[hylo]

Originally Posted by zxczxc

Congratulations on getting your keyboard working, that sounded a bit difficult!

Thanks I hope this helps many.

Originally Posted by NiLuJe

As @knc1 mentioned, examining the symbol table of your resulting binary should be enough to make sure you're not hitting ABI issues.

I'm personally a fan of readelf for that job, which I find more user-friendly than nm .

Yes, readout from readelf was much more friendly for me, too. Moreover, I figured out later that '-D' option is needed for nm to print out dynamic symbol table when I'm not accessible to this toolchain. So, here is my binary's dynamic symbol table from readelf.

    Symbol table '.dynsym' contains 31 entries:
    Num:    Value  Size Type    Bind   Vis      Ndx Name
    0: 00000000     0 NOTYPE  LOCAL  DEFAULT  UND
    1: 00000000     0 NOTYPE  WEAK   DEFAULT  UND _ITM_deregisterTMCloneTab
    2: 00000000     0 NOTYPE  WEAK   DEFAULT  UND __gmon_start__
    3: 00000000     0 NOTYPE  WEAK   DEFAULT  UND _Jv_RegisterClasses
    4: 00000000     0 NOTYPE  WEAK   DEFAULT  UND _ITM_registerTMCloneTable
    5: 00021ae0     0 NOTYPE  GLOBAL DEFAULT   23 _bss_end__
    6: 00000000     0 FUNC    GLOBAL DEFAULT  UND XGetWindowAttributes
    7: 000116ec     0 FUNC    GLOBAL DEFAULT   13 _fini
    8: 00021ad4     0 NOTYPE  GLOBAL DEFAULT   23 __bss_start__
    9: 000106e4     0 FUNC    GLOBAL DEFAULT   10 _init
    10: 00021ad4     0 NOTYPE  GLOBAL DEFAULT   23 __bss_start
    11: 00000000     0 FUNC    GLOBAL DEFAULT  UND XDisplayKeycodes
12: 00000000     0 FUNC    GLOBAL DEFAULT  UND abort@GLIBC_2.4 (2)
    13: 00021ae0     0 NOTYPE  GLOBAL DEFAULT   23 _end
    14: 00021ae0     0 NOTYPE  GLOBAL DEFAULT   23 __end__
    15: 00000000     0 FUNC    GLOBAL DEFAULT  UND XSelectInput
    16: 00000000     0 FUNC    GLOBAL DEFAULT  UND XFree
17: 00000000     0 FUNC    GLOBAL DEFAULT  UND __libc_start_main@GLIBC_2.4 (2)
    18: 00021ad4     0 NOTYPE  GLOBAL DEFAULT   22 _edata
19: 00000000     0 FUNC    GLOBAL DEFAULT  UND usleep@GLIBC_2.4 (2)
    20: 00000000     0 FUNC    GLOBAL DEFAULT  UND XOpenDisplay
    21: 00000000     0 FUNC    GLOBAL DEFAULT  UND XCheckWindowEvent
    22: 00000000     0 FUNC    GLOBAL DEFAULT  UND XSendEvent
23: 00000000     0 FUNC    GLOBAL DEFAULT  UND puts@GLIBC_2.4 (2)
    24: 00021ae0     0 NOTYPE  GLOBAL DEFAULT   23 __bss_end__
    25: 00000000     0 FUNC    GLOBAL DEFAULT  UND XChangeKeyboardMapping
    26: 00000000     0 FUNC    GLOBAL DEFAULT  UND XFetchName
27: 00000000     0 FUNC    GLOBAL DEFAULT  UND printf@GLIBC_2.4 (2)
    28: 00000000     0 FUNC    GLOBAL DEFAULT  UND XLookupKeysym
    29: 00000000     0 FUNC    GLOBAL DEFAULT  UND XGetInputFocus
30: 00000000     0 FUNC    GLOBAL DEFAULT  UND raise@GLIBC_2.4 (2)

It seems that GLIBC 2.4 is the only library that version checking is needed. And it's much lower than 2.12 or 2.19. So, I carefully assume that at least this binary would be fine with the past firmware versions barring the system conf files I modified.

Thank you!