GSOC2016: Improvements in RTEMS Tracing Framework

[Chris Johns]

On 23/05/2016 23:19, Isaac Gutekunst wrote:
> Hi Vivek,
>
> This is looking good!

I agree.

> I somewhat sketchy solution for getting binary files off a target is to
> print them as intel hex, and copy them from the terminal. If the Zynq
> bsp supports networking, you could setup a TFTP server. My ugly trace
> implementation implements the lttng-live protocol for getting the CTF
> stream off the target.
>
> See
> https://github.com/lttng/lttng-tools/blob/master/doc/live-reading-protocol.txt
>
>
> Chris, do you think it's worth going down this path yet? I think this is
> the best long term solution, as it makes RTEMS targets with networking
> support remotely traceable with babeltrace and Trace Compass.
>

We will have to at some stage so what ever effort is spent should help 
us get a step closer. We just need monitor it does not stall the main 
focus of the work. At the moment it is looking like the best solution to 
getting data of the boards.

> I'm a little confused how the BSD, old style, and lwip networking stacks
> differ, and whether it would be possible to target all three easily.

This is a general area of confusion and flux.

> My
> understanding is that the existing stack, and the BSD stack both
> integrate into the RTEMS filesystem (have file descriptors), while LWIP
> has some super ugly macros that redefine read/write/etc.

Let me document here what currently exists for LibBSD stack and the 
legacy stack. Maybe Pavel can help with the LwIP stack.

Legacy Stack (stack in the RTEMS source tree):

1. Configured by tables and calls. Documented in the RTEMS Network 
Supplement.
2. Has network file system support for NFSv2, FTP and TFTP.

LibBSD Stack

1. Configured using FreeBSD rc.conf(5) format files. I have only just 
added this support and it is limited but functional interface with 
static configurations. I am working on this support. The tar support 
changes I have recently posted and the RTEMS print changes are all 
related to this support.
2. No networked file system support. This is an important issue that 
needs to be resolved.

Chris