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92cda018f8
Previously only 1 pin DI0A1 was being read to distinguish between SPI/I2C configurations. This change adds code to support reading 4 strapping pins DIOA9|DIOA1 and DIOA12|DIOA6 and enabling the internal pullup/pulldown reistors to differentiate between weak and strong external pull up/dn restistors. An 8 bit strap config id is produced and then a config table is searched to match the config id with known configuraitons. The board properties to be used are read from the config table. BRANCH=none BUG=chrome-os-partner:59833 TEST=manual Modified the Cr50 dev board with 1M and 5k pullup/pulldown resistors and connected them to 4 GPIOs (defined as strapping pins). Tested the 12 possible external pullup/pulldown configurations and verified that the correct 5 bit value was produced for each configuration. Tested with both Reef and Gru. On Reef the strap config = 0x12 and on Gru it reads 0x2 as expected. Verfifed TPM was functional on both systems. Change-Id: I18c625a2b6b904bf4bcdaf2665ed9c3cbdafeb54 Signed-off-by: Scott <scollyer@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/421580 Commit-Ready: Scott Collyer <scollyer@chromium.org> Tested-by: Scott Collyer <scollyer@chromium.org> Tested-by: Vadim Bendebury <vbendeb@chromium.org> Reviewed-by: Vadim Bendebury <vbendeb@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