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Currently, when CCD is opened, there is no way to disable the EC and/or AP UARTs. But if there is some problem with the EC and/or AP, and their UARTs are spamming interrupts, it can make debugging more difficult. If servo detection malfunctions, then CCD may drive the ports and interfere with servo. Add a new ccdblock command to disable the AP UART, EC UART, or any ports shared with servo, until the next cr50 reboot. BUG=b:65639347 BRANCH=cr50 TEST=manual with CR50_DEV=1 image, AP/EC powered on, suzyq connected ccdblock --> (none) ccdstate --> UARTAP+TX UARTEC+TX I2C SPI ccdblock AP on ccdstate --> UARTEC+TX I2C SPI ccdblock EC on ccdstate --> I2C SPI ccdblock -> AP EC ccdblock AP off ccdstate --> UARTAP+TX I2C SPI ccdblock EC off --> (none) ccdstate --> UARTAP+TX UARTEC+TX I2C SPI ccdblock SERVO on ccdstate --> UARTAP UARTEC ccd lock ccdblock AP on --> access denied Change-Id: I3dcc8314fc98a17af57f2fe0d150ecd1a19ccf52 Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/693041 Reviewed-by: Mary Ruthven <mruthven@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly