U-Boot can be executed in place from a flash device. Describe how this can be emulated on RISC-V QEMU.
Signed-off-by: Heinrich Schuchardt <heinrich.schucha...@canonical.com> --- doc/board/emulation/qemu-riscv.rst | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/doc/board/emulation/qemu-riscv.rst b/doc/board/emulation/qemu-riscv.rst index 8388e13d96d..cf2f893b723 100644 --- a/doc/board/emulation/qemu-riscv.rst +++ b/doc/board/emulation/qemu-riscv.rst @@ -42,6 +42,23 @@ use the configurations qemu-riscv32_smode_defconfig and qemu-riscv64_smode_defconfig instead. Note that U-Boot running in supervisor mode requires a supervisor binary interface (SBI), such as RISC-V OpenSBI. +To create a U-Boot binary that can be utilized with a pflash device in QEMU +apply these addtional settings to qemu-riscv64_smode_defconfig: + +:: + + CONFIG_TEXT_BASE=0x20000000 + CONFIG_XIP=y + # CONFIG_AVAILABLE_HARTS is not set + CONFIG_SYS_MONITOR_BASE=0x80200000 + +Truncate the resulting u-boot.bin to 32 MiB. Add the following to your +qemu-system-riscv64 command: + +.. code-block:: bash + + -drive if=pflash,format=raw,unit=0,file=u-boot.bin + Running U-Boot -------------- The minimal QEMU command line to get U-Boot up and running is: -- 2.47.1
