* [Buildroot] /dev/ttyprinkt usage in BR
@ 2011-01-12 15:43 Yegor Yefremov
2011-01-12 16:02 ` Peter Korsgaard
0 siblings, 1 reply; 3+ messages in thread
From: Yegor Yefremov @ 2011-01-12 15:43 UTC (permalink / raw)
To: buildroot
As of kernel 2.6.37 there is a new pseudo tty device /dev/ttyprinkt, that can make user output through pritnk() routine. How can it be used in BR? What entries should /etc/inittab contain to redirect the console output to /dev/ttyprinkt?
Best regards,
Yegor
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Buildroot] /dev/ttyprinkt usage in BR
2011-01-12 15:43 [Buildroot] /dev/ttyprinkt usage in BR Yegor Yefremov
@ 2011-01-12 16:02 ` Peter Korsgaard
2011-01-12 16:52 ` Yegor Yefremov
0 siblings, 1 reply; 3+ messages in thread
From: Peter Korsgaard @ 2011-01-12 16:02 UTC (permalink / raw)
To: buildroot
>>>>> "Yegor" == Yegor Yefremov <yegor_sub1@visionsystems.de> writes:
Yegor> As of kernel 2.6.37 there is a new pseudo tty device
Yegor> /dev/ttyprinkt, that can make user output through pritnk()
Yegor> routine. How can it be used in BR? What entries should
Yegor> /etc/inittab contain to redirect the console output to
Yegor> /dev/ttyprinkt?
I haven't used it yet, but I guess the only thing you have to do to get
all console output though it is to use devtmpfs (or add the device node
in device_table.txt), and tell init to use it as console. Looking at the
busybox init code, I see it gets the console device from the CONSOLE or
console environment variables, so you would just have to add
CONSOLE=/dev/ttyprintk to the kernel commandline.
Using console=/dev/ttyprintk will probably cause strange behaviour as
that presumably creates a loop, where every kernel message is sent back
in and reprinted.
But again, completely untested.
--
Bye, Peter Korsgaard
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Buildroot] /dev/ttyprinkt usage in BR
2011-01-12 16:02 ` Peter Korsgaard
@ 2011-01-12 16:52 ` Yegor Yefremov
0 siblings, 0 replies; 3+ messages in thread
From: Yegor Yefremov @ 2011-01-12 16:52 UTC (permalink / raw)
To: buildroot
> Yegor> As of kernel 2.6.37 there is a new pseudo tty device
> Yegor> /dev/ttyprinkt, that can make user output through pritnk()
> Yegor> routine. How can it be used in BR? What entries should
> Yegor> /etc/inittab contain to redirect the console output to
> Yegor> /dev/ttyprinkt?
>
> I haven't used it yet, but I guess the only thing you have to do to get
> all console output though it is to use devtmpfs (or add the device node
> in device_table.txt), and tell init to use it as console. Looking at the
> busybox init code, I see it gets the console device from the CONSOLE or
> console environment variables, so you would just have to add
> CONSOLE=/dev/ttyprintk to the kernel commandline.
Device creation is not a problem. If I change the console in /etc/inittab from ttyAM0 to ttyprintk I get
[U]
[U]
[U] Welcome to Buildroot
[U]
but no prompt.
Best regards,
Yegor
^ permalink raw reply [flat|nested] 3+ messages in thread
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2011-01-12 15:43 [Buildroot] /dev/ttyprinkt usage in BR Yegor Yefremov
2011-01-12 16:02 ` Peter Korsgaard
2011-01-12 16:52 ` Yegor Yefremov
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