TTL (COM3) in Ubuntu

[roboard]

...The details for our kernel configuring and building should be answered by our Linux engineer, who is on vacation this week. We will ask him to mention the details next week.

Hi gdo,

the following is the answer from our Linux engineer:

No kernel source is modified for COM3/COM4. We only set the following configuration for RoBoard's native COM before builing the kernel:

CONFIG_SERIAL_8250_NR_UARTS=8
CONFIG_SERIAL_8250_RUNTIME_UARTS=2

[gdo]

All is ok for me !

Thanks

[afiebig]

Hi, I'm fairly new to this forum and would like to make a few
questions related to this thread.

I've configured COM3 and COM4 as shown in the previous post

Also, I'm not sure if it's normal, but I have to rerun setserial every time the Roboard boots. Does setserial not save the configuration?

The problem is that when my Debian boot it says

Code: Select all

Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
serial8250: ttyS2 at I/O 0x3e8 (irq = 4) is a 16550A
serial8250: ttyS3 at I/O 0x2e8 (irq = 3) is a 16550A


here I see that they share the same IRQ, if I use setserial the irq changes, but I'm not sure these changes will work until the roboard restarts.

so, there is my problem, i'm using ttyS0 for console redirect, and i need to use the ttyS2 for AX-12 Control, but their share the same IRQ.

Hope you can help me

[gdo]

Have a look at /etc/serial.conf.

That's were you can save your setserial configuration.

gdo

[afiebig]

Hi, thanks for your advice, but i have no /etc/serial.conf

Now I realise that the IRQ are coded on the
<linux_kernel_source_dir>/arch/alpha/include/asm/serial.h

it goes somethin like this:

Code: Select all

/*UART CLK PORT IRQ FLAGS */
{0, BASE_BAUD, 0x3f8, 4, STD_COM_FLAGS}, /* ttyS0 */
{0, BASE_BAUD, 0x2f8, 3, STD_COM_FLAGS}, /* ttyS1 */
{0, BASE_BAUD, 0x3e8, 4, STD_COM_FLAGS}, /* ttyS2 */
{0, BASE_BAUD, 0x2e8, 3, STD_COM4_FLAGS}, /* ttyS3 */


so i change that and i'm compiling my kernel.

[gdo]

Hi, thanks for your advice, but i have no /etc/serial.conf

Normal you have to create it.
The default configuration file is : /var/lib/setserial/autoserial.conf
You could modify this one directly but I prefer to use /etc/serial.conf instead.
But be careful, if /etc/serial.conf exists, /var/lib/setserial/autoserial.conf is not used

Now I realise that the IRQ are coded on the
<linux_kernel_source_dir>/arch/alpha/include/asm/serial.h

it goes somethin like this:

Code: Select all

/*UART CLK PORT IRQ FLAGS */
{0, BASE_BAUD, 0x3f8, 4, STD_COM_FLAGS}, /* ttyS0 */
{0, BASE_BAUD, 0x2f8, 3, STD_COM_FLAGS}, /* ttyS1 */
{0, BASE_BAUD, 0x3e8, 4, STD_COM_FLAGS}, /* ttyS2 */
{0, BASE_BAUD, 0x2e8, 3, STD_COM4_FLAGS}, /* ttyS3 */


so i change that and i'm compiling my kernel.

Yes it is an other good solution.

Good luck,
gdo