https://github.com/anse1/olimex-ice40-notes
Notes on flashing the ice40 board(s) by Olimex using a raspberry pi
https://github.com/anse1/olimex-ice40-notes
Last synced: 5 months ago
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Notes on flashing the ice40 board(s) by Olimex using a raspberry pi
- Host: GitHub
- URL: https://github.com/anse1/olimex-ice40-notes
- Owner: anse1
- Created: 2017-03-12T10:29:01.000Z (about 9 years ago)
- Default Branch: master
- Last Pushed: 2017-03-25T18:41:15.000Z (about 9 years ago)
- Last Synced: 2023-08-03T13:23:33.354Z (almost 3 years ago)
- Size: 179 KB
- Stars: 6
- Watchers: 3
- Forks: 2
- Open Issues: 0
-
Metadata Files:
- Readme: README.org
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README
** Notes on flashing the ice40 board(s) by Olimex using a raspberry pi
If you have a raspberry PI around, you can use the flashrom utility
with Linux' /dev/spidev to program a bitstream to your ICE40HX1K-EVB.
The following table shows the wiring required for the Pi B+ or 2. I
used IDC connectors with a rainbow ribbon for convenient wiring (image
below).
| Raspi 2/B+ | | ICE40-EVB | | comment |
|------------+----------+-----------+--------------+----------|
| 17 | =3v3= | 1 | =3v3= | |
| 18 | =gpio24= | 6 | =creset= | |
| 19 | =mosi= | 8 | =sdo= | |
| 20 | =gnd= | 2 | =gnd= | |
| 21 | =miso= | 7 | =sdi= | |
| 22 | =gpio25= | 5 | =cdone= | optional |
| 23 | =clk= | 9 | =sck= | |
| 24 | =ce0= | 10 | =#cd = ss_b= | |
| 25 | =gnd= | | | |
| 26 | =ce1= | | | |
enable SPI device on the Pi (needs reboot)
: echo dtparam=spi=on >> /boot/config.txt
build and install flashrom
: git clone https://www.flashrom.org/git/flashrom.git
: cd flashrom
: make CONFIG_ENABLE_LIBPCI_PROGRAMMERS=no CONFIG_ENABLE_LIBUSB0_PROGRAMMERS=no CONFIG_ENABLE_LIBUSB1_PROGRAMMERS=no install
claim GPIO24 for sysfs-control
: echo 24 > /sys/class/gpio/export
Pull GPIO24 low to put the ice40 into reset. The cdone-LED on the board should turn off.
: echo out > /sys/class/gpio/gpio24/direction
Read the flash chip at 20MHz (for short cabling)
: flashrom -p linux_spi:dev=/dev/spidev0.0,spispeed=20000 -r dump
Simply swap -r for -w to write the dump back
: flashrom -p linux_spi:dev=/dev/spidev0.0,spispeed=20000 -w dump
As generated bitstreams are smaller than size of the flash chip, you
need to add padding for flashrom to accept them as image. I used the
follwing commands to do that:
: tr '\0' '\377' < /dev/zero | dd bs=2M count=1 of=image
: dd if=my_bitstream conv=notrunc of=image
Deassert creset to let the ice40 read the configuration from the bus:
: echo in > /sys/class/gpio/gpio24/direction
[[wiring.jpg]]