Commit Graph

3 Commits (047be5c0c3b2f12c9321412518e17b7267fe14ea)

Author SHA1 Message Date
Anton Blanchard a750365ffa Remove some FPGA style signal inits
These don't work on the ASIC flow, so remove them and initialise
them explicitly where required.

Signed-off-by: Anton Blanchard <>
2 years ago
Paul Mackerras ca4eb46aea Make wishbone addresses be in units of doublewords or words
This makes the 64-bit wishbone buses have the address expressed in
units of doublewords (64 bits), and similarly for the 32-bit buses the
address is in units of words (32 bits).  This is to comply with the
wishbone spec.  Previously the addresses on the wishbone buses were in
units of bytes regardless of the bus data width, which is not correct
and caused problems with interfacing with externally-generated logic.

Signed-off-by: Paul Mackerras <>
3 years ago
Paul Mackerras f06ffcf9b7 Add a GPIO controller and use it to drive the shield I/O pins on the Arty
This adds a GPIO controller which provides 32 bits of I/O.  The
registers are modelled on the set used by the gpio-ftgpio010.c driver
in the Linux kernel.  Currently there is no interrupt capability
implemented, though an interrupt line from the GPIO subsystem to the
XICS has been connected.

For the Arty A7 board, GPIO lines 0 to 13 are connected to the pins
labelled IO0 to IO13 on the "shield" connector, GPIO lines 14 to 29
connect to IO26 to IO41, GPIO line 30 connects to the pin labelled A
(aka IO42), and GPIO line 31 is connected to LED 7.

Signed-off-by: Paul Mackerras <>
3 years ago