"Das U-Boot" Source Tree
doc: qemu-riscv: describe running as flash image
Describe how to build U-Boot to be run by QEMU as an emulated flash image.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
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doc/board/emulation/qemu-riscv.rst
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doc/board/emulation/qemu-riscv.rst
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qemu-system-riscv64 -accel kvm -nographic -machine virt -kernel u-boot
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Running as flash binary
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U-Boot can be provided to QEMU as an emulated flash drive.
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This can for instance be used to test capsule updates.
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Build qemu-riscv64_smode_defconfig with::
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CONFIG_XIP=y
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CONFIG_TEXT_BASE=0x20000000
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CONFIG_CMD_MTD=y
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CONFIG_FLASH_CFI_MTD=y
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Pad u-boot.bin to 32 MiB size:
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.. code-block:: bash
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truncate -s 32M u-boot.bin
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Invoke QEMU with:
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.. code-block:: bash
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qemu-system-riscv64 -M virt -nographic \
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-drive if=pflash,format=raw,unit=0,file=u-boot.bin,readonly=off
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Debug UART
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