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Thread: openCL example on yocto image on cyclone 5 SOC

  1. #1
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    Default openCL example on yocto image on cyclone 5 SOC

    I've been trying to run vector_add opencl exmaple to run on cyclone 5 SOC. It is perfectly working if I use default linux image given in Intel FPGA SDK for OpenCL. As default linux is compiled using gcc-linaro 4.7. I have compiled openCL example with gcc-linaro 4.7 and whole setup is perfectly working.
    Now I've setup yocto build environment for cyclone 5 SOC which is using gcc-linaro 5.2 and linux-altera-ltsi 4.1. I am using rootfs, zImage and dtb from yocto build and the opencl.rbf form default image. I have compiled vector_add example with gcc-linaro 5.2. I have also compiled opencl linux kernel module with gcc-linaro 5.2 and put it into /home/root directory as suggested by ug_aocl_c5soc_devkit_platform.pdf. I have used the same setup which I used with working setup. So there is no issue of misplacing file.

    Cyclone 5 SOC perfectly boots with this image. But when I try to install the aclsoc_drv.ko using init_opencl.sh, I got the execption as follows and board get hang.

    root@cyclone5:~# source ./init_opencl.sh
    [ 63.911143] INFO: rcu_sched self-detected stall on CPU
    [ 63.916285] 0: (1 GPs behind) idle=e6f/140000000000002/0 softirq=2567/2568 fqs=2092
    [ 63.924077] (t=2100 jiffies g=1184 c=1183 q=154)
    [ 63.928859] Task dump for CPU 0:
    [ 63.932073] insmod R running 0 865 839 0x00000002
    [ 63.938451] [<c0018968>] (unwind_backtrace) from [<c0013a6c>] (show_stack+0x20/0x24)
    [ 63.946174] [<c0013a6c>] (show_stack) from [<c004eb74>] (sched_show_task+0xb4/0x108)
    [ 63.953890] [<c004eb74>] (sched_show_task) from [<c0051c58>] (dump_cpu_task+0x48/0x50)
    [ 63.961781] [<c0051c58>] (dump_cpu_task) from [<c007226c>] (rcu_dump_cpu_stacks+0xa4/0xe4)
    [ 63.970015] [<c007226c>] (rcu_dump_cpu_stacks) from [<c0075738>] (rcu_check_callbacks+0x570/0x8ac)
    [ 63.978940] [<c0075738>] (rcu_check_callbacks) from [<c007a080>] (update_process_times+0x4c/0x74)
    [ 63.987782] [<c007a080>] (update_process_times) from [<c008b478>] (tick_sched_timer+0x78/0x268)
    [ 63.996445] [<c008b478>] (tick_sched_timer) from [<c007aeb0>] (__run_hrtimer+0x90/0x1bc)
    [ 64.004503] [<c007aeb0>] (__run_hrtimer) from [<c007b284>] (hrtimer_interrupt+0x140/0x31c)
    [ 64.012735] [<c007b284>] (hrtimer_interrupt) from [<c0017c34>] (twd_handler+0x40/0x50)
    [ 64.020628] [<c0017c34>] (twd_handler) from [<c006be3c>] (handle_percpu_devid_irq+0x90/0x124)
    [ 64.029119] [<c006be3c>] (handle_percpu_devid_irq) from [<c006785c>] (generic_handle_irq+0x3c/0x4c)
    [ 64.038128] [<c006785c>] (generic_handle_irq) from [<c0067b68>] (__handle_domain_irq+0x6c/0xc4)
    [ 64.046790] [<c0067b68>] (__handle_domain_irq) from [<c0009480>] (gic_handle_irq+0x34/0x6c)
    [ 64.055106] [<c0009480>] (gic_handle_irq) from [<c0014600>] (__irq_svc+0x40/0x54)
    [ 64.062553] Exception stack(0xce76fa78 to 0xce76fac0)


    Does anyone have idea what I am doing wrong? I am very new to this cyclone 5 SOC and opencl.

  2. #2
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    Default Re: openCL example on yocto image on cyclone 5 SOC

    I have had this exact same problem! I've been trying to get custom Linux working with OpenCL for a while now and it looks like I've taken a similar approach to you. Unfortunately I haven't got anything functional, but maybe together we can figure this thing out.

    I have noticed 3 consistent failure modes:

    1. System hangs on `insmod` (like you)
    2. I can insert the driver, but running the host program (eg. ./host) fails and gives `Unhandled fault: imprecise external abort`
    3. I can successfully run my host code, but there is a 1s delay before the kernel returns. (I believe I have only got kernel 4.3 with Yocto jethro to do this, but I would have to double check)

    Have you seen either of these other failure modes?

  3. #3
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    Default Re: openCL example on yocto image on cyclone 5 SOC

    I haven't noticed #2 & #3. May be I will get that when I will solve #1.
    I thought you've made it working. I was following your another thread where you made it.

    https://alterawiki.com/forum/showthr...54724&p=223118

  4. #4
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    Default Re: openCL example on yocto image on cyclone 5 SOC

    I've only got it working to a degree unfortunately, I can't seem to get past #3 above.

  5. #5
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    Default Re: openCL example on yocto image on cyclone 5 SOC

    What OS are you using? I've tried in Ubuntu 16.04, CentOS 6.3 and 6.8

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