Risc-V Stability Across Reboots

With this version, the Risc-V controller is now able to keep working even across reflashing the FPGA. This has proven very useful for developing a new USB stack.

Raspberry Pi SPI Mode

v0.3.0 adds SPI support for arm, armv7, and aarch64 builds.

If you have a Fomu EVT, you can use 2-, 3-, or 4-wire SPI support to enable debugging the USB stack.

Other platforms do not yet have SPI support, but pull requests are welcome to add more!

MMU debug support

travis: re-enable other platforms

Signed-off-by: Sean Cross <sean@xobs.io>

Proper Serial support

This release adds Serial support! Use --serial [/path/to/serial/port] in order to access a Wishbone bus exposed via serial.

Works on all release platforms, including Windows.

v0.2.6: uart: add a first cut of a uart bridge

Allow users to specify --uart, in order to communicate with a target
device over a serial connection.

Signed-off-by: Sean Cross <sean@xobs.io>

v0.2.5: gdb: improve reliability and error messages during disconnects

If the device goes away (for example, during a reboot), reconnect to it.

The gdb client shouldn't need to care that this has happened, but it'd
be a good idea to print out messages on the console.

Signed-off-by: Sean Cross <sean@xobs.io>

v0.2.4: gdb: add empty response to "qTStatus" packet

We don't support trace status, but at least acknowledge it exists.

Signed-off-by: Sean Cross <sean@xobs.io>

v0.2.3: riscv: fix hardware breakpoints -- sync pc through threads

Now that we are properly synchronizing PC across threads, hardware
breakpoints now function correctly.

Signed-off-by: Sean Cross <sean@xobs.io>

v0.2.2: riscv: add cache flushing and pc-saving

Flush the cache as necessary.

Also, when we hit a breakpoint, save the program counter so we can
restore it later.

Signed-off-by: Sean Cross <sean@xobs.io>

v0.2.1: random-test: add option to limit number of random loops

For reliability tests, add a parameter to limit the maximum number of
successful loops to run through before we exit.

Signed-off-by: Sean Cross <sean@xobs.io>