Em Sun, 24 Feb 2013 03:16:35 +0000 Ben Hutchings <b...@decadent.org.uk> escreveu:
> On Fri, 2013-02-22 at 19:30 -0500, Joseph Yasi wrote: > > Hi, > > > > I'm not sure the appropriate list to email for this, but the > > v4l-cx23885-enc.fw file in the linux-firmware.git tree is incorrect. > > It is the wrong size and just a duplicate of the > > v4l-cx23885-avcore-01.fw. The correct file can be extracted from the > > HVR1800 drivers here: http://steventoth.net/linux/hvr1800/. > > This was previously requested > <http://thread.gmane.org/gmane.linux.drivers.video-input-infrastructure/57816> > but unfortunately it's not clear that it would be legal to redistribute > firmware extracted from that driver (or the driver itself). (c/c Conexant developers, Andy and Hans) Let's see if we can once for all fix this issue. So, let me do a summary of the firmware situation here. Basically, the firmwares at linux-kernel are the ones that Conexant gave us license to re-distribute. According with Conexant, there's one firmware that it is the same for two different chips. On their words: "The Merlin firmware are the same for 418 and 416/7." The envolved Conexant firmwares are the ones used by cx23885-417.c, cx231xx-417.c and cx25850.c: $ git grep v4l-cx23885-enc.fw drivers/media drivers/media/pci/cx23885/cx23885-417.c:#define CX23885_FIRM_IMAGE_NAME "v4l-cx23885-enc.fw" drivers/media/usb/cx231xx/cx231xx-417.c:#define CX231xx_FIRM_IMAGE_NAME "v4l-cx23885-enc.fw" $ grep "define.*FIRM" drivers/media/i2c/cx25840/cx25840-firmware.c #define CX2388x_FIRMWARE "v4l-cx23885-avcore-01.fw" #define CX231xx_FIRMWARE "v4l-cx231xx-avcore-01.fw" #define CX25840_FIRMWARE "v4l-cx25840.fw" Those are the Conexant firmware files that we currently have at linux-firmware: -rw-rw-r-- 1 v4l v4l 16382 Ago 10 2012 v4l-cx231xx-avcore-01.fw -rw-rw-r-- 1 v4l v4l 141200 Ago 10 2012 v4l-cx23418-apu.fw -rw-rw-r-- 1 v4l v4l 158332 Ago 10 2012 v4l-cx23418-cpu.fw -rw-rw-r-- 1 v4l v4l 16382 Ago 10 2012 v4l-cx23418-dig.fw -rw-rw-r-- 1 v4l v4l 16382 Ago 10 2012 v4l-cx23885-avcore-01.fw -rw-rw-r-- 1 v4l v4l 16382 Ago 10 2012 v4l-cx23885-enc.fw -rw-rw-r-- 1 v4l v4l 16382 Ago 10 2012 v4l-cx25840.fw And those are their corresponding md5sum: 7d3bb956dc9df0eafded2b56ba57cc42 v4l-cx231xx-avcore-01.fw 588f081b562f5c653a3db1ad8f65939a v4l-cx23418-apu.fw b6c7ed64bc44b1a6e0840adaeac39d79 v4l-cx23418-cpu.fw 95bc688d3e7599fd5800161e9971cc55 v4l-cx23418-dig.fw a9f8f5d901a7fb42f552e1ee6384f3bb v4l-cx23885-avcore-01.fw a9f8f5d901a7fb42f552e1ee6384f3bb v4l-cx23885-enc.fw dadb79e9904fc8af96e8111d9cb59320 v4l-cx25840.fw So, yes, v4l-cx23885-avcore-01.fw and v4l-cx23885-enc.fw files are identical on the official released firmwares, and both have 16K. Now, Hauppauge is using different firmwares for v4l-cx23885-enc.fw and v4l-cx23885-avcore-01.fw. After extracting the firmware from their zip file, we have: -r--r--r-- 1 v4l v4l 376836 Fev 24 08:47 v4l-cx23885-enc.fw -r--r--r-- 1 v4l v4l 16382 Fev 24 08:47 v4l-cx23885-avcore-01.fw With different checksums: b3704908fd058485f3ef136941b2e513 v4l-cx23885-avcore-01.fw 1cb3c48a6684126f5e503a434f2d636b v4l-cx23885-enc.fw So: 1) With regards to the encoder firmware for cx23885-417, both Conexant and Hauppauge, provided a firmware with 16KB. Although they're different. Not sure if they are just different versions, or if Hauppauge customized it on their driver. 2) With regards to the decoder firmware for cx25840 (actually, the equivalent IP block inside cx23885), while Conexant provided us with a 16KB firmware, and both decoder and encoder using the very same firmware, Hauppauge's driver is shipped with a 372KB firmware. What's more intriguing is that the firmware size is so different between those two versions. Also, having the encoder and the decoder using the same firmware looks weird. In any case, it is clear, from the reports, that the cx25840 driver doesn't work with the 16KB v4l-cx23885-enc.fw firmware provided by Conexant. It should also be noticed that the other firmwares used by cx25840 driver also has only 16 KB. So, I can see two possible situations here: 1) Conexant shipped us a wrong v4l-cx23885-enc.fw; 2) Hauppauge uses a completely different version for it, perhaps developed by them, and the driver was written to take that special version into account. So, the driver is not currently prepared to use the Conexant firmware for cx23885. As I didn't work on the development of this driver, nor I worked with HVR1800 development, I can't tell what of the above is the case. There are two possible solutions to solve the issue it: 1) Conexant could help us to make the cx23885 driver to work with their firmware, or release us the right firmware, (if this was simply a mistake when they sent us the firmwares). The driver could be smart enough to work with either firmware (it should be easy to distinguish between them, due to the huge difference on its size); 2) Hauppauge should re-license their v4l-cx23885-enc.fw firmware to allow it to be shipped together with linux-firmware; > For now, I think we should delete the current version. That seems to be the only approach left, if neither Conexant or Hauppauge could help solving this dilema. Regards, Mauro -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
