Em 31-12-2010 09:30, Laurent Pinchart escreveu: > Hi Mauro, > > On Friday 31 December 2010 12:27:38 Mauro Carvalho Chehab wrote: >> Em 31-12-2010 09:12, Laurent Pinchart escreveu: >>> Hi Igor, >>> >>> On Friday 31 December 2010 06:26:31 Igor M. Liplianin wrote: >>>> It uses STAPL files and programs Altera FPGA through JTAG. >>>> Interface to JTAG must be provided from main device module, >>>> for example through cx23885 GPIO. >>> >>> It might be a bit late for this comment (sorry for not having noticed the >>> patch set earlier), but... >>> >>> Do we really need a complete JTAG implementation in the kernel ? Wouldn't >>> it better to handle this in userspace with a tiny kernel driver to >>> access the JTAG signals ? >> >> Laurent, >> >> Igor already explained it. From what I understood, the device he is >> working has a firmware that needs to be loaded via JTAG/FPGA. > > I understand this. However, a complete JTAG state machine in the kernel, plus > an Altera firmware parser, seems to be a lot of code that could live in > userspace.
Moving it to userspace would mean a kernel driver that would depend on an userspace daemon^Wfirmware loader to work. I would NAK such designs. The way it is is fine from my POV. >> Actually, I liked the idea, as the FPGA programming driver could be >> useful if other drivers have similar usecases. > > If I understand it correctly the driver assumes the firmware is in an Altera > proprietary format. If we really want JTAG code in the kernel we should at > least split the file parser and the TAP access code. > Agreed, but I don't think this would be a good reason to block the code merge for .38. Cheers, 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
