Add clear screen in BIOS

danodus · Jun 5, 2024 · bb99553 · bb99553
1 parent a274a98
commit bb99553
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Showing 4 changed files with 30 additions and 3 deletions.
diff --git a/soc/rtl/mmm/Makefile b/soc/rtl/mmm/Makefile
@@ -62,7 +62,7 @@ all: top.bin
 clean:
 	rm -f *.hex *.asc *.json *.bin *.log
 
-top.json: $(SRC)
+top.json: $(SRC) prom.mem
 	make -C ../../src/bios
 	$(YOSYS) -ql top.log -p 'verilog_defines $(DEFINES) ; read_verilog -sv $(SRC); synth_ecp5 -top $(TOP_MODULE) -json top.json -abc9'
 

diff --git a/soc/rtl/ulx3s/Makefile b/soc/rtl/ulx3s/Makefile
@@ -61,7 +61,7 @@ all: top.bin
 clean:
 	rm -f *.hex *.asc *.json *.bin *.log
 
-top.json: $(SRC)
+top.json: $(SRC) prom.mem
 	make -C ../../src/bios
 	$(YOSYS) -ql top.log -p 'verilog_defines $(DEFINES) ; read_verilog -sv $(SRC); synth_ecp5 -top $(TOP_MODULE) -json top.json -abc9'
 

diff --git a/soc/src/bios/program.c b/soc/src/bios/program.c
@@ -3,10 +3,12 @@
 #define RAM_START   0x00000000
 
 #define BASE_IO     0xE0000000
+#define BASE_VIDEO  0x1000000
 
 #define LED         (BASE_IO + 4)
 #define UART_DATA   (BASE_IO + 8)
 #define UART_STATUS (BASE_IO + 12)
+#define CONFIG      (BASE_IO + 36)
 
 #define MEM_WRITE(_addr_, _value_) (*((volatile unsigned int *)(_addr_)) = _value_)
 #define MEM_READ(_addr_) *((volatile unsigned int *)(_addr_))
@@ -90,8 +92,33 @@ int receive_program()
     return 1;
 }
 
+void flush_cache(void)
+{
+    // Flush cache
+    MEM_WRITE(CONFIG, 0x1);
+}
+
+void clear(int color)
+{
+    unsigned int res = MEM_READ(CONFIG);
+    unsigned hres = res >> 16;
+    unsigned vres = res & 0xffff;
+
+    unsigned int *fb = (unsigned int *)BASE_VIDEO;
+    unsigned int c = color << 16 | color;
+    for (unsigned int y = 0; y < vres; y++)
+        for (unsigned int x = 0; x < hres / 2; x++) {
+            *fb = c;
+            fb++;
+        }
+
+    flush_cache();
+}
+
 void main(void)
 {
+    clear(0xF333);
+
     if (receive_program())
         start_prog();
 }
diff --git a/soc/src/bios/program.ld b/soc/src/bios/program.ld
@@ -8,7 +8,7 @@ SECTIONS {
 		. = 0x000000;
 		*(.init);
 		*(.text);
-		*(*);
+		*(.sbss);
 		. = ALIGN(4);
 		end = .;
 	} >ram