Review pin function alternatives with experts

[andrewdavidmackenzie]

We need to resolve what is the correct definition for the following pins (board pin numbers).

See the pin_descriptions.rs
source file for details in comments.

• Pin 7 (BCM 4) --> GPIO4, 2C3_SDA?, GPCLK0?, SMI SA1, DPI D0, AVEOUT_VID0, AVEIN_VID0, JTAG_TDI
• Pin 13 (BCM 27) --> GPIO27, PWM1?, SDO DAT3?, TE1, DPI D23, SD1 DAT3, JTA TMS
• Pin 15 (BCM 22) --> GPIO22, I2C6_SDA?, SD0 CLK?, SMI SD14, DPI D18, SD1 CLK, JTA TRST
• Pin 16 (BCM 23) --> GPIO23, I2C6_SCL?, SD0 CMD?, SMI SD15, DPI D19, SD1 CMD, JTA RTCK
• Pin 18 (BCM 24) --> GPIO24, PWM0?, SD0 DAT0?, SMI SD16, DPI D20, SD1 DAT0, JTA TDO
• Pin 19 (BCM 10) --> GPIO10, SPI0_MOSI?, PWM1?, SMI SD2, DPI D6, AVEOUT VID6, AVEIN VID6
• Pin 21 (BCM 9) --> GPIO9, I2C4_SCL?, SPI0_MISO?, SMI SD1, DPI D5, AVEOUT VID5, AVEIN VID5
• Pin 24 (BCM 8) --> GPIO8, SPI0_CE0_N?, I2C4_SDA?, SMI SD0, DPI D4, AVEOUT VID4, AVEIN VID4
• Pin 27 --> I2C_EEPROM_ID_SD?, I2C0 SDA?, SMI SA5, DPI CLK, AVEOUT VCLK, AVEIN VCLK
• Pin 28 --> I2C_EEPROM_ID_SC?, I2C0 SDL?, SMI SA4, DPI DEN, AVEOUT DSYNC, AVEIN DSYNC
• Pin 29 (BCM 5) --> GPIO5, I2C3_SCL?, GPCLK1?, SMI SA0, DPI D1, AVEOUT VID1, AVEIN VID1, JTA TDO
• Pin 32 (BCM 12) --> GPIO12, I2C5_SDA?, PWM0?, SMI SD4, DPI D8, AVEOUT VID8, AVEIN VID8, JTA TMS
• Pin 33 (BCM 13) --> GPIO13, I2C5_SCL?, PWM1?, SMI SD5, DPI D9, AVEOUT VID9, AVEIN VID9, JTA TCK

[andrewdavidmackenzie]

This can wait until we are ready to add features beyond simple GPIO Input/Output