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Howto add serial port to WL-500gx/gp
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Thread: Howto add serial port to WL-500gx/gp

  1. #1
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    Post Howto add serial port to WL-500gx/gp

    The Asus wl500g deluxe has uart pinout onboard, so 2 serial ports can be added to the unit.
    The only difference between wl500g and wl500gx that the deluxe does not require a UART chip, so a simple RS232 transceiver will do the trick.

    Here are my experiences adding a single serial port to the router
    The parts you need:
    - 1 MAX3232 IC (SO-IC)
    - 5 1uF capacitors
    - cables, connectors

    I attached the PCB layout I made, and a few pictures that might help.
    There are 2 jumpers on the pcb, which switches between the Tx-Rx, so it doesn't matter what kind of serial cable you actually use.
    Good juper configurations:
    ._ ._ and _. _.
    Don't mix them! Next time i'm going to use a switch instead

    You need to connect the router's 3.3v, GND, UART_TX0, UART_RX0 pins to the left side of the pcb, set the jumpers, and connect a DB9 connector to the right side.

    Note: Actually i was able to add the serial port without actually removing the warranty sticker. I left the screw with the sticker untouched, and stretched the unit just enough to get the connector on the pins.

    Important: Don't try this, unless you know what you are doing. I take no responsibility for damaging your router

    Code:
    CFE version 1.0.37 for BCM947XX (32bit,SP,LE)
    Build Date: ¤*  7¤ë 16 19:48:38 CST 2004 (root@PaNLinux)
    Copyright (C) 2000,2001,2002,2003 Broadcom Corporation.
    
    Initializing Arena.
    Initializing Devices.
    et0: Broadcom BCM47xx 10/100 Mbps Ethernet Controller 1.3.2.0
    rndis0: Broadcom USB RNDIS Network Adapter (P-t-P)
    CPU type 0x29007: 200MHz
    Total memory: 0x1000000 bytes (16MB)
    
    Total memory used by CFE:  0x80300000 - 0x80436CF0 (1273072)
    Initialized Data:          0x803311B0 - 0x80333540 (9104)
    BSS Area:                  0x80333540 - 0x80334CF0 (6064)
    Local Heap:                0x80334CF0 - 0x80434CF0 (1048576)
    Stack Area:                0x80434CF0 - 0x80436CF0 (8192)
    Text (code) segment:       0x80300000 - 0x803311B0 (201136)
    Boot area (physical):      0x00437000 - 0x00477000
    Relocation Factor:         I:00000000 - D:00000000
    
    Device eth0:  hwaddr 00-11-D8-XX-XX-XX, ipaddr 192.168.1.1, mask 255.255.255.0
            gateway not set, nameserver not set
    Rescue Flag disable.
    Reading :: TFTP Server.
    Failed.: Timeout occured
    Loader:raw Filesys:raw Dev:flash0.os File: Options:(null)
    Loading: ...... 1748992 bytes read
    Entry at 0x80001000
    Closing network.
    Starting program at 0x80001000
    CPU revision is: 00029007
    
    Primary instruction cache 8kB, physically tagged, 2-way, linesize 16 bytes.
    
    Primary data cache 4kB, 2-way, linesize 16 bytes.
    
    Linux version 2.4.29 (josephus@arrakis) (gcc version 3.3.5) #1 Sun Mar 6 02:01:59 CET 2005
    Attached Images Attached Images    
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    Josephus
    HuWiCo - Hungarian Wireless Community
    http://www.huwico.hu

  2. #2
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    Location
    Adelaide, Australia
    Posts
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    WL500gx serial port success

    I have successfully connected to the serial port on J5.

    I've used a small converter board from a usb->serial cable (an old phone data cable), and will mount that board inside the case, with just a USB device port added to the back panel. Pictures later ...

    Here is the output from the serial console on boot (running Oleg's firmware).

    Code:
    CFE version 1.0.37 for BCM947XX (32bit,SP,LE)
    Build Date: ¤G  3¤ë  1 16:49:41 CST 2005 (root@PaNLinux)
    Copyright (C) 2000,2001,2002,2003 Broadcom Corporation.
    
