Tool/software: TI C/C++ Compiler
Hello,
We have a product based on the dual core OMAP L138 System-on-Chip (SoC) part from Texas Instruments 10 years ago. Now we found a problem seems related to the compiler and link.
We have some functions using switch…case, in the link command file,
It defined the memory map:
/* Memory map */
MEMORY
{
VECTORS o = 000800000h l = 00000500h
PCONSTACK: o = 000800500h l = 00002000h
RAM: o = 000802500h l = 0003db00h
BBRAM: o = PSM_BBRAM_ADDRESS l = PSM_BBRAM_SIZE
FLASH: o = PSM_FLASH_ADDRESS l = PSM_FLASH_SIZE
BMEM: o = PSM_DSP_RAM_ADDRESS l = PSM_DSP_RAM_SIZE
}
And .fastcode, .fastdata, they should be in RAM, but the space is not enough, so some switch will stay at BMEM
.switch: >> RAM | BMEM
Then it defined the BMEM other sections:
GROUP
{
sect_im: {}
im_hisr: {}
.data: {}
sect_str:{}
sect_att:{}
………………….
.sysmem: palign(8)
{
_HEAP_START = . ;
*(.sysmem)
}
.sysmemend: palign(8)
{
_HEAP_END = . ;
}
} > BMEM
But when we look at the generated map file, we can find that most part of the switch is in RAM, some part of the switch is behind .sysmemend
.switch.1 (RAM)
* 0 0083f5a0 00000a5c
0083f5a0 0000013c courier.lib : route.obj (.switch:_route_InterpretCourierCommand)
0083f6dc 000000fc uix.obj (.switch:_uiX_MultiPageFaultDisplay)
0083f7d8 000000a4 courier.lib : cr_snprintf.obj (.switch:_courier_snprintf)
.sysmem 0 c2b24b68 0000c000
c2b24b68 00000008 rts6740.lib : memory.obj (.sysmem) [fill = 00000000]
c2b24b70 0000bff8 --HOLE-- [fill = 00000000]
.sysmemend
* 0 c2b30b68 00000000 UNINITIALIZED
.switch.2 (BMEM)
* 0 c2b30b80 000000e0
c2b30b80 00000010 curmfnx.obj (.switch:_curmf_SETTING_vis_Range_OR)
c2b30b90 00000010 curmfnx.obj (.switch:_curmf_SETTING_vis_Range_OR_AND)
c2b30ba0 00000010 modbus.lib : event.obj (.switch:_modbus_BuildTxEvent)
c2b30bb0 00000010 smmx.obj (.switch:_msfX_DownloadComplete)
During the test, the area after c2b30b80 is inaccessible! I did some change to put all switch in BMEM but before sysmem and sysmemend. All functions work fine!
But since the switch section has to be divided in to two parts, how to set only one part in BMEM before the sysmem?
I am not very clear about the compiler, link and the meaning of sysmem and sysmemend. Can you help to advise please?
Many thanks
Linda
