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TMDS570LS31HDK: Getting start and end address of .cinit section.

Robin S
Prodigy 145 points
Part Number: TMDS570LS31HDK
Other Parts Discussed in Thread: HALCOGEN

Hello,

I am trying to generate a CRC on Flash memory using the SL_CRC_Calculate() function. However, I cannot find a way to access the origin or start address of the .cinit section in memory. I know the linker provides the symbols __TI_CINIT_Base and __TI_CINIT_Limit, but this does not cover the whole .cinit section as can be seen from the map file:

SECTION ALLOCATION MAP

 output                                  attributes/
section   page    origin      length       input sections
--------  ----  ----------  ----------   ----------------
.kernelTEXT 
*          0    00000020    00005604     
                  00000020    00002f04     os_tasks.obj (.kernelTEXT)
                  00002f24    000012dc     os_queue.obj (.kernelTEXT)
                  00004200    00000818     os_event_groups.obj (.kernelTEXT)
                  00004a18    000004b0     os_portasm.obj (.kernelTEXT)
                  00004ec8    000003e0     os_port.obj (.kernelTEXT)
                  000052a8    0000037c     os_heap.obj (.kernelTEXT)

.cinit     0    00005628    000000e8     
                  00005628    0000009d     (.cinit..data.load) [load image, compression = lzss]
                  000056c5    00000003     --HOLE-- [fill = 0]
                  000056c8    0000000c     (__TI_handler_table)
                  000056d4    00000009     (.cinit..kernelBSS.load) [load image, compression = lzss]
                  000056dd    00000003     --HOLE-- [fill = 0]
                  000056e0    00000008     (.cinit..bss.load) [load image, compression = zero_init]
                  000056e8    00000008     (.cinit..kernelHEAP.load) [load image, compression = zero_init]
                  000056f0    00000020     (__TI_cinit_table)

...

GLOBAL SYMBOLS: SORTED BY Symbol Address 

address   name                                                                             
-------   ----                                                                             
00000000  resetEntry                                                                       
....                                         
0000560c  vPortInitialiseBlocks                                                            
00005628  __TI_static_base__                                                               
000056c8  __TI_Handler_Table_Base                                                          
000056d4  __TI_Handler_Table_Limit                                                         
000056f0  __TI_CINIT_Base                                                                  
00005710  __TI_CINIT_Limit

Notably, there's __TI_static_base__ and __TI_Handler_Table_Base in between the end of the previous section (ends @ 0x5628) and the __TI_CINIT_Base (0x56f0).

I wasn't able to find any documentation on __TI_static_base__, and couldn't find any confirmation that the Handler table will always appear before the Cinit table. Is there a way to capture the whole of the .cinit section? 
Thank you!

  • 0
    TI__Guru 71411 points

    Hi Robin,

    We started working on your issue and will provide an update soon.

    --

    Thanks & regards,
    Jagadish.

  • 0 in reply to jagadish gundavarapu
    TI__Guru**** 197446 points

    The .cinit section contains the autoinit table for C/C++ programs. The  __TI_CINIT_Base and __TI_CINIT_Limit point to the start and end of this table.

    But the Linker CRC_table has the CRC value of .the whole .cinit section (start addr = 0x5628, and size=0xe8) 

  • 0 in reply to QJ Wang
    Prodigy 145 points

    Hi QJ.

    I should've clarified, I need symbols that point to the start and end of this .cinit section that I can reference in C code. The __TI_CINIT_Base and __TI_CINIT_Limit symbols only provide coverage of the autoinit table, but I need to be sure I can cover the .cinit..data.load range as well. Ideally I'd have a symbol pointing to the start address 0x5628 and the end address 0x5710.

    Because I am using halcogen, I cannot insert symbols on my own into the section, as the code will be overwritten every time we regenerate halcogen code during development.

  • 0 in reply to Robin S
    TI__Guru**** 197446 points
    Robin S said:
    Because I am using halcogen, I cannot insert symbols on my own into the section, as the code will be overwritten every time we regenerate halcogen code during development.

    You can insert your own code inside the predefined /* USER CODE BEGIN */, otherwise your code will disappear after you regenerate HalCoGen code.

    Robin S said:
    I'd have a symbol pointing to the start address 0x5628 and the end address 0x5710.

    I don't know if there is any symbol pointing to the starting address. 

     __TI_CINIT_Limit  ponts to the end address.

  • 0 in reply to QJ Wang
    Prodigy 145 points

    Hi QJ,

    Thanks for confirming the starting address behaviour. Do you know what __TI_static_base__ was used for? It seems to be generated at the start address of the .cinit section (0x5628) but I can't find any documentation confirming that this will always be true.

  • +1 in reply to Robin S
    TI__Guru**** 197446 points

    .cinit is for the initialized global and static variables. __TI_static_base__ may not point to the starting address of .cinit table. 

    I could not find the definition of __TI_static_base__.

  • 0 in reply to QJ Wang
    Prodigy 145 points

    Alright, thanks for confirming that QJ.

    I'll find a workaround then.