coreboot: introduce boot_device

The boot_device is a region_device that represents the
device from which coreboot retrieves and boots its stages.
The existing cbfs implementations use the boot_device as
the intermediary for accessing the CBFS region. Also,
there's currently only support for a read-only view of
the boot_device. i.e. one cannot write to the boot_device
using this view. However, a writable boot_device could
be added in the future.

Change-Id: Ic0da796ab161b8025c90631be3423ba6473ad31c
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/10216
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/src/cpu/allwinner/a10/bootblock_media.c b/src/cpu/allwinner/a10/bootblock_media.c
index a5863b6faf..a585bcaaa8 100644
--- a/src/cpu/allwinner/a10/bootblock_media.c
+++ b/src/cpu/allwinner/a10/bootblock_media.c
@@ -4,11 +4,17 @@
  * Copyright (C) 2013  Alexandru Gagniuc <mr.nuke.me@gmail.com>
  * Subject to the GNU GPL v2, or (at your option) any later version.
  */
+#include <boot_device.h>
 #include <cbfs.h>
 #include <console/console.h>
 
+const struct region_device *boot_device_ro(void)
+{
+	return NULL;
+}
+
 int init_default_cbfs_media(struct cbfs_media *media)
 {
 	printk(BIOS_ERR, "Oh my! I don't know how to access CBFS yet.");
-	return 0;
+	return -1;
 }