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Add CTRL-L in dev screen to support a "legacy boot option"

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This option is disabled per default and can be enabled with
crossystem dev_boot_legacy=1
or by setting the GBB flag
GBB_FLAG_FORCE_DEV_BOOT_LEGACY      0x00000080

BUG=chrome-os-partner:6108
TEST=crossystem dev_boot_legacy=1
     boot to dev mode screen, press CTRL-L, see SeaBIOS start
     (other CLs needed)
BRANCH=link
Signed-off-by: Stefan Reinauer <reinauer@chromium.org>

Change-Id: I593d2be7cff5ca07b8d08012c4514a172bd75a38
Reviewed-on: https://gerrit.chromium.org/gerrit/31265
Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
Tested-by: Stefan Reinauer <reinauer@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Ready: Stefan Reinauer <reinauer@chromium.org>
This commit is contained in:
Stefan Reinauer
2012-08-23 15:06:45 -07:00
committed by Gerrit
parent 40bc7b7802
commit a2326ee152
12 changed files with 56 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
firmware/lib/vboot_api_kernel.c
View File

@@ -156,16 +156,19 @@ VbError_t VbBootNormal(VbCommonParams* cparams, LoadKernelParams* p) {
VbError_t VbBootDeveloper(VbCommonParams* cparams, LoadKernelParams* p) {
GoogleBinaryBlockHeader* gbb = (GoogleBinaryBlockHeader*)cparams->gbb_data;
VbSharedDataHeader* shared = (VbSharedDataHeader*)cparams->shared_data_blob;
uint32_t allow_usb = 0;
uint32_t allow_usb = 0, allow_legacy = 0;
VbAudioContext* audio = 0;
VBDEBUG(("Entering %s()\n", __func__));
/* Check if USB booting is allowed */
VbNvGet(&vnc, VBNV_DEV_BOOT_USB, &allow_usb);
VbNvGet(&vnc, VBNV_DEV_BOOT_LEGACY, &allow_legacy);
/* Handle GBB flag override */
if (gbb->flags & GBB_FLAG_FORCE_DEV_BOOT_USB)
allow_usb = 1;
if (gbb->flags & GBB_FLAG_FORCE_DEV_BOOT_LEGACY)
allow_legacy = 1;
/* Show the dev mode warning screen */
VbDisplayScreen(cparams, VB_SCREEN_DEVELOPER_WARNING, 0, &vnc);
@@ -227,6 +230,20 @@ VbError_t VbBootDeveloper(VbCommonParams* cparams, LoadKernelParams* p) {
VBDEBUG(("VbBootDeveloper() - user pressed Ctrl+D; skip delay\n"));
goto fallout;
break;
case 0x0c:
VBDEBUG(("VbBootDeveloper() - user pressed Ctrl+L; Try legacy boot\n"));
/* If VbExLegacy() succeeds, it will never return.
* If it returns, beep.
*/
if (allow_legacy)
VbExLegacy();
else
VBDEBUG(("VbBootDeveloper() - Legacy boot is disabled\n"));
VbExBeep(120, 400);
VbExSleepMs(120);
VbExBeep(120, 400);
break;
/* The Ctrl-Enter is special for Lumpy test purpose. */
case VB_KEY_CTRL_ENTER:
case 0x15: