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How to get cpu id?

fy z_star79303
Prodigy 150 points

Hi,

    Now,i have some question need your help,i'am using DM365 and DM368 to do DVR development.

    I want to through cpu id to distinguish between DM365 and DM368

    Who can tell me how to get the cpu id?

  • 0 in reply to Prakash PM
    Prodigy 150 points

    Thanks for your reply,

          Before my post, I have read these changes,but i couldn't understand how to use is.

          Can you paste some code to explain it.

          Call cpu_is_davinci_dm368() or cpu_is_davinci_dm365() can judge the cpu is DM365 or DM368?

     

    Best regards,

     

  • 0 in reply to fy z_star79303
    TI__Intellectual 1275 points

    Please include mach/cputype.h and use cpu_is_davinci_xxxx macro. You can grep for cpu_is_davinci_dm365() macros in drivers folder.

    Thanks,

    Prakash

  • 0 in reply to Prakash PM
    Genius 3510 points

    Ok, I can simple get cpu id in driver via cpu_is_davinci_dm365() macros.
    How can I get cpu id in user-space, parse /proc/cpuinfo is not very good way?
    Thank you.

  • 0 in reply to Kirill Brilliantov
    Intellectual 410 points

    Kirill Brilliantov said:
    parse /proc/cpuinfo is not very good way?

    It's not that hard:

    1. open file /proc/cpuinfo - if cannot, return fail

    2. read line-by-line

    eg.

    Processor       : ARM926EJ-S rev 5 (v5l)
    BogoMIPS        : 240.84
    Features        : swp half thumb fastmult edsp java
    CPU implementer : 0x41
    CPU architecture: 5TEJ
    CPU variant     : 0x0
    CPU part        : 0x926
    CPU revision    : 5

    3 for each line, check using strstr() whether required string is present from:

    CPU implementer
    CPU architecture
    CPU variant
    CPU part
    CPU revision

    or whichever are the values you require

    4 when you detect a string you want, parse it using sscanf(), eg

    match_length = -1;

    match_count = sscanf(linebuf, "CPU part        : 0x%x%n", &partnum, &match_length);

    // using %n match_length gets set ensures we have read all the field

    if (match_count == 1 && match_length > 0) {

    // found valid CPU part number ...

    }

  • 0 in reply to Mike Whittaker
    Genius 3510 points

    Hello, Mike!

    Parse /proc/cpuinfo is not hard, it isn't reliable.

    I or who or other can edit MACHINE_START macro in kernel and result becomes not predictable.

    Or may be your can describe all line in /proc/cpuinfo for all processors, e.g. how to change Processor, CPU implementer, CPU variant, CPU part and CPU revision for DM355, DM365 and DM368?

  • 0 in reply to Kirill Brilliantov
    Intellectual 410 points

    Otherwise, read the ARM CPU id register:

    http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0395b/CIHCAGHH.html

    and the TMS320C64x CSR register - is there a way to do this from the ARM ?

    SInce there are two CPUs, there might be a case for saying that Linux should report the other (TMS) CPU as well - but it's not running Linux so I suppose not.