Hello all, I've just installed a multiport serial card released by an outfit called Syba. This is an 8 port serial-only card with an Octopus style breakout cable. The main chipset on it is an ITE IT8871F. I've got two questions on this: Is there a driver I should try force loading on it (and if so, what options to use)? And is there any useful testing I can do to report back to the LKML on this card? Thanks for your time, diagnostic output follows. Chris The following comes up from an 'lspci -vv' 01:06.0 Serial controller: PLX Technology, Inc.

• Usb 3.0 Pci Card Driver
• Pci Wireless Card Driver
• Download Driver Pci Card Sybase 8 Port

Unknown device 9016 (rev 01) (prog-if 02 16550) Subsystem: Unknown device 544e:0008 Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium TAbort- SERR. On Fri, Oct 05, 2007 at 05:31:05PM -0400, Chris Bergeron wrote: I've just installed a multiport serial card released by an outfit called Syba. This is an 8 port serial-only card with an Octopus style breakout cable. The main chipset on it is an ITE IT8871F.

Well 8250pci.c mentions IT8871, so it is probably 8250 style in interface then. I've got two questions on this: Is there a driver I should try force loading on it (and if so, what options to use)? And is there any useful testing I can do to report back to the LKML on this card?

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How many serial ports is your kernel configured to use? CONFIGSERIAL8250NRUARTS=16 CONFIGSERIAL8250RUNTIMEUARTS=4 That is from my Debian system's kernel, and it won't activate more than 4 ports automatically. It will allow up to 16 to be activated though. I don't remember what the boot command is to override those values to make the system look for more ports. Len Sorensen - To unsubscribe from this list: send the line 'unsubscribe linux-kernel' in the body of a message to More majordomo info at Please read the FAQ at Chris Bergeron 12:30. Lennart Sorensen wrote: On Fri, Oct 05, 2007 at 05:31:05PM -0400, Chris Bergeron wrote: I've just installed a multiport serial card released by an outfit called Syba. This is an 8 port serial-only card with an Octopus style breakout cable.

The main chipset on it is an ITE IT8871F. Well 8250pci.c mentions IT8871, so it is probably 8250 style in interface then. That's what I had thought too after a quick LKML search. Doing a bit more research (I'm starting to think the IT8871F on the chip is misleading) it looks like that support is for a single parallel multi I/O card (with the other 887x cards being serial/parport PCI cards). I've got two questions on this: Is there a driver I should try force loading on it (and if so, what options to use)?

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And is there any useful testing I can do to report back to the LKML on this card? How many serial ports is your kernel configured to use? The kernel I'm using has 16 for both the NRUARTS and RUNTIMEUARTS (these machines generally have a minimum of 4 ports). Dmesg doesn't show the kernel as recognizing the card and only ttyS0 and ttyS1 (the two onboard ports) show up on boot. Chris - To unsubscribe from this list: send the line 'unsubscribe linux-kernel' in the body of a message to More majordomo info at Please read the FAQ at Andrey Panin 03:00. On 278, 10 05, 2007 at 05:31:05PM -0400, Chris Bergeron wrote: Hello allI've just installed a multiport serial card released by an outfit called Syba.

This is an 8 port serial-only card with an Octopus style breakout cable. The main chipset on it is an ITE IT8871F. Are you sure? IIRC IT887x are PCI-ISA bridges with additional periphery and your lspci shows PLX chip.

Can you send complete lspci -vv output? Output of dmesg could be useful too. Andrey Panin Linux and UNIX system administrator PGP key: Chris Bergeron 10:10.

Andrey Panin wrote: On 278, 10 05, 2007 at 05:31:05PM -0400, Chris Bergeron wrote: Hello allI've just installed a multiport serial card released by an outfit called Syba. This is an 8 port serial-only card with an Octopus style breakout cable. The main chipset on it is an ITE IT8871F. Are you sure? IIRC IT887x are PCI-ISA bridges with additional periphery and your lspci shows PLX chip. Can you send complete lspci -vv output?

Output of dmesg could be useful too. I'm sure that's what it says on the largest chip on the PCI card. It could be that the other two chips are more relevant. The numbers from them are included below.

I've posted up a quick text only page with the diagnostic information from the system (full dmesg, lspci, etc) plus links to pictures of the board (since others might see something important that I'm not aware of). You can access that at One chip has 'ITE IT8871F 0641-AYS ZF1M04L' written on it, and the other two have a stylized celtic knot looking 'T' followed by 'TG16C554CJG FTA6M-001 0620-B'. To unsubscribe from this list: send the line 'unsubscribe linux-kernel' in the body of a message to More majordomo info at Please read the FAQ at Lennart Sorensen 12:10. Lennart Sorensen wrote: On Thu, Oct 11, 2007 at 01:02:12PM -0400, Chris Bergeron wrote: One chip has 'ITE IT8871F 0641-AYS ZF1M04L' written on it, and the other two have a stylized celtic knot looking 'T' followed by 'TG16C554CJG FTA6M-001 0620-B'. The 8871 is a single PCI parallel port, so certainly somehow they are controlling the two serial to parallel chips through that pci parallel port.

