[yocto] thud, beaglebone-yocto.conf: SERIAL_CONSOLES setting

[Heiko Schocher]

Hello Kevin,

Am 01.11.2018 um 03:18 schrieb Kevin Hao:
> On Wed, Oct 31, 2018 at 02:23:00PM +0100, Heiko Schocher wrote:
>> Hello all,
>>
>> just builded core-image-minimal with current head of thud branch for
>> the beaglebone-yocto machine, with linux 4.14.x LTS "Linux version 4.14.78",
>> installed the resulting sd card image and boot it, and get:
>>
>> INIT: Id "O0" respawning too fast: disabled for
>> 5 minutes
>>
>> Reason seems to be:
>>
>> meta-yocto-bsp/conf/machine/beaglebone-yocto.conf
>>
>> SERIAL_CONSOLES = "115200;ttyO0"
>>
>> shouldn't this be
>>
>> SERIAL_CONSOLES = "115200;ttyS0"
>>
>> With this fix, sd card image boot fine ... may I oversee seomthing
>> obvious ?
> 
> No, it should be 'ttyO0'. It is set by the omap serial driver. You can
> refer the following in platform_data/serial-omap.h:
>    #define OMAP_SERIAL_NAME        "ttyO"

Yes, you are right, but I see with linux kernel 4.14.78 from

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.14.y&id=e7405910ca5553eae8744af4e5c03e64ee048cb1

and I see:

[    0.000000] Linux version 4.14.78 (oe-user at oe-host) (gcc version 8.2.0 (GCC)) #1 Thu Nov 1 
10:51:09 UTC 2018
[    0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c5387d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] OF: fdt: Machine model: TI AM335x BeagleBone Black
[...]
[    0.362878] Serial: 8250/16550 driver, 6 ports, IRQ sharing disabled
[    0.365758] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 30, base_baud = 3000000) is a 8250
[    1.030465] console [ttyS0] enabled

So definitely a ttyS0 ...

bye,
Heiko
> 
> Thanks,
> Kevin
> 
>>
>> bye,
>> Heiko
>> -- 
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-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-52   Fax: +49-8142-66989-80   Email: hs at denx.de