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current board that doesn work with flto is spresense and mimxrt10xx (due
to xip image_vector_table is optimized out).
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LTO is temporary disabled
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When BOARD=fomu, use the riscv cross-compiler. Otherwise, use the
default arm compiler. This can be overridden by passing
CROSS_COMIPLE on the command line.
Note that there are now three common risc-v prefixes:
- riscv32-unknown-elf- : Common for users who compile their own
- riscv64-unknown-elf- : Upstream multiarch toolchain from SiFive
- riscv-none-embed- : xPack embedded version of SiFive toolchain
Here we assume users are using the `riscv-none-embed-` toolchain from
xPack, because it appears to be growing more common. Additionally,
there is much confusion surrounding `riscv64-unknown-elf-`, which
actually includes both 32- and 64-bit runtimes and can generate software
for both.
Signed-off-by: Sean Cross <[email protected]>
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add uart write to board test example
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started with pca10056
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non-stack warning (probably mcu driver) should be suppressed in the
board.mk
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close #125
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