    Initializing Arena.
    Initializing Devices.
    et0: Broadcom BCM47xx 10/100 Mbps Ethernet Controller 1.3.2.0
    rndis0: Broadcom USB RNDIS Network Adapter (P-t-P)
    CPU type 0x29007: 200MHz
    Total memory: 0x2000000 bytes (32MB)
    
    Total memory used by CFE:  0x80300000 - 0x80436F10 (1273616)
    Initialized Data:          0x803313D0 - 0x80333760 (9104)
    BSS Area:                  0x80333760 - 0x80334F10 (6064)
    Local Heap:                0x80334F10 - 0x80434F10 (1048576)
    Stack Area:                0x80434F10 - 0x80436F10 (8192)
    Text (code) segment:       0x80300000 - 0x803313D0 (201680)
    Boot area (physical):      0x00437000 - 0x00477000
    Relocation Factor:         I:00000000 - D:00000000
    
    Device eth0:  hwaddr 00-11-D8-??-??-??, ipaddr 192.168.??.??, mask 255.255.255.0
            gateway not set, nameserver not set
    Rescue Flag disable.
    Reading :: TFTP Server.
    Failed.: Timeout occured
    Loader:raw Filesys:raw Dev:flash0.os File: Options:(null)
    Loading: .. 3560 bytes read
    Entry at 0x80001000
    Closing network.
    Starting program at 0x80001000
    cpu probe
    prom init
    cpu report
    CPU revision is: 00029007
    Primary instruction cache 8kb, linesize 16 bytes (2 ways)
    Primary data cache 4kb, linesize 16 bytes (2 ways)
    Linux version 2.4.20 (root@omnibook) (gcc version 3.2.3 with Broadcom modifications) #62 Mon Mar 14 21:39:22 MSK 2005
    Setting the PFC value as 0x15
    Determined physical RAM map:
     memory: 02000000 @ 00000000 (usable)
    On node 0 totalpages: 8192
    zone(0): 8192 pages.
    zone(1): 0 pages.
    zone(2): 0 pages.
    Kernel command line: root=/dev/mtdblock2 noinitrd init=/linuxrc console=ttyS0,115200
    CPU: BCM5365 rev 1 at 200 MHz
    Calibrating delay loop... 199.47 BogoMIPS
    Memory: 30128k/32768k available (1755k kernel code, 2640k reserved, 220k data, 68k init, 0k highmem)
    Dentry cache hash table entries: 4096 (order: 3, 32768 bytes)
    Inode cache hash table entries: 2048 (order: 2, 16384 bytes)
    Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
    Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes)
    Page-cache hash table entries: 8192 (order: 3, 32768 bytes)
    Checking for 'wait' instruction...  unavailable.
    POSIX conformance testing by UNIFIX
    PCI: Fixing up bus 0
    PCI: Fixing up bridge
    PCI: Fixing up bus 1
    Linux NET4.0 for Linux 2.4
    Based upon Swansea University Computer Society NET3.039
    Initializing RT netlink socket
    Starting kswapd
    Journalled Block Device driver loaded
    devfs: v1.12c (20020818) Richard Gooch (rgooch@atnf.csiro.au)
    devfs: boot_options: 0x1
    NTFS driver v1.1.22 [Flags: R/O]
    pty: 256 Unix98 ptys configured
    Serial driver version 5.05c (2001-07-08) with MANY_PORTS SHARE_IRQ SERIAL_PCI enabled
    ttyS00 at 0xb8000300 (irq = 3) is a 16550A
    ttyS01 at 0xb8000400 (irq = 0) is a 16550A
    loop: loaded (max 8 devices)
    PPP generic driver version 2.4.2
    PPP Deflate Compression module registered
    PPP BSD Compression module registered
    MPPE/MPPC encryption/compression module registered
     Amd/Fujitsu Extended Query Table v1.1 at 0x0040
    number of CFI chips: 1
    Flash device: 0x400000 at 0x1c000000
    Physically mapped flash: squashfs filesystem found at block 936
    Creating 5 MTD partitions on "Physically mapped flash":
    0x00000000-0x00040000 : "pmon"
    0x00040000-0x003e0000 : "linux"
    0x000ea190-0x003e0000 : "rootfs"
    0x003f0000-0x00400000 : "nvram"
    0x003e0000-0x003f0000 : "config"
    sflash: found no supported devices
    NET4: Linux TCP/IP 1.0 for NET4.0
