Hello, In Linux there is no way to set the number of tty devices or console to create. By default the kernel create 64 /dev/tty devices. what is too much for embedded system with limited resources. As all these 64 devices are not necessary or mandatory for the kernel proper working, I add a config option to set the desired tty. The lowest number you can set is 1 and the highest is 63, any value respectively below or above that, will cause a kconfig invalid entry pop-up.
Please keep me update. Best Regards
From 430deaf09da90bf0da03b7ca612cd4481ad30fea Mon Sep 17 00:00:00 2001 From: Pierre Paul MINGOT <[email protected]> Date: Thu, 22 Jan 2015 17:51:49 +0100 Subject: [PATCH] In Linux there is no way to set the number of tty devices or console to create. By default the kernel create 64 /dev/tty devices. what is too much for embedded system with limited resources. As all these 64 devices are not necessary or mandatory for the kernel proper working, I add a config option to set the desired tty. The lowest number you can set is 1 and the highest is 63, any value respectively below or above that, will cause a kconfig invalid entry pop-up. Signed-off-by: Pierre Paul MINGOT <[email protected]> --- drivers/tty/Kconfig | 14 ++++++++++++++ include/uapi/linux/vt.h | 4 ++-- 2 files changed, 16 insertions(+), 2 deletions(-) diff --git a/drivers/tty/Kconfig b/drivers/tty/Kconfig index b24aa01..0ec58a2 100644 --- a/drivers/tty/Kconfig +++ b/drivers/tty/Kconfig @@ -75,6 +75,19 @@ config VT_CONSOLE_SLEEP def_bool y depends on VT_CONSOLE && PM_SLEEP +config NR_TTY_DEVICES + int "Maximum tty device number" + depends on VT + range 1 63 + default 1 + ---help--- + This is the highest numbered device created in /dev. You will actually have + NR_TTY_DEVICES+1 devices in /dev. The default is 63, which will result in + 64 /dev entries. The lowest number you can set is 1 and the highest is 63, + anything respectively below or above that, is not possible and will cause + a kconfig invalid entry pop-up. + So the default value will be set. + config HW_CONSOLE bool depends on VT && !UML @@ -419,4 +432,5 @@ config DA_CONSOLE help This enables a console on a Dash channel. + endif # TTY diff --git a/include/uapi/linux/vt.h b/include/uapi/linux/vt.h index 978578b..2140496 100644 --- a/include/uapi/linux/vt.h +++ b/include/uapi/linux/vt.h @@ -7,8 +7,8 @@ * resizing). */ #define MIN_NR_CONSOLES 1 /* must be at least 1 */ -#define MAX_NR_CONSOLES 63 /* serial lines start at 64 */ -#define MAX_NR_USER_CONSOLES 63 /* must be root to allocate above this */ +/* serial lines start at 64 */ +#define MAX_NR_CONSOLES CONFIG_NR_TTY_DEVICES +/* must be root to allocate above this */ +#define MAX_NR_USER_CONSOLES CONFIG_NR_TTY_DEVICES /* Note: the ioctl VT_GETSTATE does not work for consoles 16 and higher (since it returns a short) */ -- 1.9.1
