1 files changed, 104 insertions, 0 deletions
diff --git a/firmware/usrp2/usrp2p/bootloader_utils.c b/firmware/usrp2/usrp2p/bootloader_utils.c
new file mode 100644
index 000000000..1efa643b6
--- /dev/null
+++ b/firmware/usrp2/usrp2p/bootloader_utils.c
@@ -0,0 +1,104 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2010 Ettus Research LLC
+ *
+ */
+
+//contains routines for loading programs from Flash. depends on Flash libraries.
+//also contains routines for reading / writing EEPROM flags for the bootloader
+#include <stdbool.h>
+#include <string.h>
+#include <bootloader_utils.h>
+#include <spi_flash.h>
+#include <i2c.h>
+#include <memory_map.h>
+#include <nonstdio.h>
+#include <xilinx_s3_icap.h>
+#include <mdelay.h>
+#include "spi.h"
+
+#define BUTTON_PUSHED ((router_status->irqs & PIC_BUTTON) ? 0 : 1)
+
+int is_valid_fpga_image(uint32_t addr) {
+//	printf("is_valid_fpga_image(): starting with addr=%x...\n", addr);
+	uint8_t imgbuf[64];
+	spi_flash_read(addr, 64, imgbuf);
+	//we're just looking for leading 0xFF padding, followed by the sync bytes 0xAA 0x99
+	for(size_t i = 0; i<63; i++) {
+		if(imgbuf[i] == 0xFF) continue;
+		if(imgbuf[i] == 0xAA && imgbuf[i+1] == 0x99) {
+			//printf("is_valid_fpga_image(): found valid FPGA image\n");
+			return 1;
+		}
+	}
+	
+	return 0;
+}
+
+int is_valid_fw_image(uint32_t addr) {
+	static const uint8_t fwheader[] = {0x0b, 0x0b, 0x0b, 0x0b}; //just lookin for a jump to anywhere located at the reset vector
+	//printf("is_valid_fw_image(): starting with addr=%x...\n", addr);
+	uint8_t buf[12];
+	spi_flash_read(addr, 4, buf);
+	//printf("is_valid_fw_image(): read ");
+	//for(int i = 0; i < 5; i++) printf("%x ", buf[i]);
+	//printf("\n");
+	return memcmp(buf, fwheader, 4) == 0;
+}
+
+void start_program(void)
+{
+	//ignoring the addr now
+	//all this does is tap that register
+	*((volatile uint32_t *) SR_ADDR_BLDRDONE) = 1;
+}
+
+void do_the_bootload_thing(void) {
+	spif_init(); //initialize SPI flash clock
+	
+    bool production_image = find_safe_booted_flag();
+	set_safe_booted_flag(0); //haven't booted yet
+	
+	if(BUTTON_PUSHED) { //see memory_map.h
+		puts("Starting USRP2+ in safe mode. Loading safe firmware.");
+        return;
+	}
+	
+	if(!production_image) {
+		puts("Checking for valid production FPGA image...");
+		if(is_valid_fpga_image(PROD_FPGA_IMAGE_LOCATION_ADDR)) {
+			puts("Valid production FPGA image found. Attempting to boot.");
+			set_safe_booted_flag(1);
+			mdelay(300); //so serial output can finish
+			icap_reload_fpga(PROD_FPGA_IMAGE_LOCATION_ADDR);
+		}
+		puts("No valid production FPGA image found.\nFalling through to built-in firmware.");
+		return;
+	}
+	if(is_valid_fw_image(PROD_FW_IMAGE_LOCATION_ADDR)) {
+		puts("Valid production firmware found. Loading...");
+		spi_flash_read(PROD_FW_IMAGE_LOCATION_ADDR, FW_IMAGE_SIZE_BYTES, (void *)RAM_BASE);
+		puts("Finished loading. Starting image.");
+		mdelay(300);
+		start_program();
+		puts("ERROR: Return from main program! This should never happen!");
+		//if this happens, though, the safest thing to do is reboot the whole FPGA and start over.
+		mdelay(300);
+		icap_reload_fpga(SAFE_FPGA_IMAGE_LOCATION_ADDR);
+		return;
+	}
+	puts("No valid production firmware found. Falling through to built-in firmware.");
+	/*
+	if(is_valid_fw_image(SAFE_FW_IMAGE_LOCATION_ADDR)) {
+		spi_flash_read(SAFE_FW_IMAGE_LOCATION_ADDR, FW_IMAGE_SIZE_BYTES, (void *)RAM_BASE);
+		puts("Finished loading. Starting image.");
+		mdelay(300);
+		start_program();
+		puts("ERROR: return from main program! This should never happen!");
+		mdelay(300);
+		icap_reload_fpga(SAFE_FPGA_IMAGE_LOCATION_ADDR);
+		return;
+	}
+    puts("ERROR: no safe firmware image available. Falling through to built-in firmware.");
+    */
+}