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@@ -29,7 +29,10 @@ in `riscv` dependency crate or RustSBI library itself.
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## Minimum supported Rust version
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-To compile this project, you may need at least nightly Rust version of `rustc 1.59.0-nightly (c5ecc1570 2021-12-15)`.
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+To compile RustSBI library, you need at least stable Rust version of `rustc 1.64.0`.
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+
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+If you are using feature `singleton` or `legacy` to support legacy SBI extensions, you are required to install
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+nightly Rust compiler. You may need at least nightly Rust version of `rustc 1.59.0-nightly (c5ecc1570 2021-12-15)`.
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## Binary downloads
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