WIP: Icesugar support #49
Conversation
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Hi. I stumbled across this comment in https://github.com/wuxx/icesugar/blob/master/src/basic/verilog/flash/top.v
Invert the relevant pin definitions in BOARDS/icesugar.pcf to:
...and it seems to work fine - firmware can be flashed at 0x20000 and Femtosoc will execute the program from flash. PS: I'm compiling firmware on WSL2 and then executing icesprog in windows to do the uploading as WSL doesn't support USB devices on Windows host. To flash the firmware (eg hello.c) I use
...because icesprog doesn't seem to support text offsets as used in the FIRMWARE/makefile.inc (iceprog -o 128k ....) |
Somehow i completely missed your comment - thanks, i'll give it a shot later today, or tomorrow. |
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Indeed, after inverting spi MISO/MOSI, i successfully flashed hello world and see it execute from flash. |
Signed-off-by: Paolo Pisati <[email protected]>
Signed-off-by: Paolo Pisati <[email protected]>
Signed-off-by: Paolo Pisati <[email protected]>
…disable old and lex matrix pmods Signed-off-by: Paolo Pisati <[email protected]>
Signed-off-by: Paolo Pisati <[email protected]>
Signed-off-by: Paolo Pisati <[email protected]>
… use the same chip family)
Signed-off-by: Paolo Pisati <[email protected]>
…mory mapped @ 0x800000 Signed-off-by: Paolo Pisati <[email protected]>
Signed-off-by: Paolo Pisati <[email protected]>
Signed-off-by: Paolo Pisati <[email protected]>
The Icesugar board is a close relative (clone?) of the Icebreaker board: iCE40UP5K, 12Mhz clock, 3 PMODS (well, technically four if you solder one header), 8MB SPI flash, etc and while it was already mentioned in FemtoRV, the target didn't build.
This pull request is a WIP (aka builds but don't run) and reviews/comments/ pointers are welcome: i went with the FEMTORV32_QUARK (since GRACILIS didn't fit, werird since sugar and breaker share the same exact fpga chip - BTW, is FEMTO good enough to run code from flash?) and had to execute code from SPI flash (since firmware.hex was ~45KB and blew past the available 12KB BRAM), on top of that SPI flash is only 8MB (vs 16MB in Icebreaker - see also NRV_RESET_ADDR) and i still have to figure out FemtoRV/FIRMWARE/CRT/spiflash*.ld blackmagic.
I already checked the pcf against the schematics (so that part should be correct), while i'm a bit worried about code execution from flash/linker script errors and wouldn't be surprised if i overlooked something there.
Let me know.