Dave, I see a discussion on openocd and rpi4 on
the raspberrypi forum:
https://www.raspberrypi.org/forums/viewtopic.php?t=252551
There seems to be a couple of different problems being
addressed, but some claims of success. I'm sorry I can't
test any of the solutions with a 7i90, since I don't have
a working pi 4 available at present.
-- Ralph
________________________________________
From: dave engvall [dengv...@charter.net]
Sent: Tuesday, March 9, 2021 7:36 PM
To: Enhanced Machine Controller (EMC)
Subject: [Emc-users] Rpi4B_7i90
CAUTION: This email originated from outside the Walla Walla University email
system.
Hi all,
I'm trying to get an Rpi4b -> 7i90 going.
Ralph Stirling made an interface board for the pi that allows one to
flash the spi.
The following is copy of the procedure:
On Rpi:
$ git clone git://git.code.sf.net/p/openocd/code openocd
$ cd openocd
$ ./bootstrap
$ ./configure --enable-maintainer-mode --enable-bcm2835gpio
--enable-sysfsgpio
$ make -j4
$ sudo make install
Go into Raspbian Setup from the application menu, and turn off SPI
device driver. Openocd has a builtin driver.
Use the openocd_rpi.sh script to load bitstreams via jtag
into the FPGA itself. This is not permanent, so you need
to follow this with mesaflash to put it in the EEPROM.
$openocd_rpi.sh whatever_spi_bitstream.bit
Now go back in to Raspbian Setup and turn on the SPI driver. You can now
use mesaflash to flash the EEPROM.
$ sudo mesaflash --device 7i90 --addr /dev/spidev0.0 --spi --write
whatever_spi_bitstream.bit
I don't recall whether SPI needs to be enabled or disabled
after this for hostmot2 to run in linuxcnc, but it is easy
enough to try each way.
Ha! Not quite.
Google gives hits but none of them go deep enough to fix my problems.
Clearly this is set up for bcm2835 eg. Rpi3b however just editing the
bcm numbers to Rpi4b 2711 doesn't work.
Deeper changes are clearly needed.
Can anyone supply the relevant files for bcm2711?
Comments and guidance appreciated.
Dave
file: rpi_jtag.cfg
interface bcm2835gpio
bcm2835gpio_peripheral_base 0x3F000000
# Transition delay calculation: SPEED_COEFF/khz - SPEED_OFFSET
# These depend on system clock, calibrated for stock 700MHz
# bcm2835gpio_speed SPEED_COEFF SPEED_OFFSET
bcm2835gpio_speed_coeffs 146203 36
# Each of the JTAG lines need a gpio number set: tck tms tdi tdo
## Header pin numbers: 23 22 19 21
#bcm2835gpio_jtag_nums 11 25 10 9
# Header pin numbers: 11 13 15 29
bcm2835gpio_jtag_nums 17 27 22 5
file: openocd_rpi.sh
#!/bin/bash
openocd \
-f /usr/local/share/openocd/scripts/interface/rpi_jtag.cfg \
-f /usr/local/share/openocd/scripts/cpld/xilinx-xc6s.cfg \
-c "adapter driver rpi_jtag ; adapter speed 500; init; \
xc6s_program xc6s.tap; pld load 0 $1 ; exit"
Stick that in a file, chmod +x it and see if it works!
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