From 039370485ddebb125949e8334eae8f9c590cc325 Mon Sep 17 00:00:00 2001
From: Robin Mueller <muellerr@irs.uni-stuttgart.de>
Date: Mon, 20 May 2024 13:54:57 +0200
Subject: [PATCH] low-level stuff

---
 embedded-examples/stm32h7-rtic/memory.x | 121 +++++++++++++++++++++++-
 1 file changed, 118 insertions(+), 3 deletions(-)

diff --git a/embedded-examples/stm32h7-rtic/memory.x b/embedded-examples/stm32h7-rtic/memory.x
index a76c320..76ce2ce 100644
--- a/embedded-examples/stm32h7-rtic/memory.x
+++ b/embedded-examples/stm32h7-rtic/memory.x
@@ -1,4 +1,119 @@
-MEMORY {
-  FLASH : ORIGIN = 0x08000000, LENGTH = 512K
-  RAM : ORIGIN = 0x20000000, LENGTH = 64K
+/* Taken from https://github.com/stm32-rs/stm32h7xx-hal/pull/299, adapted slightly to work with */
+/* flip-link */
+MEMORY
+{
+  /* This file is intended for parts in the STM32H743/743v/753/753v families (RM0433), */
+  /* with the exception of the STM32H742/742v parts which have a different RAM layout. */
+  /* - FLASH and RAM are mandatory memory sections.                                    */
+  /* - The sum of all non-FLASH sections must add to 1060K total device RAM.           */
+  /* - The FLASH section size must match your device, see table below.                 */
+
+  /* FLASH */
+  /* Flash is divided in two independent banks (except 750xB). */
+  /* Select the appropriate FLASH size for your device.        */
+  /* - STM32H750xB                          128K (only FLASH1) */
+  /* - STM32H750xB                            1M (512K + 512K) */
+  /* - STM32H743xI/753xI                      2M (  1M +   1M) */
+  FLASH1 : ORIGIN = 0x08000000, LENGTH = 1M
+  FLASH2  : ORIGIN = 0x08100000, LENGTH = 1M
+
+  /* Data TCM  */
+  /* - Two contiguous 64KB RAMs.                                     */
+  /* - Used for interrupt handlers, stacks and general RAM.          */
+  /* - Zero wait-states.                                             */
+  /* - The DTCM is taken as the origin of the base ram. (See below.) */
+  /*   This is also where the interrupt table and such will live,    */
+  /*   which is required for deterministic performance.              */
+  /* Need a region called RAM */
+  /* DTCM : ORIGIN = 0x20000000, LENGTH = 128K */
+  RAM : ORIGIN = 0x20000000, LENGTH = 128K
+
+  /* Instruction TCM */
+  /* - Used for latency-critical interrupt handlers etc. */
+  /* - Zero wait-states.                                 */
+  ITCM    : ORIGIN = 0x00000000, LENGTH = 64K
+
+  /* AXI SRAM */
+  /* - AXISRAM is in D1 and accessible by all system masters except BDMA. */
+  /* - Suitable for application data not stored in DTCM.                  */
+  /* - Zero wait-states.                                                  */
+  AXISRAM : ORIGIN = 0x24000000, LENGTH = 512K
+
+  /* AHB SRAM */
+  /* - SRAM1-3 are in D2 and accessible by all system masters except BDMA.   */
+  /*   Suitable for use as DMA buffers.                                      */
+  /* - SRAM4 is in D3 and additionally accessible by the BDMA. Used for BDMA */
+  /*   buffers, for storing application data in lower-power modes.           */
+  /* - Zero wait-states.                                                     */
+  SRAM1   : ORIGIN = 0x30000000, LENGTH = 128K
+  SRAM2   : ORIGIN = 0x30020000, LENGTH = 128K
+  SRAM3   : ORIGIN = 0x30040000, LENGTH = 32K
+  SRAM4   : ORIGIN = 0x38000000, LENGTH = 64K
+
+  /* Backup SRAM */
+  BSRAM   : ORIGIN = 0x38800000, LENGTH = 4K
 }
+
+/*
+/* Assign the memory regions defined above for use. */
+/*
+
+/* Provide the mandatory FLASH and RAM definitions for cortex-m-rt's linker script. */
+/* These do not work with flip-link */
+REGION_ALIAS(FLASH, FLASH1);
+/* REGION_ALIAS(RAM,   DTCM); */
+
+/* The location of the stack can be overridden using the `_stack_start` symbol. */
+/* - Set the stack location at the end of RAM, using all remaining space.       */
+_stack_start = ORIGIN(RAM) + LENGTH(RAM);
+
+/* The location of the .text section can be overridden using the  */
+/* `_stext` symbol. By default it will place after .vector_table. */
+/* _stext = ORIGIN(FLASH) + 0x40c; */
+
+/* Define sections for placing symbols into the extra memory regions above.   */
+/* This makes them accessible from code.                                      */
+/* - ITCM, DTCM and AXISRAM connect to a 64-bit wide bus -> align to 8 bytes. */
+/* - All other memories     connect to a 32-bit wide bus -> align to 4 bytes. */
+SECTIONS {
+  .flash2 (NOLOAD) : ALIGN(4) {
+    *(.flash2 .flash2.*);
+    . = ALIGN(4);
+    } > FLASH2
+
+  .itcm (NOLOAD) : ALIGN(8) {
+    *(.itcm .itcm.*);
+    . = ALIGN(8);
+    } > ITCM
+
+  .axisram (NOLOAD) : ALIGN(8) {
+    *(.axisram .axisram.*);
+    . = ALIGN(8);
+    } > AXISRAM
+
+  .sram1 (NOLOAD) : ALIGN(8) {
+    *(.sram1 .sram1.*);
+    . = ALIGN(4);
+    } > SRAM1
+
+  .sram2 (NOLOAD) : ALIGN(8) {
+    *(.sram2 .sram2.*);
+    . = ALIGN(4);
+    } > SRAM2
+
+  .sram3 (NOLOAD) : ALIGN(4) {
+    *(.sram3 .sram3.*);
+    . = ALIGN(4);
+    } > SRAM3
+
+  .sram4 (NOLOAD) : ALIGN(4) {
+    *(.sram4 .sram4.*);
+    . = ALIGN(4);
+    } > SRAM4
+
+  .bsram (NOLOAD) : ALIGN(4) {
+    *(.bsram .bsram.*);
+    . = ALIGN(4);
+    } > BSRAM
+
+};