    IP Protocols: ICMP, UDP, TCP
    IP: routing cache hash table of 512 buckets, 4Kbytes
    TCP: Hash tables configured (established 2048 bind 4096)
    ip_conntrack version 2.1 (256 buckets, 2048 max) - 344 bytes per conntrack
    ip_conntrack_pptp version 1.9 loaded
    ip_nat_pptp version 1.5 loaded
    ip_tables: (C) 2000-2002 Netfilter core team
    ipt_time loading
    NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
    IPv6 v0.8 for NET4.0
    IPv6 over IPv4 tunneling driver
    NET4: Ethernet Bridge 008 for NET4.0
    802.1Q VLAN Support v1.7 Ben Greear <greearb@candelatech.com>
    All bugs added by David S. Miller <davem@redhat.com>
    FAT: bogus logical sector size 38400
    FAT: bogus logical sector size 38400
    NTFS: Unable to set blocksize 512.
    VFS: Mounted root (squashfs filesystem) readonly.
    Mounted devfs on /dev
    Freeing unused kernel memory: 68k freed
    Algorithmics/MIPS FPU Emulator v1.5
    eth0: Broadcom BCM47xx 10/100 Mbps Ethernet Controller 1.3.2.0
    robosw_attach_ocp: no Robo device on OCP bus
    PCI: Enabling device 01:03.0 (0004 -> 0006)
    eth1: Broadcom BCM4320 802.11 Wireless Controller 3.90.7.0
    device eth1 entered promiscuous mode
    eth0.1: No such device
    device eth0 entered promiscuous mode
    br0: port 2(eth0) entering learning state
    br0: port 1(eth1) entering learning state
    br0: port 2(eth0) entering forwarding state
    br0: topology change detected, propagating
    br0: port 1(eth1) entering forwarding state
    br0: topology change detected, propagating
    usb.c: registered new driver usbdevfs
    usb.c: registered new driver hub
    usb-uhci.c: $Revision: 1.275 $ time 20:26:03 Mar  3 2005
    usb-uhci.c: High bandwidth mode enabled
    PCI: Enabling device 01:02.0 (0000 -> 0001)
    usb-uhci.c: USB UHCI at I/O 0x100, IRQ 2
    usb-uhci.c: Detected 2 ports
    usb.c: new USB bus registered, assigned bus number 1
    hub.c: USB hub found
    hub.c: 2 ports detected
    PCI: Enabling device 01:02.1 (0000 -> 0001)
    usb-uhci.c: USB UHCI at I/O 0x120, IRQ 2
    usb-uhci.c: Detected 2 ports
    usb.c: new USB bus registered, assigned bus number 2
    hub.c: USB hub found
    hub.c: 2 ports detected
    usb-uhci.c: v1.275:USB Universal Host Controller Interface driver
    PCI: Enabling device 01:02.2 (0000 -> 0002)
    ehci_hcd 01:02.2: PCI device 1106:3104
    ehci_hcd 01:02.2: irq 2, pci mem c00af000
    usb.c: new USB bus registered, assigned bus number 3
    PCI: 01:02.2 PCI cache line size set incorrectly (0 bytes) by BIOS/FW, correcting to 32
    ehci_hcd 01:02.2: USB 2.0 enabled, EHCI 1.00, driver 2003-Dec-29/2.4
    hub.c: USB hub found
    hub.c: 4 ports detected
    usb.c: registered new driver usblp
    printer.c: v0.13: USB Printer Device Class driver
    usb.c: registered new driver audio
    audio.c: v1.0.0:USB Audio Class driver
    Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
    PCI devices found:
        Class 0501: PCI device 14e4:0800 (rev 1).
        Class 0200: PCI device 14e4:4713 (rev 1).
        Class 1000: PCI device 14e4:4718 (rev 1).
        Class 0c03: PCI device 14e4:4715 (rev 1).
        Class 0604: PCI device 14e4:0804 (rev 1).
        Class 0b30: PCI device 14e4:0816 (rev 1).
        Class 0500: PCI device 14e4:080f (rev 1).
        Class 0600: PCI device 14e4:5365 (rev 0).
        Class 0c03: PCI device 1106:3038 (rev 97).
        Class 0c03: PCI device 1106:3038 (rev 97).
        Class 0c03: PCI device 1106:3104 (rev 99).
        Class 0280: PCI device 14e4:4320 (rev 3).
    echo for PaN ::: &&&PaN
    Last edited by rwhitby; 13-04-2005 at 15:25.

