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/* -*- 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>
#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) {
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.");
*/
}
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