I included the diff of the files you had on your web page and the originals founds in 2.4.20 (which is what they claim they replace). I can't really tell if there is any code there to deal with their quad uart chip or not. I'll see if I can compile up the appropriate kernel and test it with that code to see if it includes something to drive the card then, for starters. Chris - To unsubscribe from this list: send the line 'unsubscribe linux-kernel' in the body of a message to More majordomo info at Please read the FAQ at Andrey Panin 05:20. On 284, 10 11, 2007 at 01:02:12PM -0400, Chris Bergeron wrote: Andrey Panin wrote: On 278, 10 05, 2007 at 05:31:05PM -0400, Chris Bergeron wrote: Hello allI've just installed a multiport serial card released by an outfit called Syba. This is an 8 port serial-only card with an Octopus style breakout cable. The main chipset on it is an ITE IT8871F.

Are you sure? IIRC IT887x are PCI-ISA bridges with additional periphery and your lspci shows PLX chip. Can you send complete lspci -vv output? Output of dmesg could be useful too. I'm sure that's what it says on the largest chip on the PCI card. It could be that the other two chips are more relevant. The numbers from them are included below.

I've posted up a quick text only page with the diagnostic information from the system (full dmesg, lspci, etc) plus links to pictures of the board (since others might see something important that I'm not aware of). You can access that at Can you try an attached patch? I hope it should at least detect UARTs on your board. Be ready that baudrate could be wrong, because we do not know what frequency is used to clock these UARTs.

One chip has 'ITE IT8871F 0641-AYS ZF1M04L' written on it, and the other two have a stylized celtic knot looking 'T' followed by 'TG16C554CJG FTA6M-001 0620-B'. Andrey Panin Linux and UNIX system administrator PGP key: Chris Bergeron 12:10.

Andrey Panin wrote: On 284, 10 11, 2007 at 01:02:12PM -0400, Chris Bergeron wrote: Andrey Panin wrote: On 278, 10 05, 2007 at 05:31:05PM -0400, Chris Bergeron wrote: Hello allI've just installed a multiport serial card released by an outfit called Syba. This is an 8 port serial-only card with an Octopus style breakout cable. The main chipset on it is an ITE IT8871F. Are you sure?

IIRC IT887x are PCI-ISA bridges with additional periphery and your lspci shows PLX chip. Can you send complete lspci -vv output? Output of dmesg could be useful too. I'm sure that's what it says on the largest chip on the PCI card. It could be that the other two chips are more relevant. The numbers from them are included below.

I've posted up a quick text only page with the diagnostic information from the system (full dmesg, lspci, etc) plus links to pictures of the board (since others might see something important that I'm not aware of). You can access that at Can you try an attached patch?

Usb 3.0 Pci Card Driver

I hope it should at least detect UARTs on your board. Be ready that baudrate could be wrong, because we do not know what frequency is used to clock these UARTs. Alright,finally had another machine to try the attached patch. I get an odd error regarding IRQ 17: 'irq 17: nobody cared (try booting with the 'irqpoll' option)' along with a long error message (but the kernel continues to load). Aside from that the ports now allow me to run a getty on them and the DTR line lights up on my serial tester (as it does with a working port) but the device on the other end doesn't function. I've updated the web page with lspci -vv and dmesg output. I can also post it here if that's desirable, just figured I'd save everyone the inbox flooding:).

Chris - To unsubscribe from this list: send the line 'unsubscribe linux-kernel' in the body of a message to More majordomo info at Please read the FAQ at Andrey Panin 23:50. This message apearred after firewire driver initialization and firewire chip shares IRQ with serial card. It's hard to say who is guilty here:) along with a long error message (but the kernel continues to load). Aside from that the ports now allow me to run a getty on them and the DTR line lights up on my serial tester (as it does with a working port) but the device on the other end doesn't function. Is it possible to connect two ports and run getty on one port and minicom on another?

We should check that UARTs are really working. I've updated the web page with lspci -vv and dmesg output. I can also post it here if that's desirable, just figured I'd save everyone the inbox flooding:). - Chris - Andrey Panin Linux and UNIX system administrator PGP key: Chris Bergeron 15:20. Andrey Panin wrote: Is it possible to connect two ports and run getty on one port and minicom on another? We should check that UARTs are really working. I used the on-board serial port as a known working control (after getting it to work with the other onboard serial port) to try and connect over to one of the Syba card ports (using Cutecom & getty).

The lines light up, but there's nothing getting sent from the 8-port as far as I can see. The onboard port works as I'd expect, the Syba (running getty identically from inittab) doesn't. Andrey Panin 23:00. On 290, 10 17, 2007 at 06:16:58 -0400, Chris Bergeron wrote: Andrey Panin wrote: Is it possible to connect two ports and run getty on one port and minicom on another? We should check that UARTs are really working. I used the on-board serial port as a known working control (after getting it to work with the other onboard serial port) to try and connect over to one of the Syba card ports (using Cutecom & getty). The lines light upbut there's nothing getting sent from the 8-port as far as I can see.

