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configs: defconfig for Sipeed Maix in S-mode
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.glpk@gmx.de> Reviewed-by: Bin Meng <bin.meng@windriver.com> Reviewed-by: Sean Anderson <seanga2@gmail.com>
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@ -4,7 +4,7 @@ S: Maintained
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F: arch/riscv/dts/k210.dtsi
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F: arch/riscv/dts/k210-maix-bit.dts
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F: board/sipeed/maix/
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F: configs/sipeed_maix_bitm_defconfig
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F: configs/sipeed_maix*_defconfig
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F: doc/board/sipeed/
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F: include/configs/sipeed-maix.h
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F: include/dt-bindings/*/k210-sysctl.h
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10
configs/sipeed_maix_smode_defconfig
Normal file
10
configs/sipeed_maix_smode_defconfig
Normal file
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@ -0,0 +1,10 @@
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CONFIG_RISCV=y
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CONFIG_SYS_TEXT_BASE=0x80020000
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CONFIG_TARGET_SIPEED_MAIX=y
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CONFIG_ARCH_RV64I=y
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CONFIG_RISCV_SMODE=y
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CONFIG_STACK_SIZE=0x100000
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# CONFIG_NET is not set
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# CONFIG_INPUT is not set
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# CONFIG_DM_ETH is not set
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# CONFIG_EFI_UNICODE_CAPITALIZATION is not set
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@ -75,6 +75,49 @@ console shall be opened immediately. Boot output should look like the following:
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Err: serial@38000000
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=>
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OpenSBI
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^^^^^^^
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OpenSBI is an open source supervisor execution environment implementing the
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RISC-V Supervisor Binary Interface Specification [1]. One of its features is
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to intercept run-time exceptions, e.g. for unaligned access or illegal
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instructions, and to emulate the failing instructions.
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The OpenSBI source can be downloaded via:
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.. code-block:: bash
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git clone https://github.com/riscv/opensbi
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As OpenSBI will be loaded at 0x80000000 we have to adjust the U-Boot text base.
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Furthermore we have to enable building U-Boot for S-mode::
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CONFIG_SYS_TEXT_BASE=0x80020000
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CONFIG_RISCV_SMODE=y
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Both settings are contained in sipeed_maix_smode_defconfig so we can build
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U-Boot with:
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.. code-block:: bash
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make sipeed_maix_smode_defconfig
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make
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To build OpenSBI with U-Boot as a payload:
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.. code-block:: bash
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cd opensbi
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make \
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PLATFORM=kendryte/k210 \
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FW_PAYLOAD=y \
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FW_PAYLOAD_OFFSET=0x20000 \
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FW_PAYLOAD_PATH=<path to U-Boot>/u-boot-dtb.bin
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The value of FW_PAYLOAD_OFFSET must match CONFIG_SYS_TEXT_BASE - 0x80000000.
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The file to flash is build/platform/kendryte/k210/firmware/fw_payload.bin.
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Loading Images
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^^^^^^^^^^^^^^
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@ -363,3 +406,9 @@ Address Size Description
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interrupts)
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0x8801f000 0x1000 credits
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========== ========= ===========
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Links
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-----
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[1] https://github.com/riscv/riscv-sbi-doc
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RISC-V Supervisor Binary Interface Specification
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