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Switching to nextpnr since arachne-pnr is deprecated. #28

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Switching to nextpnr since arachne-pnr is deprecated. #28

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@jrincayc jrincayc commented Jul 6, 2020

This builds the json file that nextpnr needs, and also switches to using nextpnr.
Issue #23

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jrincayc commented Jul 8, 2020 •
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Note that without the -mabi=ilp32 the following error happens:

riscv32-unknown-elf-gcc -march=rv32imc -nostartfiles -Wl,-Bstatic,-T,sections.lds,--strip-debug,-Map=firmware.map,--cref  -ffreestanding -nostdlib -o firmware.elf start.S firmware.c
cc1: error: requested ABI requires '-march' to subsume the 'D' extension
cc1: error: requested ABI requires '-march' to subsume the 'D' extension

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