Merge branch 'usrp1' into next

1 files changed, 78 insertions, 0 deletions

diff --git a/firmware/fx2/src/common/_startup.a51.brittle b/firmware/fx2/src/common/_startup.a51.brittle
new file mode 100644
index 000000000..2996275cf
--- /dev/null
+++ b/firmware/fx2/src/common/_startup.a51.brittle
@@ -0,0 +1,78 @@
+;;; -*- asm -*-
+;;;
+;;; Copyright 2003 Free Software Foundation, Inc.
+;;; 
+;;; This file is part of GNU Radio
+;;; 
+;;; GNU Radio is free software; you can redistribute it and/or modify
+;;; it under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3, or (at your option)
+;;; any later version.
+;;; 
+;;; GNU Radio 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 General Public License for more details.
+;;; 
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Radio; see the file COPYING.  If not, write to
+;;; the Free Software Foundation, Inc., 51 Franklin Street,
+;;; Boston, MA 02110-1301, USA.
+
+    
+;;; The default external memory initialization provided by sdcc is not
+;;; appropriate to the FX2.  This is derived from the sdcc code, but uses 
+;;; the FX2 specific _MPAGE sfr.
+
+
+	.area XISEG   (XDATA)	; the initialized external data area
+	.area XINIT   (CODE)	; the code space consts to init XISEG
+	.area XSEG    (XDATA)	; zero initialized xdata
+	.area USBDESCSEG (XDATA); usb descriptors
+
+	
+	;; BIG TIME KLUDGE!
+	;; Look at usrp_main.rst and count the bytes from our
+	;; "normal return location" to the first instruction following
+	;; the comment:	"_mcs51_getRAMCLEAR () start"
+	
+	INSTRUCTION_BYTES_TO_SKIP = 0x29	 ; valid for sdcc 2.4.0 
+	
+
+	.area CSEG    (CODE)
+
+	;; sfr that sets upper address byte of MOVX using @r0 or @r1
+	_MPAGE	=	0x0092
+
+__sdcc_external_startup::
+;	_mcs51_genXINIT() start
+	mov	r1,#l_XINIT
+	mov	a,r1
+	orl	a,#(l_XINIT >> 8)
+	jz	00003$
+	mov	r2,#((l_XINIT+255) >> 8)
+	mov	dptr,#s_XINIT
+	mov	r0,#s_XISEG
+	mov	_MPAGE,#(s_XISEG >> 8)
+00001$:	clr	a
+	movc	a,@a+dptr
+	movx	@r0,a
+	inc	dptr
+	inc	r0
+	cjne	r0,#0,00002$
+	inc	_MPAGE
+00002$:	djnz	r1,00001$
+	djnz	r2,00001$
+	mov	_MPAGE,#0xFF
+00003$:
+
+	;; Danger! Total KLUDGE!
+	;; We pop the return address, add a magic number to it
+	;; then jump to that address.  Believe it or not, this
+	;; looks like the least kludgy way to handle this,
+	;; short of patching the compiler...
+
+	pop	dph
+	pop	dpl
+	mov	a,#INSTRUCTION_BYTES_TO_SKIP
+	jmp	@a+dptr