Added ROM to RAM code copy & exec with example of how to use it (miniblink_rom_to_ram).

examples/lpc43xx/hackrf-jellybean/jellybean-lpc4330_rom_to_ram.ld

@@ -0,0 +1,35 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
+ * Copyright (C) 2012 Benjamin Vernoux <titanmkd@gmail.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for HackRF Jellybean (LPC4330, 1M SPI flash, 264K SRAM). */
+
+/* Define memory regions. */
+MEMORY
+{
+  /* Physical address in Flash used to copy Code from Flash to RAM */
+  rom_flash (rx)  : ORIGIN = 0x80000000, LENGTH =  1M
+  /* rom is really the shadow region that points to SPI flash or elsewhere */
+  rom (rx)  : ORIGIN = 0x00000000, LENGTH =  1M
+  ram (rwx) : ORIGIN = 0x10000000, LENGTH =  128K
+  /* there are some additional RAM regions */
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_lpc43xx_rom_to_ram.ld

examples/lpc43xx/hackrf-jellybean/miniblink_rom_to_ram/Makefile

@@ -0,0 +1,24 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This library is free software: you can redistribute it and/or modify
+## it under the terms of the GNU Lesser General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public License
+## along with this library.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = miniblink
+
+LDSCRIPT = ../jellybean-lpc4330_rom_to_ram.ld
+
+include ../../Makefile.include

examples/lpc43xx/hackrf-jellybean/miniblink_rom_to_ram/README

@@ -0,0 +1,12 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This is the smallest-possible example program using libopencm3.
+
+It's intended for the Jellybean development board from the HackRF project:
+
+https://github.com/mossmann/hackrf
+
+It should blink LED1 on the board.
+This example copy the Code from ROM to RAM and execute code from RAM.

examples/lpc43xx/hackrf-jellybean/miniblink_rom_to_ram/miniblink.c

@@ -0,0 +1,82 @@
+/*
+* This file is part of the libopencm3 project.
+*
+* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
+* Copyright (C) 2012 Michael Ossmann <mike@ossmann.com>
+*
+* This library is free software: you can redistribute it and/or modify
+* it under the terms of the GNU Lesser General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* This library is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU Lesser General Public License for more details.
+*
+* You should have received a copy of the GNU Lesser General Public License
+* along with this library.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <libopencm3/lpc43xx/gpio.h>
+#include <libopencm3/lpc43xx/scu.h>
+
+#include "../jellybean_conf.h"
+
+void gpio_setup(void)
+{
+	/* Configure SCU Pin Mux as GPIO */
+	scu_pinmux(SCU_PINMUX_LED1, SCU_GPIO_FAST);
+	scu_pinmux(SCU_PINMUX_LED2, SCU_GPIO_FAST);
+	scu_pinmux(SCU_PINMUX_LED3, SCU_GPIO_FAST);
+
+	scu_pinmux(SCU_PINMUX_EN1V8, SCU_GPIO_FAST);
+
+	scu_pinmux(SCU_PINMUX_BOOT0, SCU_GPIO_FAST);
+	scu_pinmux(SCU_PINMUX_BOOT1, SCU_GPIO_FAST);
+	scu_pinmux(SCU_PINMUX_BOOT2, SCU_GPIO_FAST);
+	scu_pinmux(SCU_PINMUX_BOOT3, SCU_GPIO_FAST);
+
+	/* Configure all GPIO as Input (safe state) */
+	GPIO0_DIR = 0;
+	GPIO1_DIR = 0;
+	GPIO2_DIR = 0;
+	GPIO3_DIR = 0;
+	GPIO4_DIR = 0;
+	GPIO5_DIR = 0;
+	GPIO6_DIR = 0;
+	GPIO7_DIR = 0;
+
+	/* Configure GPIO as Output */
+	GPIO2_DIR |= (PIN_LED1|PIN_LED2|PIN_LED3); /* Configure GPIO2[1/2/8] (P4_1/2 P6_12) as output. */
+	GPIO3_DIR |= PIN_EN1V8; /* GPIO3[6] on P6_10  as output. */
+}
+
+u32 boot0, boot1, boot2, boot3;
+
+int main(void)
+{
+	int i;
+	gpio_setup();
+
+	/* Set 1V8 */
+	gpio_set(PORT_EN1V8, PIN_EN1V8);
+
+	/* Blink LED1/2/3 on the board and Read BOOT0/1/2/3 pins. */
+	while (1) 
+	{
+		boot0 = BOOT0_STATE;
+		boot1 = BOOT1_STATE;
+		boot2 = BOOT2_STATE;
+		boot3 = BOOT3_STATE;
+
+		gpio_set(PORT_LED1_3, (PIN_LED1|PIN_LED2|PIN_LED3)); /* LEDs on */
+		for (i = 0; i < 2000000; i++)	/* Wait a bit. */
+			__asm__("nop");
+		gpio_clear(PORT_LED1_3, (PIN_LED1|PIN_LED2|PIN_LED3)); /* LED off */
+		for (i = 0; i < 2000000; i++)	/* Wait a bit. */
+			__asm__("nop");
+	}
+
+	return 0;
+}

lib/lpc43xx/libopencm3_lpc43xx.ld

@@ -3,6 +3,7 @@
  *
  * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
  * Copyright (C) 2012 Michael Ossmann <mike@ossmann.com>
+ * Copyright (C) 2012 Benjamin Vernoux <titanmkd@gmail.com>
  *
  * This library is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Lesser General Public License as published by
@@ -35,6 +36,7 @@ SECTIONS
 
