I support linux on x86 hardware, but on my old Sun blade 100, the only open
source OS which consistently installs and runs properly is openbsd for
sparc. I must have tried 100 times to get linux to work but it does not
work with the rage xl video board and i am not a patient guy.; openbsd
does.
On Fri, Feb 22, 2013 at 3:42 PM, Patrick Baggett
baggett.patr...@gmail.comwrote:
On Fri, Feb 22, 2013 at 8:15 AM, Mathieu Desnoyers
mathieu.desnoy...@efficios.com wrote:
Hi,
I notice the following build failure here
https://buildd.debian.org/status/package.php?p=liburcu
Tail of log for liburcu on sparc:
urcu/static/wfqueue.h:84:2: warning: implicit declaration of function
'CMM_STORE_SHARED' [-Wimplicit-function-declaration]
urcu/static/wfqueue.h: In function '___cds_wfq_node_sync_next':
urcu/static/wfqueue.h:99:2: warning: implicit declaration of function
'CMM_LOAD_SHARED' [-Wimplicit-function-declaration]
urcu/static/wfqueue.h:99:15: warning: assignment makes pointer from
integer without a cast [enabled by default]
urcu/static/wfqueue.h:104:4: warning: implicit declaration of function
'caa_cpu_relax' [-Wimplicit-function-declaration]
urcu/static/wfqueue.h: In function '___cds_wfq_dequeue_blocking':
urcu/static/wfqueue.h:126:55: warning: comparison between pointer and
integer [enabled by default]
make[3]: *** [wfqueue.lo] Error 1
make[3]: Leaving directory
`/build/buildd-liburcu_0.7.6-1-sparc-GySyug/liburcu-0.7.6'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory
`/build/buildd-liburcu_0.7.6-1-sparc-GySyug/liburcu-0.7.6'
make[1]: *** [all] Error 2
make[1]: Leaving directory
`/build/buildd-liburcu_0.7.6-1-sparc-GySyug/liburcu-0.7.6'
dh_auto_build: make -j1 returned exit code 2
make: *** [build-arch] Error 2
One main question I have: what sparc architectures are supported by
Debian's sparc architecture ? Userspace RCU only supports Sparcv9 and
onward, because it requires some atomic instructions.
Debian definitely only supports[1] SPARCv9 compatible CPUs (sun4u, sun4v).
I've heard that Linux on 32-bit SPARC (i.e. sparc = v8) is shoddy now, but
I certainly haven't tried it.
[1] http://www.debian.org/ports/sparc/
As documented in the urcu README file, building a package that includes
sparcv9 isntructions for 32-bit sparc can be done with:
CFLAGS=-m32 -Wa,-Av9a -g -O2 ./configure
v9a includes VIS instruction set, which is an extension of SPARCv9. I
think only some early Fujitsu SPARC CPUs (pre 2000) are missing it -- the
original UltraSPARC from Sun does include it. Probably safe to turn on, but
technically extends requirements to use the program.
But if Debian sparc needs to support pre-v9 sparcs, then I guess it
would not be appropriate to use v9 instructions for urcu sparc build.
Thoughts ?
Thanks,
Mathieu
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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