Messages in this thread | | | Date | Mon, 15 Aug 2005 17:41:26 +0100 | From | Russell King <> | Subject | Re: uart_port structure in serial8250_port[i] doesn't have the port_type values |
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On Mon, Aug 15, 2005 at 11:33:39AM -0500, V. Ananda Krishnan wrote: > Thanks for your guidance. Here is the cat of /proc/tty/driver/serial: > serinfo:1.0 driver revision: > 0: uart:16550A port:000003F8 irq:4 tx:11963 rx:0 RTS|DTR > 1: uart:16550A port:000002F8 irq:3 tx:11 rx:0 > 2: uart:16550A port:00000898 irq:14 tx:0 rx:0 > 3: uart:16550A port:00000890 irq:15 tx:0 rx:0 > > On Mon, 2005-08-15 at 17:11 +0100, Russell King wrote: > > Without this, I can only conclude from your above description that > > all available 8250 ports are already associated with some hardware, > > and therefore the 8250 driver is working as designed.
and this is indeed the problem. The 8250 driver already has 4 hardware ports already registered.
Obviously, if you have 5 serial ports in the machine and you ask the driver to only allow 4 ports, it's sensible that you'd get an ENOSPC error when you try to register the 5th port.
So, if you have 5 ports in the machine, why not try setting CONFIG_SERIAL_8250_NR_UARTS to at least 5? Or if you have 6, set it to at least 6. etc.
Sorry, but I feel like I'm explaining The Damned Obvious(tm) here, especially as I've hinted towards CONFIG_SERIAL_8250_NR_UARTS twice in this thread already.
-- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 Serial core - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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