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= Overview =
<section begin=overview />
This How-To is meant to be a starting point for people to learn use UART for IGEP devices as quickly and easily as possible. In this howHow-toTo, we use [http://labs.isee.biz/index.php/Pre-installed_software_on_IGEP_Processor_Boards IGEP Firmware] and a program that use UART peripherals. This How-to To was tested in: *[[IGEP firmware Yocto|IGEP firmware Yocto]] with and [[Linux_Kernel_2.6.37.y|Kernel 2.6.37.y]]with IGEPv2.
Example program has a debug option using GPIOs to debug via oscilloscope, this method is useful to learn about the Kernel latencies. Debug has set to "write" and "select" functions. [[Peripherals Summary#UART|More information]].
= Preparing IGEP =
IGEP Uart devices have the following names in Kernel [[Linux Kernel 2.6.35.y|2.6.35.y]]:
*UART1: /dev/ttyS0
*UART2: /dev/ttyS1
*UART3: /dev/ttyS2
*UART4: /dev/ttyS3
IGEP Uart devices have the following names in Kernel [[Linux Kernel 2.6.37.y|2.6.37.y]]:
*UART1: /dev/ttyO0
*UART2: /dev/ttyO1
*UART3: /dev/ttyO2
*UART4: /dev/ttyO3
=== Configure UART1 and UART3 in IGEP with RS232 levels on J960 connector ===
;console=ttyO</pre>
==== Edit inittab file ====
Getty program uses /dev/ttyO2 in IGEP Firmware, disable it modifying /devetc/inittab file:
*Comment next line:
<pre> #S:2345:respawn:/sbin/getty 115200 ttyO2</pre>