Messages in this thread | | | Date | Tue, 3 Jun 2003 18:58:15 +0200 | From | Ruud Linders <> | Subject | Re: Serial port numbering (ttyS..) wrong for 2.5.61+ |
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Paul,
Setting SERIAL_DEBUG_PCI gives me this:
Serial: 8250/16550 driver $Revision: 1.90 $ IRQ sharing enabled ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A Setup PCI port: port bc00, irq 21, type 0 ttyS14 at I/O 0xbc00 (irq = 21) is a 16550A Setup PCI port: port bc08, irq 21, type 0 ttyS15 at I/O 0xbc08 (irq = 21) is a 16550A Setup PCI port: port bc10, irq 21, type 0 ttyS2 at I/O 0xbc10 (irq = 21) is a 16550A Setup PCI port: port bc18, irq 21, type 0 ttyS3 at I/O 0xbc18 (irq = 21) is a 16550A
Doesn't give us much more detail.
BTW, this is the entry in 8250_pci.c for the board in question: { PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_1077, PCI_ANY_ID, PCI_ANY_ID, 0, 0, pbn_b2_4_921600 },
Note that the ttyS's _are_ numbered in sequence in 2.4.20
On Mon, Jun 02, 2003 at 08:43:24PM +0200, Paul Rolland wrote: > Hello, > > > > When we add a port to the system, we try to find in order: > > > > - a port which matches the base address > > - a port which is unallocated > > > > Probably the easiest way to stop the "ttyS14" occuring would > > be to clear the port information at boot when we don't find a port. > > > >From 8250_pci.c, you have : > > /* > * Probe one serial board. Unfortunately, there is no rhyme nor reason > * to the arrangement of serial ports on a PCI card. > */ > > It seems that your board is reporting the parameters in such an order > that when looking for a port based on the IRQ, I/O port, ... the matching > one has id 14... > > You could see this more clearly by setting SERIAL_DEBUG_PCI > at line 1549 to activate the code : > #ifdef SERIAL_DEBUG_PCI > printk("Setup PCI port: port %x, irq %d, type %d\n", > serial_req.port, serial_req.irq, serial_req.io_type); > #endif > > that would report to you the order in which ports are found on > your system. > > Regards, > Paul > > > - > 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/ > - 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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