microwatt

Author	SHA1	Message	Date
Benjamin Herrenschmidt	b46f81fae4	Wishbone debug module This adds a debug module off the DMI (debug) bus which can act as a wishbone master to generate read and write cycles. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>	5 years ago
Benjamin Herrenschmidt	ee52fd4d80	Add a debug (DMI) bus and a JTAG interface to it on Xilinx FPGAs This adds a simple bus that can be mastered from an external system via JTAG, which will be used to hookup various debug modules. It's loosely based on the RiscV model (hence the DMI name). The module currently only supports hooking up to a Xilinx BSCANE2 but it shouldn't be too hard to adapt it to support different TAPs if necessary. The JTAG protocol proper is not exactly the RiscV one at this point, though I might still change it. This comes with some sim variants of Xilinx BSCANE2 and BUFG and a test bench. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>	5 years ago
Benjamin Herrenschmidt	1206dfe18c	Use a 3 way WB arbiter and cleanup fpga toplevel The 3rd master is currently unused, it will host the WB debug module. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>	5 years ago
Benjamin Herrenschmidt	d3acb5cce9	Switch soc to use std_ulogic Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>	5 years ago
Benjamin Herrenschmidt	3ac1dbc737	Share soc.vhdl between FPGA and sim Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>	5 years ago

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