[edk2-staging/RISC-V PATCH v1 6/14]: RiscVPkg/opesbi: Add opensbi-HOWTO.txt

["Abner Chang" <abner.chang@hpe.com>]

Add opensbi-HOWTO.txt for users to build RISC-V platform with RISC-V OpenSBI library.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Abner Chang <abner.chang@hpe.com>
---
 RiscVPkg/opensbi/opensbi-HOWTO.txt | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 RiscVPkg/opensbi/opensbi-HOWTO.txt

diff --git a/RiscVPkg/opensbi/opensbi-HOWTO.txt b/RiscVPkg/opensbi/opensbi-HOWTO.txt
new file mode 100644
index 0000000..aff7a69
--- /dev/null
+++ b/RiscVPkg/opensbi/opensbi-HOWTO.txt
@@ -0,0 +1,17 @@
+================================================================================
+                              Instroduction
+================================================================================
+RISC-V Open Source Supervisor Binary Interface (OpenSBI) is an open source
+implementation (Refer to https://github.com/riscv/opensbi) of RISC-V SBI spec
+(Refer to https://github.com/riscv/riscv-sbi-doc), whcih is designed for the
+platform-specific firmwares executing in RISC-V Machine mode (M-mode).
+EDK2 RISC-V port leverage OpenSBI source files and build it into EDK2 RISC-V
+OpenSBI library (RiscVPkg/Library/RiscVOpensbiLib) using edk2 toolchain.
+
+User has to get OpenSBI source code and put it under RiscVPkg/opensbi using below
+command before building RISC-V platform in EDK2 build environment.
+
+Current supported RISC-V OpenSBI version on EDK2 is v0.4
+
+  $ git clone https://github.com/riscv/opensbi
+  $ git checkout tags/v0.4
-- 
2.7.4