From 0aefffacb5cb08202f7ba53b6e3b9a7303b1d66e Mon Sep 17 00:00:00 2001
From: Miquel Sabaté Solà <mikisabate@gmail.com>
Date: Thu, 23 Jan 2025 13:57:45 +0100
Subject: Use custom configurations everywhere
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Moreover, I have introduced a linker configuration for MMC1 as well, so
to properly implement the `basics/persist.s` example.

Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
---
 config/mmc1.cfg  | 26 ++++++++++++++++++++++++++
 config/nrom.cfg  | 24 ++++++++++++++++++++++++
 config/unrom.cfg | 24 +++++++++++-------------
 3 files changed, 61 insertions(+), 13 deletions(-)
 create mode 100644 config/mmc1.cfg
 create mode 100644 config/nrom.cfg

(limited to 'config')

diff --git a/config/mmc1.cfg b/config/mmc1.cfg
new file mode 100644
index 0000000..5544c1f
--- /dev/null
+++ b/config/mmc1.cfg
@@ -0,0 +1,26 @@
+MEMORY {
+    # iNES header.
+    HEADER: start = $0, size = $10, fill = yes;
+
+    # Banked PRG ROM.
+    PRG0: start = $8000, size = $4000, fill = yes, fillval = $f8, define = yes;
+    PRG1: start = $C000, size = $3FFA, fill = yes, fillval = $f9, define = yes;
+
+    # Hardware Vectors.
+    ROMV: start = $FFFA, size = $0006, fill = yes;
+
+    # Banked CHR banks.
+    ROM2_0: start = $0000, size = $2000, fill = yes, fillval = $11;
+    ROM2_1: start = $2000, size = $2000, fill = yes, fillval = $22;
+}
+
+SEGMENTS {
+    HEADER:  load = HEADER, type = ro;
+
+    BANK0:   load = PRG0, type = ro;
+    BANK1:    load = PRG1, type = ro;
+    VECTORS: load = ROMV, type = ro;
+
+    CHR0:    load = ROM2_0, type = ro;
+    CHR1:    load = ROM2_1, type = ro;
+}
diff --git a/config/nrom.cfg b/config/nrom.cfg
new file mode 100644
index 0000000..41a1f2a
--- /dev/null
+++ b/config/nrom.cfg
@@ -0,0 +1,24 @@
+##
+# Same as the default NROM configuration provided by cc65, but with C stuff
+# stripped away (e.g. namely, there are no more segments like 'STARTUP').
+
+MEMORY {
+    # iNES header
+    HEADER: file = %O, start = $0000, size = $0010, fill = yes;
+
+    # Fixed ROM.
+    ROM0: file = %O, start = $8000, size = $7FFA, fill = yes, define = yes;
+
+    # Hardware Vectors.
+    ROMV: file = %O, start = $FFFA, size = $0006, fill = yes;
+
+    # 1 8k CHR Bank
+    ROM2: file = %O, start = $0000, size = $2000, fill = yes;
+}
+
+SEGMENTS {
+    HEADER:   load = HEADER, type = ro;
+    CODE:     load = ROM0,   type = ro, define = yes;
+    VECTORS:  load = ROMV,   type = rw;
+    CHARS:    load = ROM2,   type = rw;
+}
diff --git a/config/unrom.cfg b/config/unrom.cfg
index 5b18707..fccdb88 100644
--- a/config/unrom.cfg
+++ b/config/unrom.cfg
@@ -15,7 +15,7 @@ MEMORY {
     HEADER: start = $0, size = $10, fill = yes;
 
     # Program RAM. Available if a battery-backed RAM was requested.
-    WRAM: start = $6000, size = $2000, define = yes;
+    WRAM: file = "" start = $6000, size = $2000, define = yes;
 
     # Swappable ROM addresses. Note the filled values. This is done so it's also
     # clear by inspecting the memory which bank we are on. This can come in
@@ -29,7 +29,8 @@ MEMORY {
     PRG6: start = $8000, size = $4000, fill = yes, fillval = $fe, define = yes;
 
     # Fixed ROM address.
-    PRG: start = $C000, size = $4000, fill = yes, fillval = $ff, define = yes;
+    PRG: start = $C000, size = $3FFA, fill = yes, fillval = $ff, define = yes;
+    ROMV: start = $FFFA, size = $0006, fill = yes;
 }
 
 SEGMENTS {
@@ -40,19 +41,16 @@ SEGMENTS {
     # code and basic stuff that you don't want ever to be gone here. This will
     # include stuff like the reset code, bank switching utilities, etc.
     FIXED: load = PRG, type = ro, define = yes;
+    VECTORS: load = ROMV, type = ro, define = yes;
 
     ##
     # Swappable banks.
 
-    BANK0: load = PRG0, type = ro, define = yes;
-    BANK1: load = PRG1, type = ro, define = yes;
-    BANK2: load = PRG2, type = ro, define = yes;
-    BANK3: load = PRG3, type = ro, define = yes;
-    BANK4: load = PRG4, type = ro, define = yes;
-    BANK5: load = PRG5, type = ro, define = yes;
-    BANK6: load = PRG6, type = ro, define = yes;
-
-    # Last but not least, the vectors must be the last thing and they are
-    # expecting a very special place on the fixed bank.
-    VECTORS: load = PRG, start = $fffa, type = ro;
+    BANK0: load = PRG0, type = ro;
+    BANK1: load = PRG1, type = ro;
+    BANK2: load = PRG2, type = ro;
+    BANK3: load = PRG3, type = ro;
+    BANK4: load = PRG4, type = ro;
+    BANK5: load = PRG5, type = ro;
+    BANK6: load = PRG6, type = ro;
 }
-- 
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