[OpenOCD-user] Cortex R4-F support question

[plenkow <pl...@on...>]

Hi!
 
 
I am using openocd version 0.8.0 with JTAG interface based on FT232H.
 
My target is a custom SoC with Cortex R4-F core.
 
I am able to successfully access core through DAP/APB, but accessing to memory through CPU does not work well:
 
 
memory content is following:
 
0x05000000: 0x12345678
0x05000004: 0xdeadbeef
 
First access at 0x05000000 returns proper value:
 
mdw 0x05000000
 
 
0x12345678
 
 
but next always returns value form address 0x05000000 + 4
 
mdw 0x05000000
 
 
0xdeadbeef
 
 
 
Tracing the logs I found the source for used function cortex_a8_read_apb_ab_memory().
 
Reading Cortex R4-F TRM I found that implementation of this function is different than example 11-25 from TRM.
 
In example the last read word is read using different way, by reading DCC (step 10).
 
 
 
My question are:
 
Iis it a bug or just some trick?
 
Does anyone test this code on Cortex R-4F?
 
 
Second problem which I see is lack of 16 bit accesses.
 
In my case it generates a problems during Flash access using CFI.
Each access is made by 32 bit access which causes two 16 bit accesses to Flash breaking CFI sequence during program/erase.
 
 
 
Br,
 
Paweł Lenkow