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Add flag to GBB to allow loading PCI Option ROMs

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As shipped, H2C only loads the option ROM for the built-in video, and that
only when it needs display the BIOS warning screens.

By setting a flag in the GBB, you can allow all option ROMs to be loaded:

Note that we'll never enable this ourselves (and there's a factory test to
ensure that*) because it executes non-verified code. But if a customer wants
to void their warranty and set this flag in the read-only flash so they can
install and use other PCI devices, they should be able to do so.

BUG=chrome-os-partner:6148
TEST=none

The only way to test this is to use a BIOS that was compiled with serial
debugging enabled, so there's nothing for QA to do. If you have such a BIOS,
you can see the difference like so:

  flashrom -r oldbios.bin
  gbb_utility -s --flags=2 oldbios.bin newbios.bin
  flashrom -w newbios.bin
  <reboot>

When bit 1 of the GBB flags is 0, you'll see these lines in the serial
output:

  LoadOpRomImage-->GetSystemConfigurationTable Status = Success
  LoadOpRomImage-->GetH2cBootMode Status = Success

When bit 1 of the GBB flags is 1, you'll see these lines in the serial
output:

  LoadOpRomImage-->GetSystemConfigurationTable Status = Success
  LoadOpRomImage-->GetH2cBootMode Status = Success
  LoadOpRomImage-->PCI OpRom on 1.0.0 is allowed!!!

This happens in any boot mode (normal, developer, recovery).

--
*The factory test for GBB zero flags is gft_clear_gbb_flags.sh, in
 src/platform/factory_test_tools

Change-Id: I31a10cc9d562b4b83669ca8a114b60e87ae28b0a
Reviewed-on: https://gerrit.chromium.org/gerrit/11505
Tested-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-by: Gaurav Shah <gauravsh@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
This commit is contained in:
Bill Richardson
2011-11-10 13:31:39 -08:00
parent fa9d7782e8
commit c8e4ff7c15
4 changed files with 24 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
firmware/include/vboot_api.h
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@@ -184,6 +184,8 @@ typedef struct VbCommonParams {
#define VB_INIT_OUT_ENABLE_USB_STORAGE 0x00000008
/* If this is a S3 resume, do a debug reset boot instead */
#define VB_INIT_OUT_S3_DEBUG_BOOT 0x00000010
/* BIOS should load any PCI option ROMs it finds, not just internal video */
#define VB_INIT_OUT_ENABLE_OPROM 0x00000020
/* Data only used by VbInit() */