From 0a07b18626f0735f7c919ae78fdbae41e55fb2eb Mon Sep 17 00:00:00 2001
From: Romain Dolbeau <romain@dolbeau.org>
Date: Sat, 28 Jun 2025 08:12:27 +0200
Subject: [PATCH] ROM patch to support 128 MiB in the 3/160 ROM (tested in TME
 only)

---
 RomPatcher/Sun3_160MaxMemory/Makefile   | 41 +++++++++++++++++++++++++
 RomPatcher/Sun3_160MaxMemory/input.txt  |  2 ++
 RomPatcher/Sun3_160MaxMemory/rompatch.s |  9 ++++++
 3 files changed, 52 insertions(+)
 create mode 100644 RomPatcher/Sun3_160MaxMemory/Makefile
 create mode 100644 RomPatcher/Sun3_160MaxMemory/input.txt
 create mode 100644 RomPatcher/Sun3_160MaxMemory/rompatch.s

diff --git a/RomPatcher/Sun3_160MaxMemory/Makefile b/RomPatcher/Sun3_160MaxMemory/Makefile
new file mode 100644
index 0000000..ea41906
--- /dev/null
+++ b/RomPatcher/Sun3_160MaxMemory/Makefile
@@ -0,0 +1,41 @@
+RETRO68=/home/dolbeau/Retro68/build/toolchain
+AS=${RETRO68}/bin/m68k-apple-macos-as
+CC=${RETRO68}/bin/m68k-apple-macos-gcc
+LD=${RETRO68}/bin/m68k-apple-macos-ld
+STRIP=${RETRO68}/bin/m68k-apple-macos-strip
+OBJCOPY=${RETRO68}/bin/m68k-apple-macos-objcopy
+NM=${RETRO68}/bin/m68k-apple-macos-nm
+
+HOSTCC=gcc
+HOSTCFLAGS=-O2
+
+ARCHFLAGS=-march=68020 -mcpu=68020
+CFLAGS=-O2 -mpcrel
+
+GENLINK=../patcher/genlink
+PATCHER=../patcher/patcher
+
+all: sun3-carrera-rev-3.0.bin
+
+show: rompatch.elf
+	$(NM) $< | sort
+
+sun3-carrera-rev-3.0.bin: ../ rompatch.raw input.txt
+	/bin/cp ../sun3-carrera-rev-3.0.bin sun3-carrera-rev-3.0.bin
+	${PATCHER} -i rompatch.raw -p sun3-carrera-rev-3.0.bin -d input.txt
+
+linker.ld: input.txt rompatch.s
+	${GENLINK} -d $< >| $@
+	echo $(shell for X in `grep .section rompatch.s | awk '{ print $$2 }' `; do grep -q $$X linker.ld || echo " $$X has no entry in linker.ld" && /bin/false; done)
+
+rompatch.o: rompatch.s
+	${AS} ${ARCHFLAGS} $< -o $@ -a > rompatch.l
+
+rompatch.elf: linker.ld rompatch.o ${CSRC:.c=.o} # linker script must be first
+	${LD} -o $@ -T $^
+
+rompatch.raw: rompatch.elf
+	${OBJCOPY} $^ $@ --input-target=elf32-m68k --output-target=binary
+
+clean:
+	rm -f res.inc ${CSRC_ASM} *.o rompatch.srec rompatch.raw rompatch.dir rompatch.l linker.ld rompatch.elf
diff --git a/RomPatcher/Sun3_160MaxMemory/input.txt b/RomPatcher/Sun3_160MaxMemory/input.txt
new file mode 100644
index 0000000..22460bc
--- /dev/null
+++ b/RomPatcher/Sun3_160MaxMemory/input.txt
@@ -0,0 +1,2 @@
+0x0c5a2, 6, replace1
+0x0c60a, 6, replace2
diff --git a/RomPatcher/Sun3_160MaxMemory/rompatch.s b/RomPatcher/Sun3_160MaxMemory/rompatch.s
new file mode 100644
index 0000000..d2e3892
--- /dev/null
+++ b/RomPatcher/Sun3_160MaxMemory/rompatch.s
@@ -0,0 +1,9 @@
+	.section .text.replace1
+replace1:
+	cmp.l #0x08000000,%A5
+	.section .text.finishedreplace1
+	
+	.section .text.replace2
+replace2:
+	move.l #0x01fe0000,%D5
+	.section .text.finishedreplace2