How to set up UART2 in J990

Overview

This How-To is meant to be a starting point for people to learn to set up UART2 for IGEPv2 J990 connector as quickly and easily as possible. In this how-to, we use Linaro Headless with Kernel 2.6.35.y. This How-To is focused for revisions RC1/RC3/RC4/RC6 (WIFI/BT versions).

More information about UART.

There are two modes to configure UART2 in J990: via user space (fast mode) or editing kernel source and compile it (slow mode).

Feedback and Contributing

At any point, if you see a mistake you can contribute to this How-To.

Configure IGEP

Fast Mode, set up UART2 until system reboot or halt, we uses user space to configure mux and disabling bluethoot. Default kernel binaries and source have disabled TWL4030 PCM voice interface output pins to high impedance, otherwise this module forces the level of mcbsp3_fsx and mcbsp3_clkx pins. To make sure, go to ~/sound/soc/codecs/twl4030.c file already read:

	0x04, /* REG_VOICE_IF		(0xF)	*/