Your altera arria V got an ARMv7 CPU without vfp floating point unit,
most ARMv7 hardware that IcedTea is tested against got a vfp floating
point unit thus your CPU is quite unique.
The icedtea sourcecode have been tested on a wide range of ARM CPU
variants from single core armv4 to the latest multicore armv7 chips
your CPU should be supported as long as you use a correctly configured
cross-compile tool-chain.
The icedtea sourcecode looks for the __ARM_PCS_VFP gcc builtin define to
determine if it should use VFP instructions or not.
http://icedtea.classpath.org/hg/icedtea7-forest/hotspot/file/5c40e2190b6e/src/cpu/zero/vm/cppInterpreter_arm.S#l375
Please check your cross compile gcc builtin defines by running:
echo "" | arm-linux-gnueabi-gcc -dM -E - | grep -i "vfp_fp\|pcs\|soft"
Make sure that the cross compiler you use do not have VFP enabled by
default.
Cheers
Xerxes
Den 2014-11-21 14:36, Manjunatha Srinivasan skrev:
Hi
I am new to Java and I need to port java (openjdk7) for my ARM board
altera arria V (armv7) development kit. Here are steps i followed:
1. Checked out poky repo into dylan branch from git (I need to port
on poky dylan only)
2. Checked out meta-java repo into master branch from github and add
as layer at bblyaer.conf.
3. Then, did MACHINE changes for alter and added below one at local.conf:
PREFERRED_VERSION_openjdk-7-jre = "25b30-2.3.12"
PREFERRED_VERSION_icedtea7-native = "2.1.3"
#Sometimes the following is needed:
PREFERRED_PROVIDER_openjdk-7-jre = "openjdk-7-jre"
4. Generated the root filesystem image and booted it.
From target, executed "java" fails by throwing error as "Illegal
instruction" (SIGILL)
My linux kernel (3.10) is disabled for floating point neon. If this is
enabled java error thrown as "Segmentation fault"(SIGSEGV).
Here is sample log:
root@10:~# cat /proc/cpuinfo
processor : 0
model name : ARMv7 Processor rev 0 (v7l)
BogoMIPS : 1836.64
Features : swp half thumb fastmult edsp thumbee tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x3
CPU part : 0xc09
CPU revision : 0
processor : 1
model name : ARMv7 Processor rev 0 (v7l)
BogoMIPS : 1843.20
Features : swp half thumb fastmult edsp thumbee tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x3
CPU part : 0xc09
CPU revision : 0
Hardware : Altera SOCFPGA
Revision : 0000
Serial : 0000000000000000
root@10:~# java
Illegal instruction
Please help me out for porting procedure for java on ARM altera. TIA.
Regards
Manjunatha Srinivasan N
