Commit Graph

10 Commits (e31a4f7a9a14ae188af6de385f9f24a5122b97f5)

Author SHA1 Message Date
Anton Blanchard 7cfbcd5514 litesdcard: Add Nexys Video support
This board has a reset line that needs to be held low to power up the
SD card hardware.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Anton Blanchard 458dfe01a6 Add liteeth support to Nexys Video
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Anton Blanchard 75e06a1e30 Remove -add from xdc files
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Anton Blanchard 187199c489 Remove -waveform from xdc files
A 50% duty cycle is the default, so no need to use -waveform.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Benjamin Herrenschmidt cc4dcb3597 spi: Add SPI Flash controller
This adds an SPI flash controller which supports direct
memory-mapped access to the flash along with a manual
mode to send commands.

The direct mode can be set via generic to default to single
wire or quad mode. The controller supports normal, dual and quad
accesses with configurable commands, clock divider, dummy clocks
etc...

The SPI clock can be an even divider of sys_clk starting at 2
(so max 50Mhz with our typical Arty designs).

A flash offset is carried via generics to syscon to tell SW about
which portion of the flash is reserved for the FPGA bitfile. There
is currently no plumbing to make the CPU reset past that address (TBD).

Note: Operating at 50Mhz has proven unreliable without adding some
delay to the sampling of the input data. I'm working in improving
this, in the meantime, I'm leaving the default set at 25 Mhz.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt 5ae5f76558 arty/nexys-video: Update XDC
The DRAM related pins have some small changes in LiteX, so resync
and add the false path information as well.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt 2cef3005cd fpga: Hookup nexys-video to litedram
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Anton Blanchard 20674e0d65 Add SPI configuration to Xilinx constraint files
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
4 years ago
Anton Blanchard a53ad60014 Rename a few reset signals
clk -> ext_clk
reset_n -> ext_rst
reset -> rst

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
5 years ago
Anton Blanchard 5a29cb4699 Initial import of microwatt
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
5 years ago