Function ec_update_image

src/security/vboot/ec_sync.c:322–371

* The logic for updating an EC firmware image. */

 * The logic for updating an EC firmware image.
 */
static vb2_error_t ec_update_image(enum vb2_firmware_selection select)
{
	uint32_t region_offset, region_size;
	enum ec_flash_region region;
	vb2_error_t rv;
	void *image;
	size_t image_size;

	/* Un-protect the flash region */
	rv = ec_protect_flash(0);
	if (rv != VB2_SUCCESS)
		return rv;

	/* Convert vboot region into an EC region */
	region = vboot_to_ec_region(select);

	/* Get information about the flash region */
	if (google_chromeec_flash_region_info(region, &region_offset,
					      &region_size))
		return VB2_ERROR_UNKNOWN;

	/* Map the CBFS file */
	image = cbfs_map(EC_IMAGE_FILENAME(select), &image_size);
	if (!image)
		return VB2_ERROR_UNKNOWN;

	rv = VB2_ERROR_UNKNOWN;

	/* Bail if the image is too large */
	if (image_size > region_size)
		goto unmap;

	/* Erase the region */
	if (google_chromeec_flash_erase(region_offset, region_size))
		goto unmap;

	/* Write the image into the region */
	if (ec_flash_write(image, region_offset, image_size))
		goto unmap;

	/* Verify the image */
	if (google_chromeec_efs_verify(region))
		goto unmap;

	rv = VB2_SUCCESS;

unmap:
	cbfs_unmap(image);
	return rv;
}

static vb2_error_t ec_get_expected_hash(enum vb2_firmware_selection select,
					const uint8_t **hash,