add linker script

Author: tact1m4n3

port/raspberrypi/rp2xxx/build.zig

@@ -177,12 +177,15 @@ pub fn init(dep: *std.Build.Dependency) Self {
                 }),
                 .pico_flashless = chip_rp2040.derive(.{
                     .entry = .{ .symbol_name = "_entry_point" },
-                    .linker_script = .{ .generate = .none, .file = b.path("ld/rp2040/ram_image_linker.ld") },
+                    .linker_script = .{
+                        .generate = .none,
+                        .file = b.path("ld/rp2040/ram_image_linker.ld"),
+                    },
                     .ram_image = true,
                     .board = .{
                         .name = "RaspberryPi Pico (ram image)",
                         .url = "https://www.raspberrypi.com/products/raspberry-pi-pico/",
-                        .root_source_file = b.path("src/boards/raspberry_pi_pico2.zig"),
+                        .root_source_file = b.path("src/boards/raspberry_pi_pico.zig"),
                     },
                 }),
                 .pico2_arm = chip_rp2350_arm.derive(.{
@@ -194,6 +197,10 @@ pub fn init(dep: *std.Build.Dependency) Self {
                 }),
                 .pico2_arm_flashless = chip_rp2350_arm.derive(.{
                     .ram_image = true,
+                    .linker_script = .{
+                        .generate = .memory_regions,
+                        .file = b.path("ld/rp2350/arm_ram_image_sections.ld"),
+                    },
                     .board = .{
                         .name = "RaspberryPi Pico 2 (ram image)",
                         .url = "https://www.raspberrypi.com/products/raspberry-pi-pico2/",

port/raspberrypi/rp2xxx/ld/rp2350/arm_ram_image_sections.ld

@@ -0,0 +1,51 @@
+SECTIONS
+{
+  /DISCARD/ :
+  {
+    *(.entry)
+  }
+
+  .flash_start :
+  {
+    KEEP(*(microzig_flash_start))
+  } > ram0
+
+  .bootmeta :
+  {
+    __bootmeta_start__ = .;
+    KEEP(*(.bootmeta))
+    __bootmeta_end__ = .;
+  } > ram0
+
+  .text :
+  {
+     *(.text*)
+     KEEP(*(.ram_text))
+     *(.rodata*)
+  } > ram0
+
+  .ARM.extab : {
+      *(.ARM.extab* .gnu.linkonce.armextab.*)
+  } > ram0
+
+  .ARM.exidx : {
+      *(.ARM.exidx* .gnu.linkonce.armexidx.*)
+  } > ram0
+
+  .data :
+  {
+     *(.data*)
+  } > ram0
+
+  .bss :
+  {
+      *(.bss*)
+  } > ram0
+
+  /* Unused, but set as extern in startup_logic */
+  microzig_data_start = .;
+  microzig_data_end = .;
+  microzig_bss_start = .;
+  microzig_bss_end = .;
+  microzig_data_load_start = .;
+}