Re: [9fans] gdbfs

[Gorka Guardiola Muzquiz <paurea@gmail.com>]

¿Have you taken a look at the jtag tar in my contrib?
It is described here
http://lsub.org/ls/export/jtag.pdf
I don´t know enough about the RealView ICE, but if you write
the right module for whatever drives the serial communications
maybe you can drive the jtag directly.
I don´t know if that would give you anything you don´t have already
but just in case you didn´t know :-)


> On 19 Dec 2013, at 06:12, Steven Stallion <sstallion@gmail.com> wrote:
> 
> Evening 9fans,
> 
> While working on the Chromebook (nee exynos) port I ended up in a
> situation where I needed to use a more sophisticated JTAG debugger to
> find an issue. I ended up grabbing a RealView ICE since they are
> relatively cheap on eBay (around 500.00USD) compared to other models
> capable of debugging Cortex-A15 cores. Older firmware revisions of the
> RVI support the remote GDB protocol (in addition to the closed RDDI
> protocol). I've written a simple 9P file server that translates
> memory/register accesses to remote GDB targets. I haven't tried it
> yet, but this should also work with OpenOCD as well.
> 
> At the moment this is little more than a toy, but it has been stable
> enough for me to debug issues on the board reliably. I've added
> support for ARM and i386 for now - adding additional register maps for
> the other mach types is straightforward. If there is enough demand,
> I'll write up a man page and submit a patch. The setup for this isn't
> particularly obvious since it requires some messing about with RVI
> firmware updates and downloading the right version of RVDS to setup
> the board, so a wiki page is deserved as well.
> 
> For now, you can find the source in my contrib directory on sources:
> /n/sources/contrib/stallion/src/gdbfs/
> 
> (Obligatory screenshot attached)
> 
> Cheers,
> 
> Steve
> <gdbfs.png>