doc: document sbi command
Add a man-page for the sbi command.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/doc/usage/index.rst b/doc/usage/index.rst
index 6def250..eedcdb1 100644
--- a/doc/usage/index.rst
+++ b/doc/usage/index.rst
@@ -19,3 +19,4 @@
button
mbr
pstore
+ sbi
diff --git a/doc/usage/sbi.rst b/doc/usage/sbi.rst
new file mode 100644
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--- /dev/null
+++ b/doc/usage/sbi.rst
@@ -0,0 +1,49 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+sbi command
+===========
+
+Synopsis
+--------
+
+::
+
+ sbi
+
+Description
+-----------
+
+The sbi command is used to display information about the SBI (Supervisor Binary
+Interface) implementation on RISC-V systems.
+
+The output may look like:
+
+::
+
+ => sbi
+ SBI 0.2
+ OpenSBI
+ Extensions:
+ sbi_set_timer
+ sbi_console_putchar
+ sbi_console_getchar
+ sbi_clear_ipi
+ sbi_send_ipi
+ sbi_remote_fence_i
+ sbi_remote_sfence_vma
+ sbi_remote_sfence_vma_asid
+ sbi_shutdown
+ SBI Base Functionality
+ Timer Extension
+ IPI Extension
+ RFENCE Extension
+ Hart State Management Extension
+
+The first line indicates the version of the RISC-V SBI specification.
+The second line indicates the implementation.
+The further lines enumerate the implemented extensions.
+
+Configuration
+-------------
+
+To use the sbi command you must specify CONFIG_CMD_SBI=y.