* drivers/char/hvc_* and /Documentation/powerpc/hvcs.txt
@ 2008-01-25 22:39 Timur Tabi
2008-01-26 1:04 ` Olof Johansson
0 siblings, 1 reply; 3+ messages in thread
From: Timur Tabi @ 2008-01-25 22:39 UTC (permalink / raw)
To: linuxppc-dev
Hi,
I'm working on a console driver for the Freescale hypervisor. I notice a bunch
of hvc_* files in the drivers/char directory. I also noticed
/Documentation/powerpc/hvcs.txt.
My guess is that hvcs.txt talks about drivers/char/hvcs.c, which is a console
driver specific to some IBM hypervisor. The hvc_*.c files are based on that
code but they're more generic and allow people to write console drivers for
other hypervisors easliy. Am I right?
If so, does this mean that I can take hvc_beat.c, modify it to make Freescale
hypervisor calls instead, and presto, I'm done?
--
Timur Tabi
Linux kernel developer at Freescale
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: drivers/char/hvc_* and /Documentation/powerpc/hvcs.txt
2008-01-25 22:39 drivers/char/hvc_* and /Documentation/powerpc/hvcs.txt Timur Tabi
@ 2008-01-26 1:04 ` Olof Johansson
2008-02-06 23:16 ` Timur Tabi
0 siblings, 1 reply; 3+ messages in thread
From: Olof Johansson @ 2008-01-26 1:04 UTC (permalink / raw)
To: Timur Tabi; +Cc: linuxppc-dev
On Fri, Jan 25, 2008 at 04:39:27PM -0600, Timur Tabi wrote:
> Hi,
>
> I'm working on a console driver for the Freescale hypervisor. I notice a bunch
> of hvc_* files in the drivers/char directory. I also noticed
> /Documentation/powerpc/hvcs.txt.
>
> My guess is that hvcs.txt talks about drivers/char/hvcs.c, which is a console
> driver specific to some IBM hypervisor. The hvc_*.c files are based on that
> code but they're more generic and allow people to write console drivers for
> other hypervisors easliy. Am I right?
Hvcs is the server-side driver in some environments. I.e. a hvc console
connects through the hypervisor to a hvcs in another partition.
> If so, does this mean that I can take hvc_beat.c, modify it to make Freescale
> hypervisor calls instead, and presto, I'm done?
Yep, pretty much. It's real easy to write a new backend to hvc, I've got
a couple for various bringup environments here as well.
-Olof
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: drivers/char/hvc_* and /Documentation/powerpc/hvcs.txt
2008-01-26 1:04 ` Olof Johansson
@ 2008-02-06 23:16 ` Timur Tabi
0 siblings, 0 replies; 3+ messages in thread
From: Timur Tabi @ 2008-02-06 23:16 UTC (permalink / raw)
To: Olof Johansson; +Cc: linuxppc-dev
Olof Johansson wrote:
> Yep, pretty much. It's real easy to write a new backend to hvc, I've got
> a couple for various bringup environments here as well.
Could you tell me which kernel options I need to set/unset in order to get my
driver to be called? My driver loads and initializes, but its put_char function
is never called. Trying to debug to the console subsystem is making me dizzy.
--
Timur Tabi
Linux kernel developer at Freescale
^ permalink raw reply [flat|nested] 3+ messages in thread
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2008-01-25 22:39 drivers/char/hvc_* and /Documentation/powerpc/hvcs.txt Timur Tabi
2008-01-26 1:04 ` Olof Johansson
2008-02-06 23:16 ` Timur Tabi
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