From 74fe5e24beb14b00ce3d69e5a3010c520d4bf8e5 Mon Sep 17 00:00:00 2001
From: Takamichi Horikawa <myon@myon98.net>
Date: Sat, 4 Dec 2021 13:41:35 +0900
Subject: Initial: vram write test

---
 01-ctest/start.S | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 01-ctest/start.S

(limited to '01-ctest/start.S')

diff --git a/01-ctest/start.S b/01-ctest/start.S
new file mode 100644
index 0000000..933bf48
--- /dev/null
+++ b/01-ctest/start.S
@@ -0,0 +1,25 @@
+#define VRAMADDR 0x14800000
+#define DISPH 480
+#define DISPW 800
+
+#define DRAM_START 0xa0000000
+#define DRAM_END   0xa4000000
+
+.globl start
+.arm
+start:
+  @setup stack
+  ldr sp, =(DRAM_END)
+  @initialize bss
+  ldr r0, =_edata
+  ldr r1, =_end
+  mov r2, #0
+.Lbssloop:
+  cmp r0, r1
+  bhs .Lbssloopend
+  stmia r0!, {r2}
+  b .Lbssloop
+.Lbssloopend:
+  blx cstart
+.Lhalt:
+  b .Lhalt
-- 
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