add English to README.md [from 99ashutosh/rustsbi-hifive-unmatched-en]

README.md

@@ -1,3 +1,64 @@
+# RustSBI support software for HiFive Unmatched boards
+
+The purpose of this project is to support RustSBI on SiFive [HiFive Unmatched](https://www.sifive.com/boards/hifive-unmatched) boards.
+RustSBI is a bootloader environment; when the motherboard is powered up, RustSBI will start first, then it will find a bootable operating system and boot it.
+After startup, RustSBI still resides in the background, providing the functionality required by the operating system.
+The design of RustSBI fully complies with the RISC-V SBI specification standard. As long as the operating system supports this standard, RustSBI can be used to boot.
+
+## Compile and Run
+
+This project uses the xtask framework and can be compiled with the following instructions:
+
+```shell
+cargo image
+```
+
+(If the --release parameter is added, it means that the release version without debugging symbols is compiled)
+
+At this time, the compilation produces an elf file and an img image. Note that the generated intermediate data bin file cannot be directly used for burning.
+
+Use the following operations to burn the img format image to the sd card partition. (Dangerous! Data must be backed up first)
+
+```shell
+sudo dd if=target/sd-card-partition-2.img of=\\?\Device\Harddisk????\Partition2 --progress
+```
+
+After the burning is complete, you can use RustSBI to boot.
+
+## Rust Version
+
+Compiling this project requires at least the Rust version of `rustc 1.59.0-nightly (c5ecc1570 2021-12-15)`.
+
+## Documentation
+
+Please refer to the [Project Wiki](https://github.com/rustsbi/rustsbi-hifive-unmatched/wiki) for complete documentation.
+
+The parts of the project that still need to be perfected are also documented in [here](https://github.com/rustsbi/rustsbi-hifive-unmatched/wiki/Next…).
+
+## Support scheme for large and small core design
+
+The HiFive Unmatched motherboard has a SiFive Freedom U740 processor onboard. The FU740 is a heterogeneous multi-core processor, it has a total of five cores.
+Its five cores are four U74 application processor cores and one S7 embedded processor core.
+
+As developers of the software implementation of RustSBI, we noticed that the S7 management corelet will have a wide range of uses.
+Therefore, RustSBI does not block any cores on HiFive Unmatched for the operating system to choose and use.
+
+## useful links
+
+- HiFive Unmatched Getting Started Guide (Chinese) Version 1.4 [PDF](https://sifive.cdn.prismic.io/sifive/b9376339-5d60-45c9-8280-58fd0557c2f0_hifive-unmatched-gsg-v1p4_EN.pdf)
+- SiFive FU740-000 Manual v1p3 [PDF](https://sifive.cdn.prismic.io/sifive/de1491e5-077c-461d-9605-e8a0ce57337d_fu740-c000-manual-v1p3.pdf)
+
+## Command Line
+
+View assembly code
+
+```
+cargo asm
+```
+
+---
+---
+
 # RustSBI 在 HiFive Unmatched 主板的支持软件
 
 这个项目的目的是在SiFive [HiFive Unmatched](https://www.sifive.com/boards/hifive-unmatched)主板上支持RustSBI。