[Embedded] Raspistrate about hacktoberfest HOT 4 OPEN

Since the cross compilation doesn't work, to get the binary substrate in ARM, the workaround is to get WASM blobs in x86 platform. Then copy WASM blobs into ARM platform and complete compilation there.
I got substrate binary in AWS a1. The detail process as following：

1. to get WASM blobs, compile substrate in x86 environment at first.
   1.1 clone source code
   git clone https://github.com/paritytech/substrate
   1.2 compile substrate, for reference:
   https://github.com/paritytech/substrate#hacking-on-substrate
   1.3 because of a bug for rust compiler, use nightly 2019-10-13
   rustup install nightly-2019-10-13
   cargo +nightly-2019-10-13 install --release

2. switch to ARM platform then compile substrate
   2.1 clone source code
   git clone https://github.com/paritytech/substrate
   2.2 skip WASM compilation via setting
   export SKIP_WASM_BUILD='true'
   2.3 compile substrate, for reference:
   https://github.com/paritytech/substrate#hacking-on-substrate
   2.4 because of a bug for rust compiler, use nightly 2019-10-13
   rustup install nightly-2019-10-13
   cargo +nightly-2019-10-13 install --release
   2.5 until compilation stopped, there is a message about wasm_binary.rs file missing. copy the file path and edit it.
   vi target/release/build/node-runtime-XXXXXXXXXX/wasm_binary.rs
   2.6 adding two lines of code. the content should be changed according to your compilation path.
   pub const WASM_BINARY: &[u8] = include_bytes!("/home/ubuntu/code/paritytech/substrate/target/release/wbuild/node-runtime/node_runtime.compact.wasm");
   pub const WASM_BINARY_BLOATY: &[u8] = include_bytes!("/home/ubuntu/code/paritytech/substrate/target/release/wbuild/target/wasm32-unknown-unknown/release/node_runtime.wasm");
   2.7 copy target/release/wbuild folder from x86 to target/release/wbuild
   scp ...........
   2.8 continue building
   cargo +nightly-2019-10-13 install --release
   2.9 end of building, get the binary successfully.

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I'd like to work on the issue and it is from real business requirement.

from hacktoberfest.

great, @juniuszhou , it's all yours. Let us know (best via chat or as a comment here), if there is anything you need from us or anything we can help with.

from hacktoberfest.

Nice! I'm glad to see that it worked :)

Just a reminder from our conversation.

I would like to suggest to keep it in the issue but clean your comment. Create a nice markdown format and general instructions.
It will also help if you add more details about the wasm_binary.rs file/paths.

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