diff options
| author | Heinrich Schuchardt <xypron.glpk@gmx.de> | 2020-08-17 13:35:39 +0300 |
|---|---|---|
| committer | Andes <uboot@andestech.com> | 2020-08-25 04:33:54 +0300 |
| commit | 27cef4e4a3ba791078534fda1dbeb814bd530ad5 (patch) | |
| tree | 8dfe240ef8c0791493fbdb5550a8708a700a2deb /doc | |
| parent | 092f15aee5bdebc010ad99120bab96162d9c64c8 (diff) | |
| download | u-boot-27cef4e4a3ba791078534fda1dbeb814bd530ad5.tar.xz | |
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>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/board/sipeed/maix.rst | 49 |
1 files changed, 49 insertions, 0 deletions
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 |