From c107bf29a234bf80a7762e838628ac613456f838 Mon Sep 17 00:00:00 2001
From: Bernard Blackham <dagobah@ucc.asn.au>
Date: Wed, 23 Jun 2004 15:21:48 +0000
Subject: [PATCH] A different way of storing the ROM image.

---
 ROM2/Makefile     |  9 +++++----
 ROM2/main_basic.c | 21 +++++++++++++++------
 ROM2/memory.x     |  5 ++---
 ROM2/src2asm.pl   | 32 ++++++++++++++++++++++++++++++++
 ROM2/src2c.pl     | 17 -----------------
 5 files changed, 54 insertions(+), 30 deletions(-)
 create mode 100644 ROM2/src2asm.pl
 delete mode 100644 ROM2/src2c.pl

diff --git a/ROM2/Makefile b/ROM2/Makefile
index ac77ee3..38780bf 100644
--- a/ROM2/Makefile
+++ b/ROM2/Makefile
@@ -41,7 +41,7 @@ rom2.elf: $(OBJS) memory.x
 	$(SIZE) $@
 
 clean:
-	rm -f *.o *.elf *.s19 *.b *.a rom.tar.bz2 romsrc.c crctab.h m68hc11-gdb gencrctab
+	rm -f *.o *.elf *.s19 *.b *.a rom.tar.bz2 romsrc.s crctab.h m68hc11-gdb gencrctab
 
 #
 # Some useful rules
@@ -53,11 +53,11 @@ size:   rom2.s19
 	$(SIZE) $<
 
 rom.tar.bz2:
-	rm -f romsrc.c crctab.h
+	rm -f romsrc.s crctab.h
 	tar cjf rom.tar.bz2 README Makefile gdbsimrc *.pl *.c *.h *.s *.x
 
-romsrc.c: rom.tar.bz2
-	perl -w src2c.pl < $< > $@
+romsrc.s: rom.tar.bz2 src2asm.pl
+	perl -w src2asm.pl < $< > $@
 
 xmodem.c: crctab.h
 
@@ -82,6 +82,7 @@ crctab.h: gencrctab
 .elf.b:
 	$(OBJCOPY) --output-target=binary --gap-fill=255 \
                    $(OBJCOPY_FLAGS) $< $*.b
+	@perl -e '$$sum = 0;while(read STDIN, $$a, 1){$$sum += ord($$a); $$sum = $$sum&0xffff;} printf "Checksum is \%x\n", $$sum' < $@
 
 m68hc11-gdb: /usr/bin/m68hc11-gdb
 	sed -e 's|m68hc11eepr/reg 0xb000 512|m68hc11eepr/reg 0x4000 1  |' < $< > $@
diff --git a/ROM2/main_basic.c b/ROM2/main_basic.c
index 1165326..8d86585 100644
--- a/ROM2/main_basic.c
+++ b/ROM2/main_basic.c
@@ -324,6 +324,9 @@ void getrom() {
 	send_string("Writing to serial port (maybe). Size is 0x");
 	send_string(u82hex(_rom_src_len >> 8));
 	send_string(u82hex(_rom_src_len & 0xff));
+	send_string("@0x");
+	send_string(u82hex((u16)(&_rom_src_data) >> 8));
+	send_string(u82hex((u16)(&_rom_src_data) & 0xff));
 	send_string(" with signature ");
 	s[0] = _rom_src_data[0];
 	s[1] = _rom_src_data[1];
@@ -333,7 +336,10 @@ void getrom() {
 	send_string(CRLF " Type YES to download rom.tar.bz2 via XMODEM: ");
 	msg_clr();
 	while (!sci_have_packet); /* spin */
-	if (!my_strncmp("YES", (char*)sci_rx_buf, 3)) return;
+	if (!my_strncmp("YES", (char*)sci_rx_buf, 3)) {
+		send_string(CRLF "Transfer cancelled." CRLF);
+		return;
+	}
 
 	sci_init();
 	sci_doing_xmodem = 1;
@@ -346,16 +352,19 @@ void getrom() {
 	char *end = (char*)_rom_src_data+_rom_src_len;
 	bool aborted = 0;
 	while (1) {
-		if (!xmodem_send_packet((char*)p, 128)) {
-			aborted = 1;
-			break;
-		}
-		p += 128;
 		if (p + 128 > end) {
 			/* send partial packet */
 			if (!xmodem_send_packet((char*)p, end-p)) aborted = 1;
 			break;
+		} if ((u16)p == 0xb600) {
+			/* we have an eeprom here. skip it. */
+			p += 0x0200;
+			continue;
+		} else if (!xmodem_send_packet((char*)p, 128)) {
+			aborted = 1;
+			break;
 		}
+		p += 128;
 	}
 
 	xmodem_finish_xfer();
diff --git a/ROM2/memory.x b/ROM2/memory.x
index 6b3abc6..f1127cf 100644
--- a/ROM2/memory.x
+++ b/ROM2/memory.x
@@ -1,10 +1,9 @@
 MEMORY
-{
-  /* we squeeze both page0 and data into the internal 256 bytes of RAM */
+{ /* we squeeze both page0 and data into the internal 256 bytes of RAM */
   page0 (rwx) : ORIGIN = 0x0000, LENGTH = 0x0080
   data  (rw)  : ORIGIN = 0x0080, LENGTH = 0x0080
   text  (rx)  : ORIGIN = 0x8000, LENGTH = 0x8000
-  eeprom(rwx) : ORIGIN = 0x4000, LENGTH = 0x0200
+  eeprom(rwx) : ORIGIN = 0xb600, LENGTH = 0x0020
 }
 
 /* Setup the stack on the top of the data internal ram (not used).  */
diff --git a/ROM2/src2asm.pl b/ROM2/src2asm.pl
new file mode 100644
index 0000000..e382f24
--- /dev/null
+++ b/ROM2/src2asm.pl
@@ -0,0 +1,32 @@
+#!/usr/bin/perl -w
+
+$origin = 0x9800; # must match address of .romsrc in memory.x
+$hole_start = 0xb600;
+$hole_size = 0x0200;
+
+print <<EOT;
+.sect .rodata
+.global _rom_src_data
+.global _rom_src_len
+
+.align 7 ; for a 128-bit boundary
+_rom_src_data:
+EOT
+my $size = 0;
+my $a;
+while (read STDIN,$a,1) {
+	if ($origin+$size == $hole_start) {
+		for($i = 0; $i < $hole_size; $i++) {
+			print "\t.byte 0xff\n";
+		}
+		$size += $hole_size;
+	}
+	printf "\t.byte 0x%04x\n", ord($a);
+	$size++;
+}
+print <<EOT;
+
+	.align 2
+_rom_src_len:
+	.word $size
+EOT
diff --git a/ROM2/src2c.pl b/ROM2/src2c.pl
deleted file mode 100644
index 8da9766..0000000
--- a/ROM2/src2c.pl
+++ /dev/null
@@ -1,17 +0,0 @@
-#!/usr/bin/perl -w
-
-print "#include \"types.h\"\n";
-print "const char _rom_src_data[] = {\n\t";
-my $size = 0;
-my $a;
-while (read STDIN,$a,1) {
-	printf "0x%02x,", ord($a);
-	$size++;
-	if ($size%8 == 0) { print "\n\t"; }
-}
-print <<EOT;
-};
-
-const u16 _rom_src_len = $size;
-
-EOT
-- 
2.20.1