Messages in this thread | | | Date | Fri, 9 Dec 2005 16:25:31 +0100 | From | Erik Mouw <> | Subject | Re: [PATCH] Adding ctrl-o sysrq hack support to 8250 driver |
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On Fri, Dec 09, 2005 at 03:05:59PM +0100, Olaf Hering wrote: > a POWER4 system in 'full-system-partition' mode has the console device > on ttyS0. But the user interface to the Linux system console may still > be on the hardware management console (HMC). If this is the case, there > is no way to send a break to trigger a sysrq. > Other setups do already use 'ctrl o' to trigger sysrq. This includes iSeries > virtual console on tty1, and pSeries LPAR console on hvc0 or hvsi0.
So it's a POWER4 problem.
> 'ctrl o' is currently mapped to 'flush output', see 'stty -a'
Eww... If you can't use a serial break, why can't you use an established control character like ctrl-] (telnet) or [enter]~ (ssh) ?
If you really want to use ctrl-o, could you make a way that pressing ctrl-o twice sends a single ctrl-o to the process attached to the console?
> Signed-off-by: Olaf Hering <olh@suse.de> > > drivers/serial/8250.c | 7 +++++++ > 1 files changed, 7 insertions(+) > > Index: linux-2.6.15-rc5-olh/drivers/serial/8250.c > =================================================================== > --- linux-2.6.15-rc5-olh.orig/drivers/serial/8250.c > +++ linux-2.6.15-rc5-olh/drivers/serial/8250.c > @@ -1154,6 +1154,13 @@ receive_chars(struct uart_8250_port *up, > */ > } > ch = serial_inp(up, UART_RX); > + > +#if defined(CONFIG_MAGIC_SYSRQ) && defined(CONFIG_SERIAL_CORE_CONSOLE)
If it is a POWER4-only problem, why isn't there a dependency on CONFIG_POWER4 over here? I don't like to have the ctrl-o sysrq stuff enabled on my regular PC if it only matters to some rare (in absolute numbers) system.
Erik
-- +-- Erik Mouw -- www.harddisk-recovery.com -- +31 70 370 12 90 -- | Lab address: Delftechpark 26, 2628 XH, Delft, The Netherlands - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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