AWR2944: sbl_qspi, external code inject

zack ye

Part Number: AWR2944

What I want to do：

Now I have a running bootloader (sbl_qspi), When I download a hex file to specify empty location, for example 0x1021E000-0x10220000. then I send command to call code location int hex.(0x1021e018）you can see in picture)

problem:

. I find these instruction(0x1021e018) can't be executed. if I run to 0x1021E026, It should return to R14. but it continue to 0x1021E028.

I try to put these codes at 0x1021E000-0x10220000 directly, compiled these code in sbl_qspi and make sure same location have same instruction, these same instructions can be executed correctly

I use CCS to debug this function. I don't know why same instructions have different result. Any Idea?

The picture

9 months ago

0 Samhitha Bobba 9 months ago

TI__Genius 10590 points

Hi Zack,

Can you specify when are you loading the file onto the memory? Before loading the file, can you connect to the core and check the value of the program counter?

Regards,

Samhitha

0 zack ye 9 months ago in reply to Samhitha Bobba

Prodigy 20 points

Hi Samhitha Bobba, after start boot. I have a while(1) to receive can-fd message, when I receive the file send by can-fd, I will load it to memory. the value of PC is right.

And I know why it can't be execute, the root cause is after I copy this file to memory and problem run to this code, it not be updated to cache, I must use

CacheP function updated this memory . do you have any document explain this? In my opinion, When I run to this code, it should update the code in ram to cached automatic.

0 Samhitha Bobba 9 months ago in reply to zack ye

TI__Genius 10590 points

Hi Zack,

Can you please confirm what kind of data are you loading onto the memory? Is it some code?

Regards,

Samhitha

0 zack ye 9 months ago in reply to Samhitha Bobba

Prodigy 20 points

A .hex file loading to the memory. the problem is not about the code. I wonder why after I load the code and I run to this code(0x10200299)

the cpu don't move this code to cache from ram and run it. it run this code in cache directly. I want to know the process of CPU executing code, for example, when it load code to cached from rom and how big is it one time, do you have any doc or information about this.

0 Samhitha Bobba 9 months ago in reply to zack ye

TI__Genius 10590 points

Hi Zack,

You can refer to ARM documentation to understand Cache coherency. Here is the link for your reference: ARM Cortex-R Series Programmer's Guide.

You can also refer to (+) AWR2944: Under what circumstances should CacheP_wb, CacheP_inv, and CacheP_wbInv be used in the R5F core of AWR2944? - Sensors forum - Sensors - TI E2E support forums.

Regards,

Samhitha