  3. #3
    Join Date
    Dec 2004
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    NL CheeseCity (Gouda)
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    Hi,

    I was wondering if you manage to send output to your serial port.
    There is another thread about adding USB serial ports and all people I heard (including myself) trying to actually use the port found out that the wl500 reboots after sending a few characters to that port. Maybe you run into problems just like us actually using the port. Unfortunately I do not know of any fixes for this problem.

    Regards

    Peter

  4. #4
    Join Date
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    Location
    Adelaide, Australia
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    Quote Originally Posted by rwhitby
    I've used a small converter board from a usb->serial cable (an old phone data cable), and will mount that board inside the case, with just a USB device port added to the back panel. Pictures later ...
    Operation is confirmed, and here are the promised pictures. I left room between the ethernet ports and the new usb device port just in case I decide to add the extra two USB host ports later ...

    -- Rod
    Attached Images Attached Images    
    Last edited by rwhitby; 13-04-2005 at 15:24.

  5. #5
    Join Date
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    Delft, The Netherlands
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    It took me a few seconds to understand the config. Related to palbeda's remark, this set-up is the other way around. Where palbeda connected a serial<->USB to the USB port of the Asus, in this set-up you connect the serial of the asus to the USB of e.g. a PC. Therefore, no max232 voltage convertor is needed. On the other hand, for home automation applications, a native serial port on the ASUS is to be prefered.

  6. #6
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    Location
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    Quote Originally Posted by sodb
    It took me a few seconds to understand the config. Related to palbeda's remark, this set-up is the other way around. Where palbeda connected a serial<->USB to the USB port of the Asus, in this set-up you connect the serial of the asus to the USB of e.g. a PC. Therefore, no max232 voltage convertor is needed. On the other hand, for home automation applications, a native serial port on the ASUS is to be prefered.
    If you want a non-console serial port on the wl500g (e.g. for home automation), then the easiest way is to just plug in a pl2303-based usb to serial converter cable). I have sent Oleg a patch to enable such usage in his firmware, and I hope it will be included in the next version he releases.

    -- Rod

  7. #7
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    Quote Originally Posted by rwhitby
    If you want a non-console serial port on the wl500g (e.g. for home automation), then the easiest way is to just plug in a pl2303-based usb to serial converter cable). I have sent Oleg a patch to enable such usage in his firmware, and I hope it will be included in the next version he releases.

    -- Rod
    yes, pl2303 support would be in the next firmware. So it would be possible to connect some cellular phones, which use pl2303 in their data cables.

  8. #8
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    Serial port config

    I have a 500gx running 1.9.2.7-5a. Before opening the case and possible break warranty I wanted to check how the internal serials are controlled.
    I see the following:
    Code:
    [admin@wl500gx root]$ more /proc/tty/driver/serial
    serinfo:1.0 driver:5.05c revision:2001-07-08
    0: uart:16550A port:B8000300 irq:3 baud:115740 tx:630 rx:0 RTS|DTR
    1: uart:16550A port:B8000400 irq:0 tx:0 rx:0 CTS|DSR|CD
    That shows that two ports are available. Usually (in other Linux systsems) the serials devices have names /dev/ttyS0 and /dev/ttyS1. In de asus I only see /dev/tts/0 and /dev/tts/1.
    trying to set baud rate using busybox stty applet results in the following:
    Code:
    [admin@wl500gx harddisk]$ ./busybox stty 9600 < /dev/tts/0
    [admin@wl500gx harddisk]$ more /proc/tty/driver/serial
    serinfo:1.0 driver:5.05c revision:2001-07-08
    0: uart:16550A port:B8000300 irq:3 baud:9615 tx:630 rx:0 RTS|DTR
    1: uart:16550A port:B8000400 irq:0 tx:0 rx:0 CTS|DSR|CD
    It seems that the baud rate is only approximately set on the device. Probably accurate enough. Echoing some characters shows:
    Code:
    before
    0: uart:16550A port:B8000300 irq:3 baud:9615 tx:630 rx:0 RTS|DTR
    after echo "1234567890" > /dev/tts/0 it reads:
    0: uart:16550A port:B8000300 irq:3 baud:9615 tx:642 rx:0 RTS|DTR
    showing that the charaters are being transmitted.

    Stty changes can also be made to second port; however, echoing to the second port /dev/tts/1 results in a full hang-up of the system. Need to power cycle.

    Does anyone has experimence with sending/receiving messages through both the serials from the shell (thus not as default serial terminal at boot-up as is shown earlier in this thread)?

    Another question is about the logical levels of this interface. Is it based on 3.3V or normal TTL 5V signals? In other words, can I connect a normal MAX232 for the signal conversion between RS-232 and the uart ports of the WL500G?
    Last edited by sodb; 22-05-2005 at 09:12.

