From b1d67364b4b4832b8efed112f7b0ead1a0b3cd3b Mon Sep 17 00:00:00 2001
From: Kimplul <kimi.h.kuparinen@gmail.com>
Date: Sun, 22 Sep 2024 22:45:18 +0300
Subject: start experimenting with processor grids

---
 tests/simple_uart/hello.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 tests/simple_uart/hello.c

(limited to 'tests/simple_uart/hello.c')

diff --git a/tests/simple_uart/hello.c b/tests/simple_uart/hello.c
new file mode 100644
index 0000000..30719e0
--- /dev/null
+++ b/tests/simple_uart/hello.c
@@ -0,0 +1,18 @@
+/* compile with
+ *	riscv64-unknown-elf-gcc -ffreestanding -nostdlib -Wl,-Ttext=0 -march=rv64i -mabi=lp64 -O2 hello.c -o simple_hello
+ *	xxd --include simple_hello
+ */
+void _start()
+{
+	/* relies on hard-coded system, good enough for this simple test */
+	volatile char *uart = (char *)4096;
+	*uart = 'H';
+	*uart = 'e';
+	*uart = 'l';
+	*uart = 'l';
+	*uart = 'o';
+	*uart = '!';
+	*uart = '\n';
+
+	asm ("ebreak\n");
+}
-- 
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