Mar 19, 2020 · Mar 4, 2020
diff --git a/platform.txt b/platform.txt
 recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{archive_file_path}" "{object_file}"

 ## Combine gc-sections, archives, and objects
 recipe.c.combine.pattern="{compiler.path}{compiler.c.elf.cmd}" {compiler.c.elf.flags} "-T{build.variant.path}/{build.ldscript}" "-Wl,-Map,{build.path}/{build.project_name}.map" {compiler.c.elf.extra_flags} {compiler.ldflags} {compiler.arm.cmsis.ldflags} -o "{build.path}/{build.project_name}.elf" "-L{build.path}" -Wl,--start-group {object_files} {compiler.libraries.ldflags} "{archive_file_path}" -lc -Wl,--end-group -lm -lgcc -lstdc++
 recipe.c.combine.pattern="{compiler.path}{compiler.c.elf.cmd}" {compiler.c.elf.flags} "-Wl,--default-script={build.variant.path}/{build.ldscript}" "-Wl,--script={build.system.path}/ldscript.ld" "-Wl,-Map,{build.path}/{build.project_name}.map" {compiler.c.elf.extra_flags} {compiler.ldflags} {compiler.arm.cmsis.ldflags} -o "{build.path}/{build.project_name}.elf" "-L{build.path}" -Wl,--start-group {object_files} {compiler.libraries.ldflags} "{archive_file_path}" -lc -Wl,--end-group -lm -lgcc -lstdc++

 ## Create output (.bin file)
 recipe.objcopy.bin.pattern="{compiler.path}{compiler.objcopy.cmd}" {compiler.elf2bin.flags} {compiler.elf2bin.extra_flags} "{build.path}/{build.project_name}.elf" "{build.path}/{build.project_name}.bin"
 ## Compute size
 recipe.size.pattern="{compiler.path}{compiler.size.cmd}" -A "{build.path}/{build.project_name}.elf"
 recipe.size.regex=^(?:\.text|\.data|\.rodata)\s+([0-9]+).*
 recipe.size.regex.data=^(?:\.data|\.bss)\s+([0-9]+).*
 recipe.size.regex.data=^(?:\.data|\.bss|\.noinit)\s+([0-9]+).*
 recipe.size.regex.eeprom=^(?:\.eeprom)\s+([0-9]+).*


diff --git a/system/ldscript.ld b/system/ldscript.ld
 /*
 * This script extends the default linker script to add a .noinit
 * section. This section is just mapped to RAM, but it is emitted
 * separately from the .data and .bss sections (both of which are
 * initialized by startup code), so any variables in this section are
 * untouched on startup (so they survive across resets).
 *
 * This script is intended to supplied to the linker's -T / --script
 * option as the primary linker script. When the linker sees an INSERT
 * command, this will cause it to *also* read the default linker script
 * (after reading this script) and then executing the INSERT commands
 * after both scripts have been read.
 *
 * Note that parsing of linker scripts is a bit peculiar, e.g. INSERT
 * does not textually inserts, it inserts any generated output sections.
 * Also, because this script is read *first*, we cannot refer to things
 * in the default script. In particular, it would make sense to add >
 * RAM to the output section below to ensure that the section is mapped
 * into RAM, but the RAM region is not defined yet (I think it would
 * work though, but produces warnings). Instead, we just rely on the
 * defaults used by the linker: If no region is defined for an output
 * section, it will just map to first address after the previous section
 * (.bss in this case, which is fine).
 */
 SECTIONS
 {
  /* Define a noinit output section and mark it as NOLOAD to prevent
   * putting its contents into the resulting .bin file (which is the
   * default). */
  .noinit (NOLOAD) :
  {
    /* Ensure output is aligned */
    . = ALIGN(4);
    /* Define a global _snoinit (and _enoinit below) symbol just in case
     * code wants to iterate over all noinit variables for some reason */
    _snoinit = .;
    /* Actually import the .noinit and .noinit* import sections */
    *(.noinit)
    *(.noinit*)
    . = ALIGN(4);
    _enoinit = .;
  }
 }
 INSERT AFTER .bss;
Original file line number	Diff line number	Diff line change
Expand Up		@@ -128,7 +128,7 @@ recipe.S.o.pattern="{compiler.path}{compiler.S.cmd}" {compiler.S.flags} {build.i
		recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{archive_file_path}" "{object_file}"

