keyboards/annepro2/ld: Add per-variant linker scripts (#24999)

C18 has an MCU with 16K SRAM, up from C15's 8K.

Split the linker script into C15 and C18 variants to make use of the
larger RAM capacity of C18.

keyboards/annepro2/c15/rules.mk

@@ -4,7 +4,7 @@ ARMV = 6
 USE_FPU = no
 MCU_FAMILY = HT32
 MCU_SERIES = HT32F523xx
-MCU_LDSCRIPT = HT32F52342_ANNEPRO2
+MCU_LDSCRIPT = HT32F52342_ANNEPRO2_C15
 MCU_STARTUP = ht32f523xx
 
 BOARD = ANNEPRO2_C15

keyboards/annepro2/c18/rules.mk

@@ -4,7 +4,7 @@ ARMV = 6
 USE_FPU = no
 MCU_FAMILY = HT32
 MCU_SERIES = HT32F523xx
-MCU_LDSCRIPT = HT32F52342_ANNEPRO2
+MCU_LDSCRIPT = HT32F52352_ANNEPRO2_C18
 MCU_STARTUP = ht32f523xx
 
 BOARD = ANNEPRO2_C18

keyboards/annepro2/ld/HT32F52352_ANNEPRO2_C18.ld

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2013-2016 Fabio UJonathan A. Kollaschtzig, http://fabioutzig.com
+ *           (c) 2020 Yaotian Feng (Codetector) <codetector@codetector.cn>
+ *           (c) 2025 Michał Kopeć <michal@nozomi.space>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/*
+ * HT32F52342 w/ Anne Pro 2 bootloader memory setup.
+ */
+MEMORY {
+    flash0   : org = 0x00004000, len = 64k - 16k       /* firmware */
+    flash1   : org = 0x00000000, len = 0
+    flash2   : org = 0x00000000, len = 0
+    flash3   : org = 0x00000000, len = 0
+    flash4   : org = 0x00000000, len = 0
+    flash5   : org = 0x00000000, len = 0
+    flash6   : org = 0x00000000, len = 0
+    flash7   : org = 0x00000000, len = 0
+    ram0     : org = 0x20000000, len = 16k             /* RAM */
+    ram1     : org = 0x00000000, len = 0
+    ram2     : org = 0x00000000, len = 0
+    ram3     : org = 0x00000000, len = 0
+    ram4     : org = 0x00000000, len = 0
+    ram5     : org = 0x00000000, len = 0
+    ram6     : org = 0x00000000, len = 0
+    ram7     : org = 0x00000000, len = 0
+}
+
+/* For each data/text section two region are defined, a virtual region
+   and a load region (_LMA suffix).*/
+
+/* Flash region to be used for exception vectors.*/
+REGION_ALIAS("VECTORS_FLASH", flash0);
+REGION_ALIAS("VECTORS_FLASH_LMA", flash0);
+
+/* Flash region to be used for constructors and destructors.*/
+REGION_ALIAS("XTORS_FLASH", flash0);
+REGION_ALIAS("XTORS_FLASH_LMA", flash0);
+
+/* Flash region to be used for code text.*/
+REGION_ALIAS("TEXT_FLASH", flash0);
+REGION_ALIAS("TEXT_FLASH_LMA", flash0);
+
+/* Flash region to be used for read only data.*/
+REGION_ALIAS("RODATA_FLASH", flash0);
+REGION_ALIAS("RODATA_FLASH_LMA", flash0);
+
+/* Flash region to be used for various.*/
+REGION_ALIAS("VARIOUS_FLASH", flash0);
+REGION_ALIAS("VARIOUS_FLASH_LMA", flash0);
+
+/* Flash region to be used for RAM(n) initialization data.*/
+REGION_ALIAS("RAM_INIT_FLASH_LMA", flash0);
+
+/* RAM region to be used for Main stack. This stack accommodates the processing
+   of all exceptions and interrupts.*/
+REGION_ALIAS("MAIN_STACK_RAM", ram0);
+
+/* RAM region to be used for the process stack. This is the stack used by
+   the main() function.*/
+REGION_ALIAS("PROCESS_STACK_RAM", ram0);
+
+/* RAM region to be used for data segment.*/
+REGION_ALIAS("DATA_RAM", ram0);
+REGION_ALIAS("DATA_RAM_LMA", flash0);
+
+/* RAM region to be used for BSS segment.*/
+REGION_ALIAS("BSS_RAM", ram0);
+
+/* RAM region to be used for the default heap.*/
+REGION_ALIAS("HEAP_RAM", ram0);
+
+/* Generic rules inclusion.*/
+INCLUDE rules.ld