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, 208 insertions, 0 deletions

diff --git a/resources/depthcharge/patch/0007-vboot-Display-callbacks-for-developer-and-recovery-m.patch b/resources/depthcharge/patch/0007-vboot-Display-callbacks-for-developer-and-recovery-m.patch
new file mode 100644
index 0000000..4de5a67
--- /dev/null
+++ b/resources/depthcharge/patch/0007-vboot-Display-callbacks-for-developer-and-recovery-m.patch
@@ -0,0 +1,208 @@
+From dc7421b033667ccbad3429e6ed118c849f3b05ca Mon Sep 17 00:00:00 2001
+From: Paul Kocialkowski <contact@paulk.fr>
+Date: Tue, 11 Aug 2015 11:22:54 +0200
+Subject: [PATCH 7/7] vboot: Display callbacks for developer and recovery mode
+ screens
+
+We don't want to use bitmaps stored in GBB since they recommend the use of non-
+free software (Chrome OS), so this implements a text-based interface instead.
+
+Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
+---
+ src/vboot/callbacks/display.c | 157 ++++++++++++++++++++++++++++++++++++++----
+ 1 file changed, 145 insertions(+), 12 deletions(-)
+
+diff --git a/src/vboot/callbacks/display.c b/src/vboot/callbacks/display.c
+index efa0691..2341621 100644
+--- a/src/vboot/callbacks/display.c
++++ b/src/vboot/callbacks/display.c
+@@ -84,9 +84,16 @@ void print_on_center(const char *msg)
+ 	print_string(msg);
+ }
+ 
+-VbError_t VbExDisplayScreen(uint32_t screen_type)
++VbError_t VbExDisplayScreen(uint32_t screen_type, VbNvContext *vnc)
+ {
+-	const char *msg = NULL;
++	unsigned int rows, cols;
++	uint32_t boot_signed_only = 0;
++	uint32_t boot_usb = 0;
++	const char *fw_id;
++	int fw_index;
++	void *blob = NULL;
++	int size = 0;
++	char *msg;
+ 
+ 	/*
+ 	 * Show the debug messages for development. It is a backup method
+@@ -98,31 +105,157 @@ VbError_t VbExDisplayScreen(uint32_t screen_type)
+ 		video_console_clear();
+ 		break;
+ 	case VB_SCREEN_DEVELOPER_WARNING:
+-		msg = "developer mode warning";
++		video_console_clear();
++		video_console_set_cursor(0, 0);
++
++		if (vnc != NULL) {
++			VbNvGet(vnc, VBNV_DEV_BOOT_SIGNED_ONLY,
++				&boot_signed_only);
++
++			VbNvGet(vnc, VBNV_DEV_BOOT_USB, &boot_usb);
++		}
++
++		print_string(
++			"Welcome to developer mode!\n\n"
++			"Useful key combinations:\n"
++			"- Ctrl + H: Hold developer mode\n"
++			"- Ctrl + D: Continue booting\n");
++
++		if (boot_usb)
++			print_string("- Ctrl + U: Boot from external media\n");
++
++		print_string(
++			"- Ctrl + L: Boot from legacy media\n"
++			"- Ctrl + I: Show device information\n"
++			"- Space: Disable developer mode\n\n"
++			"This screen is shown for 3 seconds (if not held).\n\n");
++
++		if (vnc != NULL) {
++			if (!boot_signed_only)
++				print_string(
++					"Warning: this device will boot "
++					"unsigned kernels!\n");
++
++			if (boot_usb)
++				print_string(
++					"Warning: this device will boot from "
++					"external media!\n");
++
++			if (!boot_signed_only || boot_usb)
++				print_string("\n");
++		}
++
++		find_common_params(&blob, &size);
++
++		if (blob != NULL) {
++			VbSharedDataHeader *vdat = (VbSharedDataHeader *) blob;
++			fw_index = get_active_fw_index(vdat);
++			fw_id = get_fw_id(fw_index);
++
++			if (fw_id == NULL)