		## Combine gc-sections, archives, and objects
		recipe.c.combine.pattern="{compiler.path}{compiler.c.elf.cmd}" {compiler.c.elf.flags} "-T{build.variant.path}/{build.ldscript}" "-Wl,-Map,{build.path}/{build.project_name}.map" {compiler.c.elf.extra_flags} {compiler.ldflags} {compiler.arm.cmsis.ldflags} -o "{build.path}/{build.project_name}.elf" "-L{build.path}" -Wl,--start-group {object_files} {compiler.libraries.ldflags} "{archive_file_path}" -lc -Wl,--end-group -lm -lgcc -lstdc++
		recipe.c.combine.pattern="{compiler.path}{compiler.c.elf.cmd}" {compiler.c.elf.flags} "-Wl,--default-script={build.variant.path}/{build.ldscript}" "-Wl,--script={build.system.path}/ldscript.ld" "-Wl,-Map,{build.path}/{build.project_name}.map" {compiler.c.elf.extra_flags} {compiler.ldflags} {compiler.arm.cmsis.ldflags} -o "{build.path}/{build.project_name}.elf" "-L{build.path}" -Wl,--start-group {object_files} {compiler.libraries.ldflags} "{archive_file_path}" -lc -Wl,--end-group -lm -lgcc -lstdc++

		## Create output (.bin file)
		recipe.objcopy.bin.pattern="{compiler.path}{compiler.objcopy.cmd}" {compiler.elf2bin.flags} {compiler.elf2bin.extra_flags} "{build.path}/{build.project_name}.elf" "{build.path}/{build.project_name}.bin"
Expand All		@@ -147,7 +147,7 @@ recipe.output.save_file={build.project_name}.{build.variant}.hex
		## Compute size
		recipe.size.pattern="{compiler.path}{compiler.size.cmd}" -A "{build.path}/{build.project_name}.elf"
		recipe.size.regex=^(?:\.text\|\.data\|\.rodata)\s+([0-9]+).*
		recipe.size.regex.data=^(?:\.data\|\.bss)\s+([0-9]+).*
		recipe.size.regex.data=^(?:\.data\|\.bss\|\.noinit)\s+([0-9]+).*
		recipe.size.regex.eeprom=^(?:\.eeprom)\s+([0-9]+).*


Expand Down
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,44 @@
		/*
		* This script extends the default linker script to add a .noinit
		* section. This section is just mapped to RAM, but it is emitted
		* separately from the .data and .bss sections (both of which are
		* initialized by startup code), so any variables in this section are
		* untouched on startup (so they survive across resets).
		*
		* This script is intended to supplied to the linker's -T / --script
		* option as the primary linker script. When the linker sees an INSERT
		* command, this will cause it to also read the default linker script
		* (after reading this script) and then executing the INSERT commands
		* after both scripts have been read.
		*
		* Note that parsing of linker scripts is a bit peculiar, e.g. INSERT
		* does not textually inserts, it inserts any generated output sections.
		* Also, because this script is read first, we cannot refer to things
		* in the default script. In particular, it would make sense to add >
		* RAM to the output section below to ensure that the section is mapped
		* into RAM, but the RAM region is not defined yet (I think it would
		* work though, but produces warnings). Instead, we just rely on the
		* defaults used by the linker: If no region is defined for an output
		* section, it will just map to first address after the previous section
		* (.bss in this case, which is fine).
		*/
		SECTIONS
		{
		/* Define a noinit output section and mark it as NOLOAD to prevent
		* putting its contents into the resulting .bin file (which is the
		* default). */
		.noinit (NOLOAD) :
		{
		/* Ensure output is aligned */
		. = ALIGN(4);
		/* Define a global _snoinit (and _enoinit below) symbol just in case
		* code wants to iterate over all noinit variables for some reason */
		_snoinit = .;
		/* Actually import the .noinit and .noinit* import sections */
		*(.noinit)
		(.noinit)
		. = ALIGN(4);
		_enoinit = .;
		}
		}
		INSERT AFTER .bss;