add new RUN_FROM_RAM run-mode for direct DFU-to-RAM support

4 files changed, 99 insertions, 3 deletions

diff --git a/firmware/Makefile b/firmware/Makefile
index b085c33..68ff85f 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -49,7 +49,7 @@ USE_THUMB_MODE = NO
 #USE_THUMB_MODE = YES
 
 ## Create ROM-Image (final)
-RUN_MODE=RUN_FROM_ROM
+RUN_MODE:=RUN_FROM_ROM
 ## Create RAM-Image (debugging) - not used in this example
 #RUN_MODE=RUN_FROM_RAM
 
@@ -319,7 +319,7 @@ LDFLAGS += -Wl,--gc-sections -Wl,--entry=_startup
 
 # Set Linker-Script Depending On Selected Memory and Controller
 ifeq ($(RUN_MODE),RUN_FROM_RAM)
-LDFLAGS +=-T$(PATH_TO_LINKSCRIPTS)$(SUBMDL)-RAM.ld
+LDFLAGS +=-T$(PATH_TO_LINKSCRIPTS)$(SUBMDL)-RAM$(IMGTYPE).ld
 else 
 LDFLAGS +=-T$(PATH_TO_LINKSCRIPTS)$(SUBMDL)-ROM$(IMGTYPE).ld
 endif
diff --git a/firmware/link/AT91SAM7S128-RAM-sam7dfu-app.ld b/firmware/link/AT91SAM7S128-RAM-sam7dfu-app.ld
new file mode 100644
index 0000000..674ee00
--- /dev/null
+++ b/firmware/link/AT91SAM7S128-RAM-sam7dfu-app.ld
@@ -0,0 +1,94 @@
+/* Memory Definitions */
+
+MEMORY
+{
+  /* reserve 16K DFU area on top  of flash */
+  /* FLASH  (rx) : ORIGIN = 0x00104000, LENGTH = (0x00020000 - 0x4000 - 0x400) */
+  /* reserve 1k DFU area on top of RAM */
+  DATA   (rw) : ORIGIN = 0x00200400, LENGTH = (0x00008000 - 0x400)
+  STACK  (rw) : ORIGIN = 0x00208000, LENGTH = 0x00000000
+}
+
+
+/* Section Definitions */
+
+SECTIONS
+{
+	. = 0x00000000;
+	/* first section is .text which is used for code */
+	.text 0x00200400: AT ( 0x00000000 ) { 
+  		src/start/Cstartup_app.o (.text)
+		* (.text)
+		* (.rodata*)
+  		. = ALIGN(4);
+
+  	_etext = . ;
+	PROVIDE (etext = .);
+
+  		_data = . ;
+		* (.fastrun)
+  		* (.data)
+  		. = ALIGN(4);
+  	} >DATA
+
+  	_edata = . ;
+	PROVIDE (edata = .);
+
+	/* .bss section which is used for uninitialized data */
+	.bss : {
+		__bss_start = . ;
+		__bss_start__ = . ;
+		*(.bss)
+		*(COMMON)
+	} >DATA
+
+	. = ALIGN(4);
+	__bss_end__ = . ;
+	__bss_end__ = . ;
+
+	PROVIDE (main = .);
+
+	_end = . ;
+
+	. = ALIGN(4);
+	.int_data : { 
+		*(.internal_ram_top) 
+   	} >STACK 
+
+	PROVIDE (end = .);
+
+  /* Stabs debugging sections.  */
+  .stab          0 : { *(.stab) }
+  .stabstr       0 : { *(.stabstr) }
+  .stab.excl     0 : { *(.stab.excl) }
+  .stab.exclstr  0 : { *(.stab.exclstr) }
+  .stab.index    0 : { *(.stab.index) }
+  .stab.indexstr 0 : { *(.stab.indexstr) }
+  .comment       0 : { *(.comment) }
+  /* DWARF debug sections.
+     Symbols in the DWARF debugging sections are relative to the beginning
+     of the section so we begin them at 0.  */
+  /* DWARF 1 */
+  .debug          0 : { *(.debug) }
+  .line           0 : { *(.line) }
+  /* GNU DWARF 1 extensions */
+  .debug_srcinfo  0 : { *(.debug_srcinfo) }
+  .debug_sfnames  0 : { *(.debug_sfnames) }
+  /* DWARF 1.1 and DWARF 2 */
+  .debug_aranges  0 : { *(.debug_aranges) }
+  .debug_pubnames 0 : { *(.debug_pubnames) }
+  /* DWARF 2 */
+  .debug_info     0 : { *(.debug_info .gnu.linkonce.wi.*) }
+  .debug_abbrev   0 : { *(.debug_abbrev) }
+  .debug_line     0 : { *(.debug_line) }
+  .debug_frame    0 : { *(.debug_frame) }
+  .debug_str      0 : { *(.debug_str) }
+  .debug_loc      0 : { *(.debug_loc) }
+  .debug_macinfo  0 : { *(.debug_macinfo) }
+  /* SGI/MIPS DWARF 2 extensions */
+  .debug_weaknames 0 : { *(.debug_weaknames) }
+  .debug_funcnames 0 : { *(.debug_funcnames) }
+  .debug_typenames 0 : { *(.debug_typenames) }
+  .debug_varnames  0 : { *(.debug_varnames) }
+
+}
diff --git a/firmware/src/os/req_ctx.c b/firmware/src/os/req_ctx.c
index 0e4816e..cc8d57b 100644
--- a/firmware/src/os/req_ctx.c
+++ b/firmware/src/os/req_ctx.c
@@ -28,7 +28,7 @@
 
 /* FIXME: locking, FIFO order processing */
 
-#ifdef __AT91SAM7S64__
+#if defined(__AT91SAM7S64__) || defined(RUN_FROM_RAM)
 #define NUM_RCTX_SMALL 16
 #define NUM_RCTX_LARGE 1
 #else
diff --git a/firmware/src/start/Cstartup_app.S b/firmware/src/start/Cstartup_app.S
index 448cc93..197be66 100644
--- a/firmware/src/start/Cstartup_app.S
+++ b/firmware/src/start/Cstartup_app.S
@@ -79,6 +79,7 @@
 	.global	_startup
 	.func _startup
 _startup:
+#ifndef RUN_FROM_RAM
 	/* Relocate .data section (copy from Flash to RAM) */
 	ldr	r1, =_etext
 	ldr	r2, =_data
@@ -87,6 +88,7 @@ loop_r:	cmp	r2, r3
 	ldrlo	r0, [r1], #4
 	strlo	r0, [r2], #4
 	blo	loop_r
+#endif
 
 	/* Clear .bss section (Zero init) */
 	mov	r0, #0