 	.text : {
 		. = ALIGN(0x400);
+		_text_ram = 0; /* Start of Code in RAM NULL because Copy of Code from ROM to RAM disabled */
 		*(.vectors)	/* Vector table */
 		*(.text*)	/* Program code */
 		. = ALIGN(4);
@@ -50,6 +52,8 @@ SECTIONS
 	__exidx_end = .;
 
 	_etext = .;
+	_etext_ram = 0; /* Start of Code in RAM NULL because Copy of Code from ROM to RAM disabled */
+	_etext_rom = 0; /* Start of Code in RAM NULL because Copy of Code from ROM to RAM disabled */
 
 	. = ORIGIN(ram);
 

lib/lpc43xx/libopencm3_lpc43xx_rom_to_ram.ld

@@ -0,0 +1,97 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+ * Copyright (C) 2012 Michael Ossmann <mike@ossmann.com>
+ * Copyright (C) 2012 Benjamin Vernoux <titanmkd@gmail.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Generic linker script for LPC43XX targets using libopencm3. */
+
+/* Memory regions must be defined in the ld script which includes this one. */
+
+/* Enforce emmition of the vector table. */
+EXTERN (vector_table)
+
+/* Define the entry point of the output file. */
+ENTRY(reset_handler)
+
+/* Define sections. */
+SECTIONS
+{
+	. = ORIGIN(rom);
+
+	.text : {
+		. = ALIGN(0x400);
+		_text_ram = . + ORIGIN(ram); /* Start of Code in RAM */
+
+		*(.vectors)	/* Vector table */
+		*(.text*)	/* Program code */
+		. = ALIGN(4);
+		*(.rodata*)	/* Read-only data */
+		. = ALIGN(4);
+	} >rom
+
+	/* exception index - required due to libgcc.a issuing /0 exceptions */
+	__exidx_start = .;
+	.ARM.exidx : {
+		*(.ARM.exidx*)
+	} > rom
+	__exidx_end = .;
+
+	_etext = .;
+	_etext_ram = . + ORIGIN(ram);
+	_etext_rom = . + ORIGIN(rom_flash);
+
+	. = ORIGIN(ram);
+
+	.data : {
+		_data = .;
+		*(.data*)	/* Read-write initialized data */
+		. = ALIGN(4);
+		_edata = .;
+	} >ram AT >rom
+
+	.bss : {
+		*(.bss*)	/* Read-write zero initialized data */
+		*(COMMON)
+		. = ALIGN(4);
+		_ebss = .;
+	} >ram
+
+	/* exception unwind data - required due to libgcc.a issuing /0 exceptions */
+	.ARM.extab : {
+		*(.ARM.extab*)
+	} >ram
+
+	/*
+	 * The .eh_frame section appears to be used for C++ exception handling.
+	 * You may need to fix this if you're using C++.
+	 */
+	/DISCARD/ : { *(.eh_frame) }
+
+	/*
+	 * Another section used by C++ stuff, appears when using newlib with
+	 * 64bit (long long) printf support - discard it for now.
+	 */
+	/DISCARD/ : { *(.ARM.exidx) }
+
+	end = .;
+
+	/* Leave room above stack for IAP to run. */
+	__StackTop = ORIGIN(ram) + LENGTH(ram) - 32;
+	PROVIDE(_stack = __StackTop);
+}

lib/lpc43xx/vector.c

@@ -22,6 +22,7 @@
 
 /* Symbols exported by the linker script(s). */
 extern unsigned _etext, _data, _edata, _ebss, _stack;
+extern unsigned _etext_ram, _text_ram, _etext_rom;
 
 void main(void);
 void reset_handler(void);
@@ -158,11 +159,29 @@ void (*const vector_table[]) (void) = {
 	qei_irqhandler,
 };
 
+#define MMIO32(addr)    (*(volatile unsigned long*)(addr))
+#define CREG_M4MEMMAP   MMIO32( (0x40043000 + 0x100) )
+
 void reset_handler(void)
 {
 	volatile unsigned *src, *dest;
 	__asm__("MSR msp, %0" : : "r"(&_stack));
 
+	/* Copy the code from ROM to Real RAM (if enabled) */
+	if( (&_etext_ram-&_text_ram) > 0 )
+	{
+		src = &_etext_rom-(&_etext_ram-&_text_ram);
+		for(dest = &_text_ram; dest < &_etext_ram; )
+		{
+			*dest++ = *src++;
+		}
+
+		/* Change Shadow memory to Real RAM */
+		CREG_M4MEMMAP = (unsigned long)&_text_ram;
+
+		/* Continue Execution in RAM */
+	}
+
 	for (src = &_etext, dest = &_data; dest < &_edata; src++, dest++)
 		*dest = *src;