[oe] Serial Console name for i.mx31

[Bernard Mentink]

Hi,

Can anyone verify what the kernel command line option should be to use
the first imx31 uart? As far as I can tell it is
"console=ttymxc0,115200"

The reason I ask, is that I am seeing the kernel messages in the ram
kernel ring buffer, but not seing them come out the serial console.

I am porting linux to our own hardware which is similar to the LogicPD
LiteKit platform (I have compiled the kernel for this platform ..)

Debugging into the serial driver in ../drivers/serial/mx31  .. I see the
function init_serial_init() being called ( .. and it's printk message is
in the buffer) but I am not seeing the serial_imx_probe() being called
..

I do not understand the the registering of platform drivers enough to
work out how the kernel connects the diver with the hardware .... Can
someone enlighten me on how to debug this further ..... Or even better
just tell me to use the correct command line option and it all bursts
into life  :-)

Thanks,
Bernie 

In addition:

I added the earlyprintk command to the kernel command line and I do see
these messages. i.e:

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
Linux version 2.6.36.1 (bmentink at 2570-ArchBox) (gcc version 4.5.3
20110311 (prerelease) (GCC) ) #7 P
REEMPT Mon Aug 1 09:51:34 NZST 2011
CPU: ARMv6-compatible processor [4107b364] revision 4 (ARMv6TEJ),
cr=00c5387f
CPU: VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
Machine: LogicPD i.MX31 SOM
bootconsole [earlycon0] enabled
Memory policy: ECC disabled, Data cache writeback
Built 1 zonelists in Zone order, mobility grouping on.  Total pages:
32512
Kernel command line: console=ttymxc,115200
earlyprintk=serial,ttymxc0,115200,keep
PID hash table entries: 512 (order: -1, 2048 bytes)
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Memory: 128MB = 128MB total
Memory: 126744k/126744k available, 4328k reserved, 0K highmem
Virtual kernel memory layout:
    vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
    DMA     : 0xffc00000 - 0xffe00000   (   2 MB)
    vmalloc : 0xc8800000 - 0xf4000000   ( 696 MB)
    lowmem  : 0xc0000000 - 0xc8000000   ( 128 MB)
    modules : 0xbf000000 - 0xc0000000   (  16 MB)
      .init : 0xc0008000 - 0xc001e000   (  88 kB)
      .text : 0xc001e000 - 0xc02e1000   (2828 kB)
      .data : 0xc02f6000 - 0xc030c6e0   (  90 kB)
Hierarchical RCU implementation.
        RCU-based detection of stalled CPUs is disabled.
        Verbose stalled-CPUs detection is disabled.
NR_IRQS:180
MXC IRQ initialized
MXC GPIO hardware

So it seems there is nothing wrong with the "ttymxc0" port assignment
... It's just the main serial console is just not working ..
 
Cheers,
B.




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