Re: Fwd: Requested configuration data - Re: Is there support for the Tascam DM-4800 / IF-FW DM Version 2 or could you guide me to try making it?

[Takashi S. <o-t...@sa...>]

Hi,

On Sun, Apr 28, 2024 at 05:22:29PM +0200, Joerg M. Sigle wrote:
> > 1. The image of configuration ROM
> > ... 
> Please see the attachment.
 
Okay. I made a PR to systemd project according to the content of image.

https://github.com/systemd/systemd/pull/32542

When you put the entry in your system following to 'man hwdb' (e.g. under
/etc directory), restart udev daemon, and logout/login, the access
permission to '/dev/fw1' is configured to what we expect automatically,
independent of the installation of libffado2 rule. (requiring systemd v249
or later).

If you agree with CC0 for the copyright of image, I would like to push
it to my collection, Just for safe, Do you mind it?

https://github.com/takaswie/am-config-roms/

> > 2. General section information in Wavefront DiceII ASIC
> > ...
> > $ firewire-request /dev/fw1 read 0xffffe0000000 0x28
> 
> root@think3  So Apr 28  14:56:23  /usr/src/ffado/linux-firewire-utils-0.5.1
> # firewire-request /dev/fw1 read 0xffffe0000000 0x28
> result: 000: 00 00 00 0a 00 00 00 82 00 00 00 8c 00 00 00 8e ................
> result: 010: 00 00 01 1a 00 00 01 1a 00 00 00 00 00 00 00 00 ................
> result: 020: 00 00 00 00 00 00 00 00                         ........
 
Good. The general section consists of the following information:

000: 00 00 00 0a 00 00 00 82: global section    offset 0x28,  size 0x208
008: 00 00 00 8c 00 00 00 8e: tx stream section offset 0x230, size 0x238
010: 00 00 01 1a 00 00 01 1a: rx stream section offset 0x468, size 0x468
018: 00 00 00 00 00 00 00 00: extended status of sync is not supported.
020: 00 00 00 00 00 00 00 00: reserved fields.

You can retrieve the content of each section by read access to the
offset plus 0xffffe0000000 and the size. For example of tx stream
section:

$ firewire-request /dev/fw1 read 0xffffe0000230 0x238

The tx/rx sections tell software about the stream formats and
configurations.

Well, my concern is the spontaneous change of these two sections by
mixer settings of tx/rx channels. As I mentioned, your device has
two modes (16 channels and 32 channels) per each, at least according to
the manual. The description in the manual reminds me that these two
sections have a quirk which I do not expect for Dice devices.


Thanks

Takashi Sakamoto