Provide a defconfig that can be used to build U-Boot for the Maix boards
running upon OpenSBI.
Update the documentation.
Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
---
configs/sipeed_maix_smode_defconfig | 10 ++++++
doc/board/sipeed/maix.rst | 49 +++++++++++++++++++++++++++++
2 files changed, 59 insertions(+)
create mode 100644 configs/sipeed_maix_smode_defconfig
diff --git a/configs/sipeed_maix_smode_defconfig
b/configs/sipeed_maix_smode_defconfig
new file mode 100644
index 0000000000..2516bb7258
--- /dev/null
+++ b/configs/sipeed_maix_smode_defconfig
@@ -0,0 +1,10 @@
+CONFIG_RISCV=y
+CONFIG_SYS_TEXT_BASE=0x80020000
+CONFIG_TARGET_SIPEED_MAIX=y
+CONFIG_ARCH_RV64I=y
+CONFIG_RISCV_SMODE=y
+CONFIG_STACK_SIZE=0x100000
+# CONFIG_NET is not set
+# CONFIG_INPUT is not set
+# CONFIG_DM_ETH is not set
+# CONFIG_EFI_UNICODE_CAPITALIZATION is not set
diff --git a/doc/board/sipeed/maix.rst b/doc/board/sipeed/maix.rst
index b1894f3a6f..efcde9aebf 100644
--- a/doc/board/sipeed/maix.rst
+++ b/doc/board/sipeed/maix.rst
@@ -75,6 +75,49 @@ console shall be opened immediately. Boot output should look
like the following:
Err: serial@38000000
=>
+OpenSBI
+^^^^^^^
+
+OpenSBI is an open source supervisor execution environment implementing the
+RISC-V Supervisor Binary Interface Specification [1]. One of its features is
+to intercept run-time exceptions, e.g. for unaligned access or illegal
+instructions, and to emulate the failing instructions.
+
+The OpenSBI source can be downloaded via:
+
+.. code-block:: bash
+
+ git clone https://github.com/riscv/opensbi
+
+As OpenSBI will be loaded at 0x80000000 we have to adjust the U-Boot text base.
+Furthermore we have to enable building U-Boot for S-mode::
+
+ CONFIG_SYS_TEXT_BASE=0x80020000
+ CONFIG_RISCV_SMODE=y
+
+Both settings are contained in sipeed_maix_smode_defconfig so we can build
+U-Boot with:
+
+.. code-block:: bash
+
+ make sipeed_maix_smode_defconfig
+ make
+
+To build OpenSBI with U-Boot as a payload:
+
+.. code-block:: bash
+
+ cd opensbi
+ make \
+ PLATFORM=kendryte/k210 \
+ FW_PAYLOAD=y \
+ FW_PAYLOAD_OFFSET=0x20000 \
+ FW_PAYLOAD_PATH=<path to U-Boot>/u-boot-dtb.bin
+
+The value of FW_PAYLOAD_OFFSET must match CONFIG_SYS_TEXT_BASE - 0x80000000.
+
+The file to flash is build/platform/kendryte/k210/firmware/fw_payload.bin.
+
Loading Images
^^^^^^^^^^^^^^
@@ -363,3 +406,9 @@ Address Size Description
interrupts)
0x8801f000 0x1000 credits
========== ========= ===========
+
+Links
+-----
+
+[1] https://github.com/riscv/riscv-sbi-doc
+ RISC-V Supervisor Binary Interface Specification
--
2.28.0
