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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Verified boot module for Chrome EC */
#include "gpio.h"
#include "keyboard_scan.h"
#include "system.h"
#include "uart.h"
#include "util.h"
#include "vboot.h"
/* Jumps to one of the RW images if necessary. */
static void jump_to_other_image(void)
{
/* Only jump to another image if we're currently in RO */
if (system_get_image_copy() != SYSTEM_IMAGE_RO)
return;
#ifdef CONFIG_TASK_KEYSCAN
/* Don't jump if recovery requested */
if (keyboard_scan_recovery_pressed()) {
uart_puts("Vboot staying in RO because key pressed.\n");
return;
}
#endif
/* Don't jump if we're in RO becuase we jumped there (this keeps us
* from jumping to RO only to jump right back). */
if (system_jumped_to_this_image())
return;
#if !defined(BOARD_daisy) && !defined(BOARD_discovery) && !defined(BOARD_adv)
/* TODO: (crosbug.com/p/8572) Daisy and discovery don't define a GPIO
* for the recovery signal from servo, so can't check it. */
if (gpio_get_level(GPIO_RECOVERYn) == 0) {
uart_puts("Vboot staying in RO due to recovery signal.\n");
return;
}
#endif
#ifdef BOARD_link
/* TODO: (crosbug.com/p/8561) once daisy can warm-boot to another
* image, enable this there too. */
/* TODO: real verified boot (including recovery reason); for now, just
* jump to image A. */
system_run_image_copy(SYSTEM_IMAGE_RW_A);
#endif
}
/*****************************************************************************/
/* Initialization */
int vboot_pre_init(void)
{
/* FIXME(wfrichar): crosbug.com/p/7453: should protect flash */
return EC_SUCCESS;
}
int vboot_init(void)
{
/* FIXME(wfrichar): placeholder for full verified boot implementation.
* TBD exactly how, but we may want to continue in RO firmware, jump
* directly to one of the RW firmwares, etc. */
jump_to_other_image();
return EC_SUCCESS;
}
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