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From: "V. ANANDA KRISHNAN" <mansarov@us.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: gregkh@suse.de, rmk@arm.linux.org.uk
Subject: Serial core: 8250_pci could not register serial port for  UART chip EXAR XR17D152
Date: Thu, 14 Jul 2005 11:47:29 -0500	[thread overview]
Message-ID: <1121359649.15007.18.camel@siliver.austin.ibm.com> (raw)

Hi all,

  I have been coming across a problem with my serial port EXAR chip XR
17D152, when I try to use the 8250_pci driver.  I am using
kernel-2.6.12.1 on RHEL4.0-U1 on pSeries box with 4-cpu.  8250_pci
during the boot time, after detecting the exar chip (I checked with the
pci_dev structure and the pci_device_id structure for the info), is
unable to get thru the port registration (static int
__devinit_pciserial_init_one(struct pci_dev *dev, const struct
pci_device_id *ent) procedure in 8250_pci.c).  I debugged the problem
and traced upto the routine "static int uart_match_port(struct uart_port
*port1, struct uart_port *port2" in 8250.c where UPIO_MEM is not
satisfying the condition port1->membase==port2->membase and hence
returns 0.

  If I use the printk for dumping the port-> membase value the system
hags during the boot time with a blank screen (on the serial terminal).
I am yet to try with kernel-2.6.12.2.  Please let me know how to proceed
in this case.  Thanks,
V.Ananda Krishnan


             reply	other threads:[~2005-07-14 16:53 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-07-14 16:47 V. ANANDA KRISHNAN [this message]
2005-07-16  8:38 ` Russell King

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