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how to build an arm juno r1 application from an linux platform

The toolchain of my linux computer is x86_64-redhat-linux.

On Juno board, I run the prebuilt image https://releases.linaro.org/openembedded/juno-lsk/15.09/lt-vexpress64-openembedded_minimal-armv8-gcc-4.9_20150912-729.img.gz

1. I searched online, many developers said the toolchain of arm juno r1 board is gcc-arm-none-eabi. I downloaded the package of this toolchain, and set path to this toolchain directory in my linux computer. I can compile a simple hellowold application with linux machine, and copy it to juno board, it can not run on Juno board.  When run it, it shows

root@genericarmv8:/mnt# ./hello

hello[999]: unhandled level 3 translation fault (11) at 0x0007fff8, esr 0x92000047

pgd = ffffffc07a00a000

[0007fff8] *pgd=00000000fabda003, *pud=00000000fabda003, *pmd=00000000fa0b4003, *pte=0000000000000000

CPU: 1 PID: 999 Comm: hello Not tainted 3.19.0+ #13

Hardware name: ARM Juno development board (r1) (DT)

task: ffffffc07aa66300 ti: ffffffc07a0cc000 task.ti: ffffffc07a0cc000

PC is at 0x82c8

LR is at 0x819c

pc : [<00000000000082c8>] lr : [<000000000000819c>] pstate: 60000010

sp : 0000000000080000

x12: 0000000000000000

x11: 0000000000000000 x10: 0000000000070000

x9 : 0000000000000000 x8 : 0000000000000000

x7 : 0000000000000000 x6 : 0000000000000000

x5 : 0000000000000000 x4 : 0000000000000000

x3 : 0000000000080000 x2 : 0000000000000058

x1 : 0000000000000000 x0 : 00000000000139a4

Segmentation fault

2. I downloaded Juno pre built full image https://releases.linaro.org/openembedded/juno-lsk/15.09/linaro-image-lamp-genericarmv8-20150921-770.rootfs.tar.gz

In user local, I can see this toolchain is aarch64-oe-linux-gcc, I copied this one to linux computer, and set the path, I cannot even compile helloworld application with this toolchain, it says  Exec format error, wrong architecture

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