BUG=chromium-os:17433
TEST=make && make runtests. Additional manual tests:
0. Insert a valid dev-signed USB key.
1. Boot with dev switch off.
`crossystem dev_boot_usb` should print 0.
2. Flip dev switch on.
`crossystem dev_boot_usb` should print 0.
Ctrl+U at dev screen should beep, but not boot USB.
3. Type `crossystem dev_boot_usb=1`. Should succeed.
`crossystem dev_boot_usb` should print 1.
4. Reboot system.
At the dev mode warning, press Ctrl+U
System should boot from USB key
`crossystem dev_boot_usb` should print 0.
5. Flip dev switch off.
`crossystem dev_boot_usb` should print 0.
6. Flip dev switch on.
`crossystem dev_boot_usb` should print 0.
Note that this does not apply to Cr-48, Alex, or ZGB.
Change-Id: Idf85fdd642f38f531c89e5fa5b1679e84936d4da
Reviewed-on: http://gerrit.chromium.org/gerrit/3875
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-by: Stefan Reinauer <reinauer@google.com>
Tested-by: Randall Spangler <rspangler@chromium.org>
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