  9. #9
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    How to disable pmon on serial port

    I installed the MAX3232 on serial 0 (/dev/tts/0) and it worked immediately. I used a flat cable with a dual row connector and I was able, as suggested by Josephus, to hook the connector to the internal PCB connector without removing the middle 'guarantee' screw. I even could easely close the box again and lead the flat cable out of the side of the box.
    While booting I see the same messages in serial console as shown earlier in this thread. For some experiments I want to disable the console mapped to serial0. I read that console is enable in firmware (1.9.2.7-cr5). Does anyone know how to disable the console or how to kill the proces driving the consoleso that the serial port can be freed for own applications?
    I see output appearing in the terminal session when I do an echo "Hello" > /dev/tts/0 . I can even reset the terminal baud rate using busybox stty 9600 < /dev/tts/0 and output characters on this baudrate. However, as soon as I type a character in the serial terminal, the terminal is reset back to the original speed of 115200 baud as shown below
    Code:
    [admin@wl500gx harddisk]$ ./busybox stty 9600 < /dev/tts/0
    [admin@wl500gx harddisk]$ ./busybox stty -a < /dev/tts/0
    speed 9600 baud; rows 0; columns 0;
    intr = <undef>; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
    eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;
    werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;
    -parenb -parodd cs8 hupcl -cstopb cread clocal -crtscts
    -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon ixoff
    -iuclc -ixany -imaxbel
    opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
    -isig -icanon iexten -echo echoe echok -echonl -noflsh -xcase -tostop -echoprt
    echoctl echoke
    
    <type a Carriage Return in terminal session>
    
    [admin@wl500gx harddisk]$ ./busybox stty -a < /dev/tts/0
    speed 115200 baud; rows 0; columns 0;
    intr = <undef>; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
    eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;
    werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;
    -parenb -parodd cs8 hupcl -cstopb cread clocal -crtscts
    -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon ixoff
    -iuclc -ixany -imaxbel
    opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
    -isig -icanon iexten -echo echoe echok -echonl -noflsh -xcase -tostop -echoprt
    echoctl echoke
    It seems that a process whatches the serial port and resets its baudrate when receiving input. Any suggestions? I tried the second serial port (UART_RX1/TX1) , but as described earlier, the systems hangs as soon as output is sent to this port. Has that anything to to with IRQ 0 used by this port?
    Last edited by sodb; 01-06-2005 at 23:02.

  10. #10
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    Disable console

    I recompiled kernel with the following change in kernel.config
    Code:
    CONFIG_CMDLINE="root=/dev/mtdblock2 noinitrd init=/linuxrc console=null"
    Now the console is disabled and is free to use for own purposes. Directly writing and reading to and from device /dev/tts/0 works fine.
    Still, accessing second port /dev/tts/1 causes hang-up of asus.

  11. #11
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    have you disabled flow control on the tts/1?

  12. #12
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    It works!

    Hey, thanks Oleg,

    i just typed
    Code:
     /tmp/harddisk/busybox stty -crtscts   < /dev/tts/1
    and now I can input and output to /dev/tts/1. However, after disabling the console I actually did not try the second port anymore. Currently I can not reboot, but later I will check the status.
    This is what I see when doing
    Code:
    [admin@wl500gx root]$ more /proc/tty/driver/serial
    serinfo:1.0 driver:5.05c revision:2001-07-08
    0: uart:16550A port:B8000300 irq:3 baud:9615 tx:7 rx:0
    1: uart:16550A port:B8000400 irq:3 baud:115740 tx:49 rx:24 CTS|DSR|CD
    I wonder what caused the change from IRQ:0 to IRQ:3 for dev/tts/1? After reboot I will check defaults and compare. From the tx and rx counters one can see if the interface really works.
    Currently, I am happy with two simulaneous serial ports on the wl500gx.

  13. #13
    Can you check please both ports working well at the same time? If such, maybe the patching of the kernel with disabling IRQ masking at tts/1 when ttys/0 is a console port isn't a bad idea.
    I'll try o check 18xx GPL sources located on utilities CD, if Oleg didn't do so yet

  14. #14
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    On two sessions I started cat /dev/tts/0 and cat /dev/tts/1 respectively. Because I only have a single serial port on my laptop I can only test alternatevely. That works.
    Then I did a test where I connected Rx0 to Tx1 and Rx1 to Tx0. Then 4 sessions, 2 as described before, other two with echo commands to the respective ports. On echo from /tts/1 to /tts/0 works. When I issue an echo the other way around, the cat sessions keep scrolling and the echo sessions take a long time to finish. I can CRTL-C all the sessions. I think there is a conflict with the same IRQ3 for both lines. Is there another free IRQ available and could that be used for serial /tts/1?

  15. #15
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    Quote Originally Posted by sodb
    Is there another free IRQ available and could that be used for serial /tts/1?
    No, both uarts use the same irq.

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