Hi,
playing with patch-2.6.19-rc6-rt3 on an embedded TI OMAP
based ARM926 system I encountered two issues.
First, I got the system booting and even playing MP3 via NFS
using madplay on ALSA works :)
But after madplay stops, I got an Oops:
kernel BUG at kernel/rtmutex.c:672!
Unable to handle kernel NULL pointer dereference at virtual
address 00000000
pgd = c0004000
[00000000] *pgd=00000000
Internal error: Oops: 817 [#1]
PC is at __bug+0x44/0x58
LR is at rt_up+0x4c/0x6c
...
Any ideas what's wrong here? Note that I used recent OMAP
git and not OMAP mainline so I manually had to convert some
spinlock_t to raw_spinlock_t.
Second, I tried to compile cyclictest 0.11. Seems that for
me it isn't so easy as described on [1] "Get the latest
source tarball, untar into a directory of your choice and
run make in the source directory.":
~/cyclictest> make
arm-linux-gcc -Wall -O2 -lpthread -lrt cyclictest.c -o
cyclictest
cyclictest.c: In function 'timerthread':
cyclictest.c:153: error: 'SIGEV_THREAD_ID' undeclared (first
use in this function)
cyclictest.c:153: error: (Each undeclared identifier is
reported only once
cyclictest.c:153: error: for each function it appears in.)
cyclictest.c:155: error: 'union <anonymous>' has no member
named '_tid'
cyclictest.c: At top level:
cyclictest.c:318: error: 'CLOCK_MONOTONIC' undeclared here
(not in a function)
Looking into kernel headers, SIGEV_THREAD_ID and
CLOCK_MONOTONIC are defined by kernels include files, but
seems that they are not included here correctly. Defining
them manually in cyclictest.c then results in
cyclictest.c:158: error: 'union <anonymous>' has no member
named '_tid'
And here, I stopped because my _sigev_un in
include/bits/siginfo.h really contains no _tid:
struct
{
void (*_function) (sigval_t); /* Function to start. */
void *_attribute; /* Really pthread_attr_t. */
} _sigev_thread;
} _sigev_un;
I use a gcc 4.1.0 toolchain built with crosstool with
glibc-2.3.2:
~/cyclictest> arm-linux-gcc -v
Using built-in specs.
Target: arm-linux
Configured with:
/crossgcc/arm/arm_gcc_4_1_0/crosstool-0.42/build/arm-linux/gcc-4.1.0-glibc-2.3.2/gcc-4.1.0/configure
--target=arm-linux --host=i686-host_pc-linux-gnu
--prefix=/usr/arm/arm-linux
--with-headers=/usr/arm-linux/arm-linux/include
--with-local-prefix=/usr/arm-linux/arm-linux --disable-nls
--enable-threads=posix --enable-symvers=gnu
--enable-__cxa_atexit --enable-languages=c,c++
--enable-shared --enable-c99 --enable-long-long
Thread model: posix
gcc version 4.1.0
Any ideas here as well?
[1] http://rt.wiki.kernel.org/index.php/Cyclictest
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