Re: [Openocd-development] ETM/ETB support

[Vincent P. <vin...@m4...>]

Hi Dominic,

> I've just committed my current working tree to the repository 
[...]
> I've tested the ETM support using several different trace captures
[...]

Once again, thanks for these features.

I've done the first tests with this code, I got the following low level 
issue :

using Amontec JtagKey-tiny hardware and the "proprietary" libd2xx,
"etm dump" always fails  when doing etb_read_ram().
The JTAG write access fails and I got the following message :
Error:   ft2232.c:174 ft2232_write(): FT_Write returned: 10
Error:   ft2232.c:356 ft2232_send_and_recv(): couldn't write MPSSE commands to 
FT2232

I think it is probably due to its huge size.
 (tested with 4096 frames = 69632bits and 1023 frames = 17391 bits)
As a workaround, I just move the jtag_execute_queue() inside the frame loop of  
etb_read_ram() to get plenty of 17bits accesses and it works well.
I don't know if you are aware of this issue or if it worths investiguating it 
further on my side to find a real fix on ftdi driver side.

Else with the workaround, all my simple tests pass ! 
(as recommended tested only in 16bits so far)

-- 
Vincent