Re: [PATCH 01/18] Altera FPGA firmware download module.

From: Laurent Pinchart
Date: Wed Jan 05 2011 - 05:25:28 EST


On Friday 31 December 2010 16:04:13 Ben Gamari wrote:
> On Fri, 31 Dec 2010 09:47:41 -0200, Mauro Carvalho Chehab wrote:
> > > 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.
> Why? I agree that JTAG is a lot to place in the kernel and is much
> better suited to be in user space. What exactly is your objection to
> depending on a userspace utility? There is no shortage of precedent for
> loading firmware in userspace (e.g. fx2 usb devices).

I agree with this. Mauro, why would a userspace firmware loader be such a bad
idea ?

> > > 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.
> I agree with the above isn't good reason to block it but if there is
> still debate about the general architecture of the code (see above),
> then it seems aren't ready yet. The code looks very nice, but I'm not at
> all convinced that it needs to be in the kernel. Just my two-tenths of a
> cent.


Laurent Pinchart
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