From: Gary Thomas <gary@mlbassoc•com>
To: Linux PPC Development <linuxppc-dev@ozlabs•org>
Cc: Timur Tabi <timur@freescale•com>
Subject: UCC UART
Date: Tue, 22 Jun 2010 08:55:07 -0600 [thread overview]
Message-ID: <4C20CECB.9050609@mlbassoc.com> (raw)
I'm still trying to get UCC UART to work on my MPC8358 with
the 2.6.33.3 kernel.
When I try to send data to the port, there is no output, not
even any interrupts on the device. What I see is that the UART
driver seems to initialize fine and pushes characters into
the output buffers & descriptors. However, there are no
interrupts hence it just sits there...
My device tree entry for this device now looks like this:
/* ttyQE0 (UCC3) */
serial_qe0: serial@4000 {
device_type = "serial";
compatible = "ucc_uart";
cell-index = <3>;
reg = <0x2200 0x200>;
interrupts = <34>;
interrupt-parent = <&qeic>;
port-number = <0>;
rx-clock-name = "brg1";
tx-clock-name = "brg1";
};
* Are there any known issues with this driver?
* Is there any way to get a handle on why no data is moving?
* Is there some way to tell if the QE even sees the descriptors?
* The driver and documentation mention a "soft UART" mode for
chips with broken UART hardware. How do I know if my board
has functioning UART hardware?
Note: I have UCC1+UCC2 working great with ethernet.
Thanks for any pointers or ideas
--
------------------------------------------------------------
Gary Thomas | Consulting for the
MLB Associates | Embedded world
------------------------------------------------------------
next reply other threads:[~2010-06-22 14:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-22 14:55 Gary Thomas [this message]
2010-06-22 15:06 ` UCC UART Tabi Timur-B04825
2010-06-22 15:10 ` Chuck Meade
2010-06-22 15:14 ` Gary Thomas
2010-06-22 15:28 ` Chuck Meade
2010-06-22 15:46 ` Gary Thomas
2010-06-22 15:53 ` Chuck Meade
2010-06-22 17:44 ` Gary Thomas
2010-06-22 18:14 ` Chuck Meade
2010-06-22 18:41 ` Gary Thomas
2010-06-22 19:01 ` Chuck Meade
2010-06-22 21:19 ` Gary Thomas
2010-06-22 21:27 ` Chuck Meade
[not found] ` <4C20D162.2020302@freescale.com>
2010-06-24 21:20 ` Timur Tabi
2010-06-25 0:49 ` Gary Thomas
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