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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43bd42c588dsm26580635e9.21.2025.03.05.11.56.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Mar 2025 11:56:02 -0800 (PST) Date: Wed, 5 Mar 2025 19:56:01 +0000 From: David Laight To: Johan Hovold Cc: Boon Khai Ng , Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Tien Sung Ang , Tien Sung Ang , Boon Khai Ng Subject: Re: [PATCH v1] USB: serial: ftdi_sio: add support for Altera USB Blaster 3 Message-ID: <20250305195601.1dc6a1f6@pumpkin> In-Reply-To: References: <20250203084822.18356-1-boon.khai.ng@intel.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Wed, 5 Mar 2025 15:24:53 +0100 Johan Hovold wrote: > On Mon, Feb 03, 2025 at 04:48:22PM +0800, Boon Khai Ng wrote: > > The Altera on board USB Blaster 3 utilizes a FT2232 and FT4232 > > chip. > > I assume it's either an FT2243 or an FT4232 and not both? > > > Add VID/PID for the on board USB Blaster 3 so it can be used > > as a serial device via ftdi_sio. > > Can you say something more about these devices? I guess they are used > for programming FPGAs? Are they embedded in other products? And can the > same PID be used for more than one type of device that they are embedded > in? Also, is there any actual software that can use them through this driver? The Altera 'quartus' software that is usually used to program (etc) the fpga is pretty proprietary. I think some bits have been reverse engineered, but only for a few simple actions. I'm not even sure the Altera code even loads a driver - just uses the userspace USB library. I'll have used it on a system with a custom kernel to program (etc) a CycloneV. No hint of needing to recompile a driver. (The sheer amount of software you need to command-line program a device is stunning! - I had to parcel it all up so we could use a usb to jtag cable to in-situ program one of the smaller PLD devices on a small board.) So what is the real 'use case'? David > > Or are the PIDs tied to different types of "USB Blaster 3"s? If so this, > should also be reflected in the naming of the defines.