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https://github.com/tillitis/tillitis-key1.git
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8f2f312531
In order to be able to leave data for firmware signalling the intention with a reset or to leave data for the next app in a chain of apps, we introduce a part of FW_RAM that can be used to store this data. In order to do this, we: - Change size of ROM from 6 KB to 8 KB. - Change size of FW_RAM, from 2 KB to 4 KB. - Add RESETINFO memory partition inside FW_RAM. - Add generation of map file. - Change CFLAGS from using -O2 to using -Os. - Update address ranges for valid access to ROM and FW_RAM. - Move stack to be located before data+bss and the RESETINFO data above them. This also means we introduce hardware stack overflow protection through the Security Monitor. - Revise firmware README to the new use of FW_RAM.
88 lines
1.8 KiB
Plaintext
88 lines
1.8 KiB
Plaintext
/*
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* Copyright (C) 2022, 2023 - Tillitis AB
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* SPDX-License-Identifier: GPL-2.0-only
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*/
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OUTPUT_ARCH("riscv")
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ENTRY(_start)
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/* Define stack size */
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STACK_SIZE = 0xEF0; /* 3824 B */
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MEMORY
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{
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ROM (rx) : ORIGIN = 0x00000000, LENGTH = 0x2000 /* 8 KB */
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FWRAM (rw) : ORIGIN = 0xd0000000, LENGTH = 0xF00 /* 3840 B */
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RESETINFO (rw) : ORIGIN = 0xd0000F00, LENGTH = 0x100 /* 256 B (part of FW_RAM area) */
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RAM (rwx) : ORIGIN = 0x40000000, LENGTH = 0x20000 /* 128 KB */
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}
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SECTIONS
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{
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.text.init :
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{
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*(.text.init)
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} >ROM
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.htif :
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{
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. = ALIGN(0x00000000);
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*(.htif)
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} >ROM
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.text :
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{
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. = ALIGN(4);
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_stext = .;
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*(.text) /* .text sections (code) */
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*(.text*) /* .text* sections (code) */
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*(.rodata) /* .rodata sections (constants, strings, etc.) */
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*(.rodata*) /* .rodata* sections (constants, strings, etc.) */
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*(.srodata) /* .srodata sections (constants, strings, etc.) */
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*(.srodata*) /* .srodata* sections (constants, strings, etc.) */
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. = ALIGN(4);
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_etext = .;
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} >ROM
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.stack (NOLOAD) :
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{
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. = ALIGN(16);
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_sstack = .;
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. += STACK_SIZE;
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. = ALIGN(16);
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_estack = .;
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} >FWRAM
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.data :
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{
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. = ALIGN(4);
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_sdata = .;
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*(.data) /* .data sections */
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*(.data*) /* .data* sections */
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*(.sdata) /* .sdata sections */
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*(.sdata*) /* .sdata* sections */
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. = ALIGN(4);
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_edata = .;
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} >FWRAM AT>ROM
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_sidata = LOADADDR(.data);
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/* Uninitialized data section */
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.bss :
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{
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. = ALIGN(4);
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_sbss = .;
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*(.bss)
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*(.bss*)
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*(.sbss)
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*(.sbss*)
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*(COMMON)
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. = ALIGN(4);
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_ebss = .;
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} >FWRAM
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}
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_sfwram = ORIGIN(FWRAM);
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_efwram = ORIGIN(FWRAM) + LENGTH(FWRAM);
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_sresetinfo = ORIGIN(RESETINFO);
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_eresetinfo = ORIGIN(RESETINFO) + LENGTH(RESETINFO);
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