++				fw_id = "NOT FOUND";
++
++			print_string("Active firmware id: ");
++			print_string(fw_id);
++
++			switch (fw_index) {
++				case VDAT_RW_A:
++					print_string(" (RW A)\n");
++					break;
++				case VDAT_RW_B:
++					print_string(" (RW A)\n");
++					break;
++				case VDAT_RO:
++					print_string(" (RO)\n");
++					break;
++				default:
++					print_string(" (UNKNOWN)\n");
++					break;
++			}
++		}
+ 		break;
+ 	case VB_SCREEN_DEVELOPER_EGG:
+-		msg = "easter egg";
++		video_console_clear();
++		print_on_center("Free as in Freedom!");
+ 		break;
+ 	case VB_SCREEN_RECOVERY_REMOVE:
+-		msg = "remove inserted devices";
++		video_console_clear();
++		print_on_center(
++			"Please remove any external media before accessing "
++			"recovery screen.");
+ 		break;
+ 	case VB_SCREEN_RECOVERY_INSERT:
+-		msg = "insert recovery image";
+-		break;
+ 	case VB_SCREEN_RECOVERY_NO_GOOD:
+-		msg = "insert image invalid";
++		video_console_clear();
++		print_string(
++			"Welcome to recovery mode!\n\n"
++			"Useful key combinations:\n"
++			"- Ctrl + D: Enable developer mode\n\n");
++
++		if (screen_type == VB_SCREEN_RECOVERY_NO_GOOD)
++			print_on_center(
++				"Invalid recovery media, please instert a "
++				"valid one.");
++		else
++			print_on_center(
++				"Please insert an external recovery media.");
++		break;
++	case VB_SCREEN_RECOVERY_TO_DEV:
++		video_console_clear();
++		video_get_rows_cols(&rows, &cols);
++
++		video_console_set_cursor(0, 0);
++
++		print_string(
++			"Enabling developer mode will allow booting unsigned "
++			"kernels and booting from external media (when enabled "
++			"with crossystem).\n\n"
++			"Developer mode can be disabled via the developer mode "
++			"screen.");
++
++		msg = "Developer mode will be enabled.";
++		video_console_set_cursor((cols - strlen(msg)) / 2, rows / 2);
++		print_string(msg);
++
++		msg = "Press enter to confirm or escape to go back.";
++		video_console_set_cursor((cols - strlen(msg)) / 2,
++					 rows / 2 + 2);
++		print_string(msg);
++		break;
++	case VB_SCREEN_DEVELOPER_TO_NORM:
++		video_console_clear();
++		video_get_rows_cols(&rows, &cols);
++
++		video_console_set_cursor(0, 0);
++
++		print_string(
++			"Disabling developer mode will restrict boot to signed "
++			"kernels stored on internal memory only.\n\n"
++			"Developer mode can be enabled again via the recovery "
++			"mode screen.");
++
++		msg = "Developer mode will be disabled.";
++		video_console_set_cursor((cols - strlen(msg)) / 2, rows / 2);
++		print_string(msg);
++
++		msg = "Press enter to confirm or escape to go back.";
++		video_console_set_cursor((cols - strlen(msg)) / 2,
++					 rows / 2 + 2);
++		print_string(msg);
+ 		break;
+ 	case VB_SCREEN_WAIT:
+-		msg = "wait for ec update";
++		video_console_clear();
++		print_on_center("Waiting for EC update...");
++		break;
++	case VB_SCREEN_TO_NORM_CONFIRMED:
++		video_console_clear();
++		print_on_center("Disabling developer mode.");
+ 		break;
+ 	default:
+ 		printf("Not a valid screen type: %d.\n", screen_type);
+ 		return VBERROR_INVALID_SCREEN_INDEX;
+ 	}
+ 
+-	if (msg)
+-		print_on_center(msg);
+-
+ 	return VBERROR_SUCCESS;
+ }
+ 
+-- 
+1.9.1
+