itcm.bin 0x00000000 0x00080000
{
*.o (RESET, +First)
* (InRoot$$Sections)
; Essentially only RO-CODE, RO-DATA is in a
; different region.
.ANY (+RO)
}
;-----------------------------------------------------
; 128kiB of 512kiB DTCM is used for any other RW or ZI
; data. Note: this region is internal to the Cortex-M
; CPU.
;-----------------------------------------------------
dtcm.bin 0x20000000 0x00020000
{
; Any R/W and/or zero initialised data
.ANY(+RW +ZI)
}
;-----------------------------------------------------
; 384kiB of stack space within the DTCM region. See
; `dtcm.bin` for the first section. Note: by virtue of
; being part of DTCM, this region is only accessible
; from Cortex-M55.
;-----------------------------------------------------
ARM_LIB_STACK 0x20020000 EMPTY ALIGN 8 0x00060000
{}
;-----------------------------------------------------
; SSE-300's internal SRAM of 4MiB - reserved for
; activation buffers.
; This region should have 3 cycle read latency from
; both Cortex-M55 and Ethos-U55
;-----------------------------------------------------
isram.bin 0x31000000 UNINIT ALIGN 16 0x00400000
{
; activation buffers a.k.a tensor arena
*.o (.bss.NoInit.activation_buf)
}
}
;---------------------------------------------------------
; Second load region (DDR)
;---------------------------------------------------------
LOAD_REGION_1 0x70000000 0x02000000
{
;-----------------------------------------------------
; 32 MiB of DRAM 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.
;-----------------------------------------------------
dram.bin 0x70000000 ALIGN 16 0x02000000
{
; nn model's baked in input matrices
*.o (ifm)
; nn model
*.o (nn_model)
; labels
*.o (labels)
; if the activation buffer (tensor arena) doesn't
; fit in the SRAM region, we accommodate it here
*.o (activation_buf)
}
;-----------------------------------------------------
; First 256kiB of BRAM (FPGA SRAM) used for RO data.
; Note: Total BRAM size available is 2MiB.
;-----------------------------------------------------
bram.bin 0x11000000 ALIGN 8 0x00040000
{
; RO data (incl. unwinding tables for debugging)
.ANY (+RO-DATA)
}
;-----------------------------------------------------
; Remaining part of the 2MiB BRAM used as heap space.
; 0x00200000 - 0x00040000 = 0x001C0000 (1.75 MiB)
;-----------------------------------------------------
ARM_LIB_HEAP 0x11040000 EMPTY ALIGN 8 0x001C0000
{}
}
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