From 7789f9804ebf8e4b2a89b7e1eefff1577f737e13 Mon Sep 17 00:00:00 2001
From: Jörg Hohensohn <hohensoh@rockbox.org>
Date: Wed, 28 Jan 2004 20:43:31 +0000
Subject: preparation for running directly from flash ROM

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4283 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/app.lds |  4 ++++
 firmware/crt0.S  | 19 +++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/firmware/app.lds b/firmware/app.lds
index 83a09a81d0..bacc645044 100644
--- a/firmware/app.lds
+++ b/firmware/app.lds
@@ -117,6 +117,10 @@ SECTIONS
     .data :
     {
         *(.data)
+        . = ALIGN(0x4);
+        _datacopy = .; /* dummy here, only for ROM based */
+        _datastart = .;
+        _dataend  = .;
     } > DRAM
 
     .rodata :
diff --git a/firmware/crt0.S b/firmware/crt0.S
index 99aab83867..088ea0aff4 100644
--- a/firmware/crt0.S
+++ b/firmware/crt0.S
@@ -112,6 +112,19 @@ copy_l:
 	bf	copy_l
 	nop
 
+	/* copy the .data section, for rombased execution */
+	mov.l	datacopy_k,r0
+	mov.l	data_k,r1
+	mov.l	dataend_k,r2
+copy_l2:
+	mov.l	@r0,r3
+	mov.l	r3,@r1
+	add	#4,r0
+	add	#4,r1
+	cmp/ge	r2,r1
+	bf	copy_l2
+	nop
+
 	/* Munge the main thread stack */
 	mov.l	stack_k,r2
 	mov.l	deadbeef_k,r0
@@ -150,6 +163,12 @@ iram_k:
 	.long	_iramstart
 iramend_k:
 	.long	_iramend
+datacopy_k:
+	.long	_datacopy
+data_k:
+	.long	_datastart
+dataend_k:
+	.long	_dataend
 main_k:
 	.long	_main
 vbr_k:
-- 
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