Messages in this thread | | | Subject | Re: [PATCH] serial: DCC(JTAG) serial and console emulation support | From | Daniel Walker <> | Date | Thu, 07 Oct 2010 14:14:54 -0700 |
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On Thu, 2010-10-07 at 17:03 -0400, Mike Frysinger wrote: > On Thu, Oct 7, 2010 at 16:51, Daniel Walker wrote: > > On Thu, 2010-10-07 at 22:05 +0100, Alan Cox wrote: > >> On Thu, 07 Oct 2010 13:36:06 -0700 Daniel Walker wrote: > >> > On Thu, 2010-10-07 at 21:50 +0100, Alan Cox wrote: > >> > > > + Say Y here if you want to install DCC driver as a normal serial port > >> > > > + /dev/ttyS0 (major 4, minor 64). Otherwise, it appears as /dev/ttyJ0 > >> > > > + (major 4, minor 128) and can co-exist with other UARTs, such as > >> > > > + 8250/16C550 compatibles. > >> > > > + > >> > > > >> > > NAK to both > >> > > >> > I would agree if this wasn't strictly for debugging embedded devices in > >> > difficult situations.. After talking to Mike, it's seems like it would > >> > be useful to have this as a ttyS* specifically because embedded devices > >> > won't always create a ttyJ* for you and ttyS* will likely already exist. > >> > >> If you are debugging an embedded device you are capable of changing it > >> (otherwise you wouldn't debug it). Therefore the fact you might need to > >> tweak the tty creation on the device is not a problem. If you can't > >> change the device well there is no point debugging it is there ! > > > > Your making too many assumptions .. You might be able to modify the > > kernel, and not the userspace. So you couldn't tweak the device > > creation .. It's much easier in the server world .. > > this driver isnt in the kernel. there is no ABI to preserve. if > people want to use the mainline driver, they can fix their userspace. > i dont think the "binary userspace" argument is terribly relevant to > new driver submissions.
It is , what's to stop any userspace from using ttyS0 ? .. There's lots of binary userspaces in the embedded world, along with many strange usages ..
Daniel
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Sent by a consultant of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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