Chromebook C201 (codename veyron_speedy) support

This introduces Libreboot support for the Asus Chromebook C201 (codename
veyron_speedy). At this point, this produces a standalone Libreboot image that
can be flashed to the RO Coreboot partition of the SPI flash, as well as the
Libreboot version that can be flash to the RO Firmware ID partition.

Libreboot on the Chromebook C201 uses the depthcharge bootloader, modified to
display text messages instead of ChromeOS bitmaps (that encourage the use of
ChromeOS).

For convenience, an installation script, chromebook-flash-replace, is provided
along with a description of the flash layout, to ease the replacement of the
Coreboot and RO Firmware ID partitions on the full SPI flash image.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>

1 files changed, 132 insertions, 0 deletions

diff --git a/resources/depthcharge/patch/0004-Adaptation-for-a-read-only-boot-path-when-no-vboot-h.patch b/resources/depthcharge/patch/0004-Adaptation-for-a-read-only-boot-path-when-no-vboot-h.patch
new file mode 100644
index 0000000..890791b
--- /dev/null
+++ b/resources/depthcharge/patch/0004-Adaptation-for-a-read-only-boot-path-when-no-vboot-h.patch
@@ -0,0 +1,132 @@
+From 5ad9900434045ea97c536c98cb514bdb43114c12 Mon Sep 17 00:00:00 2001
+From: Paul Kocialkowski <contact@paulk.fr>
+Date: Sun, 9 Aug 2015 12:09:35 +0200
+Subject: [PATCH 4/7] Adaptation for a read-only boot path when no vboot
+ handoff data is found
+
+When no vboot handoff data is found, this makes the unified depthcharge build
+attempt to follow the read-only boot path.
+
+vboot_select_firmware is called to grab the kernel key from the firmware header,
+but it won't actually jump to a RW version of depthcharge.
+
+Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
+---
+ src/image/Makefile.inc                |  1 +
+ src/image/startrw_stub.c              | 34 ++++++++++++++++++++++++++++++++++
+ src/vboot/main.c                      | 17 ++++++++++++++++-
+ src/vboot/util/commonparams-unified.c | 11 +++++++++--
+ 4 files changed, 60 insertions(+), 3 deletions(-)
+ create mode 100644 src/image/startrw_stub.c
+
+diff --git a/src/image/Makefile.inc b/src/image/Makefile.inc
+index 95aeda1..4b74c11 100644
+--- a/src/image/Makefile.inc
++++ b/src/image/Makefile.inc
+@@ -18,6 +18,7 @@
+ depthcharge-y += fmap.c
+ depthcharge-y += index.c
+ readonly-y += startrw.c
++unified-y += startrw_stub.c
+ 
+ trampoline-y += load_elf.c
+ 
+diff --git a/src/image/startrw_stub.c b/src/image/startrw_stub.c
+new file mode 100644
+index 0000000..8e40302
+--- /dev/null
++++ b/src/image/startrw_stub.c
+@@ -0,0 +1,34 @@
++/*
++ * Copyright 2012 Google Inc.
++ *
++ * See file CREDITS for list of people who contributed to this
++ * project.
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License as
++ * published by the Free Software Foundation; either version 2 of
++ * the License, or (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but without any warranty; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
++ * GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
++ * MA 02111-1307 USA
++ */
++
++#include <libpayload.h>
++#include <lzma.h>
++
++#include "base/elf.h"
++#include "image/enter_trampoline.h"
++#include "image/startrw.h"
++#include "image/symbols.h"
++
++int start_rw_firmware(const void *compressed_image, uint32_t size)
++{
++	return 0;
++}
+diff --git a/src/vboot/main.c b/src/vboot/main.c
+index 7dc05f5..97a218d 100644
+--- a/src/vboot/main.c
++++ b/src/vboot/main.c
+@@ -82,6 +82,20 @@ static int vboot_init_handoff()
+ 	return vboot_do_init_out_flags(vboot_handoff->init_params.out_flags);
+ }
+ 
++static int vboot_init_ro()
++{
++	// Set up the common param structure, clearing shared data.
++	if (common_params_init(1))
++		return 1;
++
++	// Initialize vboot.
++	if (vboot_init())
++		return 1;
++
++	// Select firmware.
++	return vboot_select_firmware();
++}
++
+ int main(void)
+ {
+ 	// Let the world know we're alive.
+@@ -108,7 +122,8 @@ int main(void)
+ 
+ 	// Set up the common param structure, not clearing shared data.
+ 	if (vboot_init_handoff())
+-		halt();
++		if (vboot_init_ro())
++			halt();
+ 
+ 	/* Fastboot is only entered in recovery path */
+ 	if (vboot_in_recovery())
+diff --git a/src/vboot/util/commonparams-unified.c b/src/vboot/util/commonparams-unified.c
+index 10fcb93..575dcfd 100644
+--- a/src/vboot/util/commonparams-unified.c
++++ b/src/vboot/util/commonparams-unified.c
+@@ -28,7 +28,14 @@
+ int find_common_params(void **blob, int *size)
+ {
+ 	struct vboot_handoff *vboot_handoff = lib_sysinfo.vboot_handoff;
+-	*blob = &vboot_handoff->shared_data[0];
+-	*size = ARRAY_SIZE(vboot_handoff->shared_data);
++
++	if (vboot_handoff != NULL) {
++		*blob = &vboot_handoff->shared_data[0];
++		*size = ARRAY_SIZE(vboot_handoff->shared_data);
++	} else {
++		*blob = shared_data_blob;
++		*size = sizeof(shared_data_blob);
++	}
++
+ 	return 0;
+ }
+-- 
+1.9.1
+