I tried to use the RTC callback timer with my 2.4.12 kernel.
Patching the kernel went fine, but then ALSA wouldn't compile the
snd-rtctimer.o module, although configure said:
| checking for RTC callback support in kernel ... "yes"
A glance at alsa-kernel/core/Makefile shows that both CONFIG_RTC and
CONFIG_SND_RTCTIMER need to be defined:
ifeq ($(subst m,y,$(CONFIG_RTC)),y)
obj-$(CONFIG_SND_RTCTIMER) += snd-timer.o
obj-$(CONFIG_SND_RTCTIMER) += snd-rtctimer.o
endif
... but neither appears in alsa-driver/Makefile.conf, apparently
because configure thinks it should define CONFIG_SND_RTC instead:
alsa-driver/configure.in:
...
rtcsup="0"
...
AC_MSG_RESULT("yes");rtcsup="m",
AC_MSG_RESULT("no");rtcsup="n",
AC_MSG_RESULT("unknown");rtcsup="n"
...
CONFIG_SND_RTC=$rtcsup
AC_SUBST(CONFIG_SND_RTC)
if test "$CONFIG_SND_RTC" = "1"; then
AC_DEFINE(CONFIG_SND_RTC)
fi
Additionally, it's unclear whether the value of CONFIG_SND_RTC should
be 0/1 or n/m.
Sorry, no patch because I'm lacking the autoconf knowledge for this.
(I got it to compile (and run) by hacking the makefile, but I won't
submit _this_ change. :-)
Clemens
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