optimization levels in genode

Stefan Kalkowski stefan.kalkowski at genode-labs.com
Wed Nov 14 09:26:37 CET 2018

On Tue, Nov 13, 2018 at 05:22:30PM +0800, lzSun wrote:
> Hello,Stefan
> Thanks for your effort! I have followed your advice to check to genode 18.08. I used the patch  you provided to me:
> https://github.com/skalk/genode/tree/imx53-hf-neon
> At first, I just build the whole project as before. But there's an error at building stage:
> can't read "cc_arch": no such variable
> while executing
> "exec [cross_dev_prefix]gcc -print-libgcc-file-name {*}$cc_arch"
>     (procedure "build_core" line 8)
>     invoked from within
> Then, I add the "cc_arch" to the file:  ./tool/run/run,  like this:
>  set asm_src [generate_boot_modules_asm [run_dir]/genode $modules]
> + set cc_arch "-mfloat-abi=hard -mfpu=neon"
> # determine the libgcc
> set libgcc [exec [cross_dev_prefix]gcc -print-libgcc-file-name {*}$cc_arch]
> After this, I can build the whole project successfully and measure the performance gain on the i.mx53 qsb board. However, there's still a problem. When my program have done and return  to normal world, the system seems stuck. From the serial port, I can only see the linux's cursor blinking but I couldn't input any command.The serial port's  output message like this:
> [init -> tz_vmm] task finished in 14588ms
> / #  
>  There are no errors which just like a command have executed normally. Do you have any idea about this? Thank you very much.

Just out of curiousity, are you still using the tz_vmm.run script? And
if so, did you changed it to do: "run_genode_until forever", or does
it still use "run_genode_until <some_condition> <timeout>"?


> ------------------
> Best wishes

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Stefan Kalkowski
Genode labs

https://github.com.skalk | https://genode.org

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