machine/rp2350: add flash support for rp2350 (#4803)

* machine/rp2350: add flash support for rp2350
* combine duplicate files
* clean things up and group by source file
* add stubbed out xip cache clean func if needed in the future
* update flash_enable_xip_via_boot2
* remove unused macros and fix inconsistent formatting
* make flash size configurable like rp2040
* add missing flash size configs
* retain big Go CGo compatibility per #4103
* clarify CS0_SIZE source and remove single-use typedef

targets/pga2350.json

@@ -1,4 +1,7 @@
 {
     "inherits": ["rp2350b"],
-    "build-tags": ["pga2350"]
+    "build-tags": ["pga2350"],
+    "ldflags": [
+        "--defsym=__flash_size=16M"
+    ]
 }

targets/pico2.json

@@ -4,5 +4,8 @@
     ],
     "build-tags": ["pico2"],
     "serial-port": ["2e8a:000A"],
-    "default-stack-size": 8192
+    "default-stack-size": 8192,
+    "ldflags": [
+        "--defsym=__flash_size=4M"
+    ]
 }

targets/rp2350.json

@@ -12,6 +12,9 @@
         "src/device/rp/rp2350.s",
         "targets/rp2350_embedded_block.s"
     ],
+    "ldflags": [
+        "--defsym=__flash_size=2M"
+    ],
     "linkerscript": "targets/rp2350.ld",
     "openocd-interface": "picoprobe",
     "openocd-transport": "swd",

targets/rp2350.ld

@@ -2,7 +2,7 @@
 MEMORY
 {
    /* 2MiB safe default.  */
-    FLASH : ORIGIN = 0x10000000, LENGTH = 2048k
+    FLASH : ORIGIN = 0x10000000, LENGTH = __flash_size
     /* RAM consists of 8 banks, SRAM0..SRAM7 with striped mapping. */
     SRAM : ORIGIN = 0x20000000, LENGTH = 512k
     /* Banks 8 and 9 use direct mapping which can be
@@ -10,7 +10,7 @@ MEMORY
        i.e: Separate stacks for core0 and core1. */
     SRAM4 : ORIGIN = 0x20080000, LENGTH = 4k
     SRAM5 : ORIGIN = 0x20081000, LENGTH = 4k
-    FLASH_TEXT (rx) : ORIGIN = 0x10000000, LENGTH = 2048k
+    FLASH_TEXT (rx) : ORIGIN = 0x10000000, LENGTH = __flash_size
     RAM (rwx)       : ORIGIN = 0x20000000, LENGTH = 512k
 }
 

targets/tiny2350.json

@@ -3,5 +3,8 @@
         "rp2350"
     ],
     "build-tags": ["tiny2350"],
+    "ldflags": [
+        "--defsym=__flash_size=4M"
+    ],
     "serial-port": ["2e8a:000f"]
 }