____ _ ____ ____
| _ \(_) ___ ___/ ___| ___ / ___|
| |_) | |/ __/ _ \___ \ / _ \| |
| __/| | (_| (_) |__) | (_) | |___
|_| |_|\___\___/____/ \___/ \____|
- Lattice Diamond
- riscv32-unknown-elf-gcc
- SPI Nor Flash (at least1MB, MX25Q32)
Open the project file picorv32/picorv32.ldf in Lattice Diamond:
Generate bitstream and upload:
Compile the firmware using riscv32-unknown-elf-gcc on PC:
$ cd firmware
$ make
Connect the SPI Nor Flash with Raspberry Pi:
- FLASH (VCC) --> Pi (3V3)
- FLASH (GND) --> Pi (GND)
- FLASH (CLK) --> Pi (SCLK)
- FLASH (CS) --> Pi (CS0)
- FLASH (DI) --> Pi (MISO)
- FLASH (DO) --> Pi (MOSI)
On Raspberry Pi (only used to flash the firmware to MX25Q32):
$ sudo flashrom -p linux_spi:dev=/dev/spidev0.0,spispeed=2000 -l rom.layout -i bootloader -w bootloader.bin
Connect the SPI Nor Flash with MXO2 FPGA:
- FLASH (VCC) --> MXO2 (3V3)
- FLASH (GND) --> MXO2 (GND)
- FLASH (CLK) --> MXO2 (P13)
- FLASH (CS) --> MXO2 (P3)
- FLASH (DI) --> MXO2 (N4)
- FLASH (DO) --> MXO2 (M4)
- USB TTL (RX) --> MXO2 (E3)
- USB TTL (TX) --> MXO2 (F3)
The serial port should print:
Press ENTER to continue..
____ _ ____ ____
| _ \(_) ___ ___/ ___| ___ / ___|
| |_) | |/ __/ _ \___ \ / _ \| |
| __/| | (_| (_) |__) | (_) | |___
|_| |_|\___\___/____/ \___/ \____|
Total memory: 0 KiB
Running memtest ..... passed
SPI State:
LATENCY 8
DDR OFF
QSPI OFF
CRM OFF
Select an action:
[1] Read SPI Flash ID
[2] Read SPI Config Regs
[3] Switch to default mode
[4] Switch to Dual I/O mode
[5] Switch to Quad I/O mode
[6] Switch to Quad DDR mode
[7] Toggle continuous read mode
[9] Run simplistic benchmark
[0] Benchmark all configs
[M] Run Memtest
[S] Print SPI state
[e] Echo UART
Command>
