All-
Thanks to Martin and Philippe - both of your solutions work (presumably
using different UARTs connected to the same pins?)
For anyone else who runs into this problem, here are the solutions:
Option 1:
Use the PCH UART (/dev/ttyPCH0) - this requires the pch_uart driver (as
module or compiled-in kernel - CONFIG_SERIAL_PCH_UART).
Option 2:
Compile without the PCH UART driver (CONFIG_SERIAL_PCH_UART is not set)
and then serial8250 picks the device up (as /dev/ttyS1).
I greatly appreciate the help everyone gave me! Have a happy New Year.
-Toby
On 12/30/2014 11:44 AM, Martin Sofaru wrote:
Hi Toby,
On 30/12/14 16:25, Toby Schneider wrote:
All -
I cannot get Linux to recognize the second serial port on the net6501.
I'm running a Debian Wheezy root filesystem, and tried several kernels
(including one I built). None of them will register a second serial port
(presumably would be /dev/ttyS1):
I simply do the following on Debian Wheezy amd64:
echo "pch_uart" >>/etc/modules
After that I can simply use the second serial port as /dev/ttyPCH0.
I have the console on ttyS0 and control the second net6501 on ttyPCH0.
For reference, I use the following kernel options:
console=ttyS0,19200 elevator=noop intel_idle.max_cstate=1 pcie_aspm=off
8250.nr_uarts=2 i8042.noaux i8042.nokbd
Best regards,
Martin
== Linux 3.2.0 (debian wheezy stock) ==
mituser@polpo-2014-11-12:~$ uname -a
Linux polpo-2014-11-12 3.2.0-4-686-pae #1 SMP Debian 3.2.63-2 i686
GNU/Linux
mituser@polpo-2014-11-12:~$ dmesg | grep tty
[ 0.000000] Kernel command line:
BOOT_IMAGE=/boot/vmlinuz-3.2.0-4-686-pae
root=UUID=bda2c665-6b64-4815-8dde-ca9c6915be54 ro console=tty1
console=ttyS0,57600n8 acpi=off
[ 0.000000] console [tty1] enabled
[ 0.000000] console [ttyS0] enabled
[ 2.796353] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a TI16750
[ 12.462436] ttyS1: LSR safety check engaged!
[ 12.465707] ttyS1: LSR safety check engaged!
[ 12.485800] ttyS2: LSR safety check engaged!
[ 12.501702] ttyS2: LSR safety check engaged!
== Linux 3.16.0 (debian wheezy backports) ==
mituser@polpo-2014-11-12:~$ uname -a
Linux polpo-2014-11-12 3.16.0-0.bpo.4-686-pae #1 SMP Debian
3.16.7-ckt2-1~bpo70+1 (2014-12-08) i686 GNU/Linux
mituser@polpo-2014-11-12:~$ dmesg | grep tty
[ 0.000000] Kernel command line:
BOOT_IMAGE=/boot/vmlinuz-3.16.0-0.bpo.4-686-pae
root=UUID=bda2c665-6b64-4815-8dde-ca9c6915be54 ro console=tty1
console=ttyS0,57600n8 acpi=off
[ 0.000000] console [tty1] enabled
[ 0.000000] console [ttyS0] enabled
[ 2.972377] serial8250: ttyS0 at I/O 0x3f8 (irq = 4, base_baud =
115200) is a TI16750
[ 8.442372] 0000:02:0a.1: ttyPCH0 at I/O 0x1040 (irq = 65, base_baud
= 0) is a pch_uart
[ 8.669015] 0000:02:0a.2: ttyPCH1 at I/O 0x1048 (irq = 67, base_baud
= 0) is a pch_uart
[ 8.680706] 0000:02:0a.3: ttyPCH2 at I/O 0x1050 (irq = 68, base_baud
= 0) is a pch_uart
[ 8.692644] 0000:02:0a.4: ttyPCH3 at I/O 0x1058 (irq = 69, base_baud
= 0) is a pch_uart
There seems to be some history, but it seems that no resolution was found:
http://lists.soekris.com/pipermail/soekris-tech/2013-August/019044.html
Any help is greatly appreciated. I assume this second uart would be
handled by the linux serial8250 driver.
Thanks-
-Toby
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