Arm backend: Move the portable kernels section to bigger memory

This patch moves the portable kernels from the ITCM to the BRAM
so that we don't overflow on the ITCM when linking the application

Change-Id: Ib6dd5fc97a0fa1138b7702cb23052a7015ff4135

Author: gggekov

examples/arm/ethos-u-setup/core_platform/0003-Move-the-portable-kernels-to-the-BRAM.patch

@@ -0,0 +1,42 @@
+From 81f5bd9092bc25c343d8d85b692698c6d961d0bd Mon Sep 17 00:00:00 2001
+From: George Gekov <[email protected]>
+Date: Mon, 28 Jul 2025 15:23:50 +0100
+Subject: [PATCH] Move the portable kernels to the BRAM
+
+On the Corstone-300, we have 512KB of ITCM and by default,
+the .text section lives in the ITCM. However, as we build more
+portable kernels, we sometimes overflow and the .text section
+no longer fits in the ITCM. This patch moves the portable kernels
+to the BRAM as we have 1MB of BRAM
+---
+ targets/corstone-300/platform.ld | 7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+
+diff --git a/targets/corstone-300/platform.ld b/targets/corstone-300/platform.ld
+index 5043be2..399e9f7 100644
+--- a/targets/corstone-300/platform.ld
++++ b/targets/corstone-300/platform.ld
+@@ -135,7 +135,11 @@ SECTIONS
+   {
+     _vectors = .;
+     KEEP(*(.vectors))
+-    *(.text*)
++    *(EXCLUDE_FILE(
++                  *op_*.cpp.obj
++                   )
++
++    .text*)
+ 
+     KEEP(*(.init))
+     KEEP(*(.fini))
+@@ -299,6 +303,7 @@ SECTIONS
+     __sram_data_start__ = .;
+     *(.sram.data)
+     . = ALIGN(4);
++    *op_*.cpp.obj (*.text*)
+     __sram_data_end__ = .;
+   } > BRAM AT >DDR :rom_dram
+ 
+-- 
+2.39.5 (Apple Git-154)
+