Re: [OpenOCD-user] Altera Cyclone V Configuration

[<cob...@se...>]

Yes. I did use the jtagspi. However, the jtagspi is for configuring the 
flash. The documentation is suggesting a target type of testee.

documentation:

target create $_TARGETNAME testee -chain-position $_CHIPNAME.fpga
set _XILINX_USER1 0x02
flash bank $_FLASHNAME spi 0x0 0 0 0 \
$_TARGETNAME $_XILINX_USER1

These commands create both a target and a flash.
When I try to access the target directly(via mdw/mww), it tells me that 
memory commands are not supported. That is what I am referring to when I 
say the testee target doesn't support memory commands.

It's the first line I am referring to, which is the setup of the target. 
I have created an svf file to upload a bootstrap program to the FPGA. So, 
in a way the FPGA is no longer the target. It is a middle man so to speak.

The sequence is:

memory/jtag command --> Flash loader software on  FPGA --> ISSI flash 
memory
 
The ultimate target or final destination is the flash memory.

To rephrase what I said earlier:

I am ultimately trying to write a flash program to flash memory via an 
FPGA that has been programmed with the necessary code to handle this task.

Now, any flash commands in OpenOCD would need to send the commands to the 
FPGA app so to speak. OpenOCD would have to "know" about the FPGA 
middleware much like it knows information about other target types. At 
least this how it seems based on my current level of understanding. For 
instance, when you target a particular processor, it knows what it is 
going to be communicating with that processor and "speaks the right 
language."

My specific configuration is:

jtag newtap 5CGXFC5C6U19 tap -expected-id 0x02B020DD -irlen 10
target create fpga testee -chain-position 5CGXFC5C6U19.tap
flash bank issiflash jtagspi 0x0 0 0 0 fpga 0x02 10

Does this make better sense?

Coby




From:   Paul Fertser <fer...@gm...>
To:     cob...@se...
Cc:     ope...@li...
Date:   03/28/2018 11:40 PM
Subject:        Re: [OpenOCD-user] Altera Cyclone V Configuration



Hi,

On Wed, Mar 28, 2018 at 06:01:36PM -0700, cob...@se... wrote:
> The testee target type you suggested did work, but the target type 
doesn't
> support memory commands.

I suggested jtagspi, not testee :) Please check the official manual, I
think it has extensive info regarding jtagspi.

> The flash configuration you gave me appeared to configure at first, but 
then it
> failed later with an 'Unknown flash device (ID 0x00000000)' error. Could 
the
> reason for this be because I am talking to the flash through the FPGA 
software?

I think I haven't given you any specific configuration. If you're
talking about jtagspi, have you created and flashed a suitable
bitstream for the target FPGA?

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