how to modify the cmd file to use multi memory sectors for .test section?

Di Jiao

Hello,

I am learning the F28377D and have trouble to use the linker cmd file.

I used the 2837x_RAM_lnk_cpu1.cmd in my program and I got the error that program will not fit into available memory. And I tried to modify the linker cmd file to expand the memory sectors for .text section.

1.Errors when using the OR operation

.text            : >>RAMGS2 | RAMGS3 |  RAMGS4 | RAMGS5 | RAMGS6 | RAMGS7 | RAMGS8 | RAMGS9 | RAMGS10 | RAMGS11 | RAMGS12 | RAMGS13 | RAMGS14 | RAMGS15,   PAGE = 1

Firstly I modified the cmd file as above and that made no sense.

I think the cmd above means that the .text section can use sectors from RAMGS2 to RAMGS15 and is there something wrong?

2.Problems solved with sectors combined

   RAMGS0      : origin = 0x00C000, length = 0x001000
   RAMGS1      : origin = 0x00D000, length = 0x001000
   RAMGS2      : origin = 0x00E000, length = 0x00E000


   .text            : > RAMGS2,   PAGE = 1

Then I tried to combine the sectors from RAMGS2 to RAMGS15 together as a new and large RAMGS2 .

And the problem was solved.

What's the differences between the 2 ways above?

3.New puzzle using the OR operation

I modified the cmd file again.

   RAMGS0      : origin = 0x00C000, length = 0x001000
   RAMGS1      : origin = 0x00D000, length = 0x001000
   RAMGS2      : origin = 0x00E000, length = 0x001000
   RAMGS3      : origin = 0x00F000, length = 0x001000
   RAMGS4      : origin = 0x010000, length = 0x00C000

   .text            : >> RAMGS1 | RAMGS2 | RAMGS3 | RAMGS4,   PAGE = 1

I combined the sectors from RAMGS4 to RAMGS15 together as a new and large RAMGS4 .

The project was built successfully.

However, when I used the Memory Allocation to view the memory I found someting strange: The RAMGS1 and RAMGS4 were used while the RAMGS2 and RAMGS3 were unused.

I do not understand why.

Looking forward to your reply.

Best regards,

-Di

over 9 years ago

0 Disona over 9 years ago

Genius 3050 points

Hello

1) Yes, that's correct. (refering to SPRU 513F 8.5.4.7)

I've just tested this on my project. ".text" was placed into FLASHCD. Then, i splitted FLASHCD into FLASHC and FLASHD - section didn't fit. Then i used "OR" operator as in your example - everything's ok. Can we have a look at full cmd file?

2) Difference between 1) and 2), as far a i know, is in section splitting. The first way can split your ".text" section. It allows to put a section into different memory blocks. That memory blocks can have gaps between them. The second way keeps a section unsplitted, but requires to combine some memory blocks into 1. It's not always possible, but prefer the second way =)

3) Well, maybe your project had enough space in GS1 and GS4 rams and it didn't require more space? Anyway, it would be interecsting to have full *.cmd file and .*map file. But as atachments, not inserted in post ;)