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doc: describe creating a pflash file for qemu-system-riscv64

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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.schuchardt@canonical.com>
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Heinrich Schuchardt 2025-01-23 03:46:51 +01:00
parent e20349a38c
commit 7a713ab1c6
1 changed files with 17 additions and 0 deletions
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doc/board/emulation/qemu-riscv.rst
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@ -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: