LCD_DATA00 to LCD_DATA23 pins for UART7 and UART8

[ramgopalkota]

Sir

We dont want to use LCD in our product. We are using the LCD Data pins as UART7 and UART8 , I2C and SPI.

We have not programmed eFuses and using GPIOs for BOOT_CFG.

As the UART , I2C and SPI pins are BOOT_CFG pins the processor does not boot depending on PIN status.

We dont want to program eFuses as we are buying the Core Module from a 3rd party. (as we may risk warranty etc issues).

We want to use a buffer to tristate the signals at power on and later on use it as device pins..

The buffer planned is txb0108pwr and we want to use POR signal connect to enable of the buffer IC (PIN OE)

Can we use POR signal , so that processor senses the GPIOs on power up ? 

[ramgopalkota]

Dear Sir

As mentioned , we are not using LCD and we are using it for different peripherals.

None of the peripherals are working. (Tried both I2C , GPIO , both CAN )

When we access UART8 (i.e. echo "test" > /dev/ttymxc7) board is hanging.

Below is the map how we are using. Attached is the kernel config (Disabled LCD and SOUND related configs) and DTS file. 

Please let me know what is that we are doing wrong.

LCD_DATA00 -- I2C3_DATA
LCD_DATA01 -- I2C3_CLK
LCD_DATA02 -- I2C4_DATA
LCD_DATA03 -- I2C4_CLK
LCD_DATA04 -- UART8_CTS
LCD_DATA05 -- UART8_RTS
LCD_DATA06 -- UART7_CTS
LCD_DATA07 -- UART7_RTS
LCD_DATA08 -- CAN1_TX
LCD_DATA09 -- CAN1_RX
LCD_DATA10 -- CAN2_TX
LCD_DATA11 -- CAN2_RX
LCD_DATA12 -- GPIO
LCD_DATA13 -- GPIO
LCD_DATA14 -- GPIO
LCD_DATA15 -- GPIO
LCD_DATA16 -- UART7_TX
LCD_DATA17 -- UART7_RX
LCD_DATA18 -- NC
LCD_DATA19 -- NC
LCD_DATA20 -- UART8_TX
LCD_DATA21 -- UART8_RX
LCD_DATA22 -- SPI1_MOSI
LCD_DATA23 -- SPI1_MISO

[igorpadykov]

Hi Ramgopal

yes such solution is possible please look at similar implementation on p.13

attached i.MX6SL EVK schematic.

Best regards
igor
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