Hi Philip, On Mon, 8 Dec 2014 20:41:12 +0000 Philip Boucherat wrote: > Thanks for replying. Not sure how to reply on the spinics.net mailing list, > but will update on archlinux mailing list. Reply-To-All should be sufficient. Mailinglist is @vger.kernel.org. > Anyway, am making some progress, I just ran your test program and the chip > is detected ok : > > Calling ioperm(4e, 2, 1): 0 (Success) > > Activating configuration mode. > > Global registers: > Software Reset (0x02): 0x0 > Logic Device Select (0x07): 0x3 > Device ID (0x20, 0x21): 0x28 > Vendor ID (0x23, 0x24): 0x1934 > Clock Source Select (0x25): 0x0 > Test mode (0x2f): 0x0 > > UART 1 registers: > Logic Device Select (0x07): 0x0 > Device Enable (0x30): 0x0 > I/O Port Select (0x60, 0x61): 0x00 > IRQ Channel Select (0x70): 0x0 > Clock Select (0xf0): 0x0 > IR1 Control (0xf1): 0x44 > > UART 2 registers: > Logic Device Select (0x07): 0x1 > Device Enable (0x30): 0x0 > I/O Port Select (0x60, 0x61): 0x00 > IRQ Channel Select (0x70): 0x0 > Clock Select (0xf0): 0x0 > > UART 3 registers: > Logic Device Select (0x07): 0x2 > Device Enable (0x30): 0x0 > I/O Port Select (0x60, 0x61): 0x00 > IRQ Channel Select (0x70): 0x0 > Clock Select (0xf0): 0x0 > > UART 4 registers: > Logic Device Select (0x07): 0x3 > Device Enable (0x30): 0x0 > I/O Port Select (0x60, 0x61): 0x00 > IRQ Channel Select (0x70): 0x0 > Clock Select (0xf0): 0x0 > Leaving configuration mode. So everything is disabled/uninitialized... > 8250_pnp is not finding the ports, but I think that's because I can't seem > to change the BIOS settings on this board, there is an option to enable PnP > for these UARTs but if I change this setting it always reverts to disabled. > However, now I know the device is accessible, I should be able to do > something about it, but if you can give any more advice that would be great! Weird. In case it helps, in 3.18 there is a new driver for f81216a which at least aims at making RS485 features available/configurable. Looking at its code though it's depending on the ports being registered as PNP0501 devices. What do the PNP settings for the ports look like in BIOS interface? Does the manual tell something about them? It would be preferred to be able to enable them in BIOS! Maybe ask your mainboard vendor for help, if it's a BUG in their BIOS they might release a new BIOS revision (possibly without admitting the issue). Cheers, Bruno > Cheers, Phil > > > On 5 December 2014 at 11:57, Bruno Prémont wrote: > > Hi Philip, > > > > With that information I can, at best, only provide some very limited > > guidance. > > > > On 4 December 2014 at 23:26, Philip Boucherat wrote: > > > Sorry for the unsolicited email, but it seems like you may be able to > > help > > > me. > > > > Try to always CC subsystem mailing list, that way someone else hitting your > > issue will be able to find the solution or at least can chime in. > > > > > I am working with an x86_64 board which has got an F81216 quad UART > > > chip on it and I need to get these serial ports to work. > > > > > > I'm doing a arch linux build of the 3.17 kernel (I think) and have > > enabled > > > 8250_PNP or whatever it is (sorry, haven't got access to my dev machine > > at > > > the moment), but it is not detecting the serial ports. > > > > > > This is a Intel Atom E3800 and the lpc_ich module is loaded, PCU is > > > detected when I do lspci, so I'm kind of thinking it should all work, but > > > it's not. Ports not detected at all. > > > > If you could provide kernel log (dmesg) and a reference to the mainboard > > documentation that might already help. > > The CPU/SOC documentation is not that helpful. > > > > From the software side, your best bet would be to start poking at the IO > > space to see if the F81216 is responding/reachable. > > If it's not, maybe you need to power it up using some GPIO, though that > > information should hopefully be present in the mainboard's Datasheet. > > > > Datasheet of the F81216: > > http://www.fintek.com.tw/files/productfiles/F81216_V035P.pdf > > My test code as written years ago: > > https://bugzilla.kernel.org/show_bug.cgi?id=13008#c9 > > (also read comment #11 for the second configuration address > > and adjust text code accordingly when testing!) > > > > Please post the output from test program for both IO ports (0x4e and 0x2e). > > > > > Do I need to do some extra kernel config? Do I need to add your platform > > > driver to the kernel build? > > > > If BIOS/firmware has setup the mainboard and all resources you don't need > > any specific kernel config (except not limiting UART count too much): > > CONFIG_SERIAL_8250_NR_UARTS > > CONFIG_SERIAL_8250_RUNTIME_UARTS > > > > If the UARTs are not reported as PNP resources 8250_PNP will not find them > > and you will need some extra work to get them hooked up (probably a > > platform driver to write). > > > > Cheers, > > Bruno > > > > > > > Any help very much appreciated! > > > > > > Cheers Phil > > -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
