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Where is the NEON register in CCS debug perspective?

Robert W
Mastermind 7100 points

Other Parts Discussed in Thread: AM3517

Hi,

Even I write some NEON code and it runs in debugger, I cannot see the NEON register contents. The compiler options are:

-mv7A8 --code_state=32 --float_support=VFPv3 --abi=eabi -me -O2 --opt_for_speed=5 --include_path="C:/ti/ccsv5/tools/compiler/arm_5.1.1/include" --include_path="C:/ti/AM335X_StarterWare_02_00_01_01/include" --include_path="C:/ti/AM335X_StarterWare_02_00_01_01/include/hw" --include_path="C:/ti/AM335X_StarterWare_02_00_01_01/include/armv7a/am335x" --include_path="C:/ti/AM335X_StarterWare_02_00_01_01/include/armv7a" --gcc --diag_warning=225 --display_error_number --diag_wrap=off --neon

The StarterWare library has also updated the respective options such as VFPv3, -mv7A8 etc.

From the screen shot, can you see what register group has NEON registers?

Thanks,

  • 0
    TI__Guru**** 393215 points

    Robert,

    This forum supports only Linux.

    For Starterware support please ask on the dedicated forum: https://e2e.ti.com/support/embedded/starterware/f/790

    For CCS support please ask on the dedicated forum: https://e2e.ti.com/support/development_tools/code_composer_studio/f/81

  • 0 in reply to Biser Gatchev-XID
    TI__Mastermind 26031 points

    Nice explanation of the Neon q registers here:

    http://processors.wiki.ti.com/index.php/Cortex_A8#What_does_a_Neon_assembly_instruction_look_like

    Attached (old CCSv5.  Can't remember if AM3517 or AM335x) screenshot shows at least the VFP d registers highlighted in yellow on CCSv5 after running a biquad in Linux.  They should show up in the CPU registers drop down window.  I think I have a screen shot of the dot product in above link somewhere.  Can also dig up the project in Linux.

  • 0 in reply to Joe G.
    Mastermind 7100 points

    Thanks for your reply. Comparing with your picture, there are too many differences between the two. I cannot set the 'Registers' window to yours, i.e. there is no 'd0' etc. registers in mine project. Second, I notice that in your 'Debug' Window, there is gdb icon, while there is no such in mine.

    I did have one asm function in NEON code. Even there is no NEON code, the NEON registers should still be there to display.

    I have tried for TI CGT compiler in CCS 6 under Linux. The NEON register is still missing.

    BTW, does your project use GCC toolchain or CGT? I don't know whether it matters or not.

  • 0 in reply to Robert W
    TI__Mastermind 26031 points

    Sorry, I did this too long ago but will try again next week on newer CCS and HW.

     

    >> Second, I notice that in your 'Debug' Window, there is gdb icon

    Good point.  From memory, I might have only been able to run CCS with gdb (over Ethernet) to see the Neon reigsters back then.   And definitely built/loaded from Linux.

     

    >>BTW, does your project use GCC toolchain or CGT? I don't know whether it matters or not.

    Definitely built with gcc back then especially to get Neon/VFP registers working. Though CGT might work now,  from memory Neon intrinsics did not work in CGT back then.  I'm sure pretty I never got Neon working on Starterware back then (i.e. setting up cache/Neon/VFP was easier in Linux) but this also might have changed recently with Staterware and SYS/BIOS usage.

    Just remembered, pretty sure there still is an option in CCS (with JTAG) under View->"Advanced Features" or something light that (same dialog box as GEL files) that allows you to turn Neon/VFP on/off with a checkbox.  Maybe that matters?

     

  • 0 in reply to Joe G.
    TI__Mastermind 26031 points

    Not sure how much this helps you, but at quick glance it looks like we did this on an AM3517 EVM using gdb:

    processors.wiki.ti.com/.../Sitara_Linux_SDK_CCS_GDB_Setup

    (And setting up with RSE helped: processors.wiki.ti.com/.../How_to_setup_Remote_System_Explorer_plug-in )

    CCSv6 should work the same (over Ethernet/Linux).  Sorry, haven't had a chance to see if we can do the same with JTAG over CCS (with Starterware or other non-Linux method). 

    >>Just remembered, pretty sure there still is an option in CCS (with JTAG) under View->"Advanced Features"

    Actually in Tools->ARM Advanced Features [Neon Enabled] but still did not see q or d registers.  

    Please see screenshot below that shows the d and q registers and dissassembly with gdb.

  • 0 in reply to Joe G.
    TI__Mastermind 26031 points
    Just FYI when I was on my Linux laptop for another issue, I noticed the Starterware does have a Neon project:
    processors.wiki.ti.com/.../StarterWare_02.00.01.01_User_Guide

    When I built and ran the gcc project on an AM335x EVM after connecting with JTAG, I saw VFP d registers being used in the disassembly (not using vfplib like with TI CGT). But still never saw the d or q registers in the screenshot above.