I am doing development on AT91SAM9263.
I can work well with two serial RS232 ports ttyS0 for debug and ttyS1.
Now I wish to work with another two more RS232 ports .i.e. ttyS2 and ttyS3.

I built hardware accordingly by using TXD1, RXD1 and TXD2,RXD2 pins from
processor itself .
But I have not found any support for ttyS2 and ttyS3 with angstrom linux
package .

Please let me How I can add support for ttyS2 & ttyS3 ??

Hi,

If you look into the following file arch/arm/mach-at91/"boardname".c, you may
easily parameterize additional ports by adding them to the function ek_map_io.
Simply add a call like this:

/* USART1 on ttyS2. (Rx, Tx, RTS, CTS) */
at91_register_uart(AT91SAM9260_ID_US1, 2, ATMEL_UART_CTS | ATMEL_UART_RTS);

Best regards
Erik Sandbraaten