I missed this fscking 'Disabling IRQ #17' line in your dmesg. Can you try with firewire controller disabled somehow? - Andrey Panin Linux and UNIX system administrator PGP key: Chris Bergeron 10:10. Andrey Panin wrote: On 290, 10 17, 2007 at 06:16:58 -0400, Chris Bergeron wrote: Andrey Panin wrote: Is it possible to connect two ports and run getty on one port and minicom on another? We should check that UARTs are really working. I used the on-board serial port as a known working control (after getting it to work with the other onboard serial port) to try and connect over to one of the Syba card ports (using Cutecom & getty). The lines light upbut there's nothing getting sent from the 8-port as far as I can see.

Oh crap. I missed this fscking 'Disabling IRQ #17' line in your dmesg. Can you try with firewire controller disabled somehow? Ah, I forgot to make note of that. I did actually turn off Firewire in the BIOS. Assuming that worked (and it looks like it did) the following section probably contains the relevant bits.

Still getting the IRQ 17 error. I also have an 8 port PCI serial card with the 8871 chip on it and a breakout cable. It is identified as such on my machine: 01:02.0 Serial controller: PLX Technology, Inc.

Unknown device 9016 (rev 01) (prog-if 02 16550) Subsystem: Unknown device 544e:0008 Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium TAbort- SERR. On Mon, Oct 22, 2007 at 07:33:23PM +0400, Andrey Panin wrote: So the card probably generates screaming interrupt. I found some docs for IT887x chips, according to these docs IT887x have simple interrupt controller inside. Further investigation is needed. Can you post output of lspci -xxx? Is it possible they put a chip on to generate a PCI interrupt on perhaps PCIB on the slot from the serial chips directly, so that they didn't have to turn interrupts from the serial chips into a signal that forces the parallel port to generate an interrupt?

After all that would reduce latency, and if you use PCIA for the parallel port, PCIB for the first serial chip and PCIC for the second, you might get a much more efficient design, although the driver would have to register all those IRQs. What IRQ is each PCI device in that system using right now? Perhaps we could figure out what irq 17 would be on that PCI slot. Len Sorensen - To unsubscribe from this list: send the line 'unsubscribe linux-kernel' in the body of a message to More majordomo info at Please read the FAQ at Chris Bergeron 10:20. Andrey Panin wrote: On 291, 10 18, 2007 at 01:00:06 -0400, Chris Bergeron wrote: So the card probably generates screaming interrupt.

I found some docs for IT887x chips, according to these docs IT887x have simple interrupt controller inside. Further investigation is needed. Can you post output of lspci -xxx? Full output. The relevant part for the Syba card is probably: 01:08.0 Serial controller: PLX Technology, Inc.

On 295, 10 22, 2007 at 12:18:08PM -0400, Lennart Sorensen wrote: On Mon, Oct 22, 2007 at 07:33:23PM +0400, Andrey Panin wrote: So the card probably generates screaming interrupt. I found some docs for IT887x chips, according to these docs IT887x have simple interrupt controller inside. Further investigation is needed. Can you post output of lspci -xxx? Is it possible they put a chip on to generate a PCI interrupt on perhaps PCIB on the slot from the serial chips directly, so that they didn't have to turn interrupts from the serial chips into a signal that forces the parallel port to generate an interrupt? After all that would reduce latency, and if you use PCIA for the parallel port, PCIB for the first serial chip and PCIC for the second, you might get a much more efficient design, although the driver would have to register all those IRQs.

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I dont think so. IT887x has builtin interrupt controller which multiplexes 16 external IRQ pins with IRQs from builtin devices (parallel port, UARTs and GPIO) into single INTA# line. IT887x also contains 8-bit ISA-like bus and 16 chip select lines and it's all you need to glue UARTs to PCI bus.

I suspect that it's interrupt controller problem, probably edge/level triggered settings. What IRQ is each PCI device in that system using right now? Perhaps we could figure out what irq 17 would be on that PCI slot. Andrey Panin Linux and UNIX system administrator PGP key: Andrey Panin 08:50. On Sunday 28 October 2007 9:42:42 am Andrey Panin wrote: On 295, 10 22, 2007 at 01:14:14 -0400, Chris Bergeron wrote: Andrey Panin wrote: On 291, 10 18, 2007 at 01:00:06 -0400, Chris Bergeron wrote: So the card probably generates screaming interrupt.

I found some docs for IT887x chips, according to these docs IT887x have simple interrupt controller inside. Further investigation is needed. Can you point me to any of those IT887x docs? I haven't been able to dig any up myself.

Can you test an attached patch against 2.6.24-rc1? I tested basically the same patch against a current upstream tree, and the syba ports don't work, even with 'irqpoll'.

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