Merge pull request #2139 from jamesmunns/patch-1

Update RP2040 memory.x
embassy-rs · Nov 19, 2023 · ff2f104 · ff2f104
2 parents e3be0b9 + f3c77e5
commit ff2f104
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diff --git a/examples/boot/application/rp/memory.x b/examples/boot/application/rp/memory.x
@@ -5,7 +5,19 @@ MEMORY
   BOOTLOADER_STATE                  : ORIGIN = 0x10006000, LENGTH = 4K
   FLASH                             : ORIGIN = 0x10007000, LENGTH = 512K
   DFU                               : ORIGIN = 0x10087000, LENGTH = 516K
-  RAM                               : ORIGIN = 0x20000000, LENGTH = 256K
+
+  /* Pick one of the two options for RAM layout     */
+
+  /* OPTION A: Use all RAM banks as one big block   */
+  /* Reasonable, unless you are doing something     */
+  /* really particular with DMA or other concurrent */
+  /* access that would benefit from striping        */
+  RAM   : ORIGIN = 0x20000000, LENGTH = 264K
+
+  /* OPTION B: Keep the unstriped sections separate */
+  /* RAM: ORIGIN = 0x20000000, LENGTH = 256K        */
+  /* SCRATCH_A: ORIGIN = 0x20040000, LENGTH = 4K    */
+  /* SCRATCH_B: ORIGIN = 0x20041000, LENGTH = 4K    */
 }
 
 __bootloader_state_start = ORIGIN(BOOTLOADER_STATE) - ORIGIN(BOOT2);

diff --git a/examples/boot/bootloader/rp/memory.x b/examples/boot/bootloader/rp/memory.x
@@ -6,7 +6,19 @@ MEMORY
   BOOTLOADER_STATE                  : ORIGIN = 0x10006000, LENGTH = 4K
   ACTIVE                            : ORIGIN = 0x10007000, LENGTH = 512K
   DFU                               : ORIGIN = 0x10087000, LENGTH = 516K
-  RAM                               : ORIGIN = 0x20000000, LENGTH = 256K
+
+  /* Pick one of the two options for RAM layout     */
+
+  /* OPTION A: Use all RAM banks as one big block   */
+  /* Reasonable, unless you are doing something     */
+  /* really particular with DMA or other concurrent */
+  /* access that would benefit from striping        */
+  RAM   : ORIGIN = 0x20000000, LENGTH = 264K
+
+  /* OPTION B: Keep the unstriped sections separate */
+  /* RAM: ORIGIN = 0x20000000, LENGTH = 256K        */
+  /* SCRATCH_A: ORIGIN = 0x20040000, LENGTH = 4K    */
+  /* SCRATCH_B: ORIGIN = 0x20041000, LENGTH = 4K    */
 }
 
 __bootloader_state_start = ORIGIN(BOOTLOADER_STATE) - ORIGIN(BOOT2);

diff --git a/examples/rp/memory.x b/examples/rp/memory.x
@@ -1,5 +1,17 @@
 MEMORY {
     BOOT2 : ORIGIN = 0x10000000, LENGTH = 0x100
     FLASH : ORIGIN = 0x10000100, LENGTH = 2048K - 0x100
-    RAM   : ORIGIN = 0x20000000, LENGTH = 256K
-}
+
+    /* Pick one of the two options for RAM layout     */
+
+    /* OPTION A: Use all RAM banks as one big block   */
+    /* Reasonable, unless you are doing something     */
+    /* really particular with DMA or other concurrent */
+    /* access that would benefit from striping        */
+    RAM   : ORIGIN = 0x20000000, LENGTH = 264K
+
+    /* OPTION B: Keep the unstriped sections separate */
+    /* RAM: ORIGIN = 0x20000000, LENGTH = 256K        */
+    /* SCRATCH_A: ORIGIN = 0x20040000, LENGTH = 4K    */
+    /* SCRATCH_B: ORIGIN = 0x20041000, LENGTH = 4K    */
+}