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@@ -41,13 +41,14 @@ make PLATFORM=sifive/fu540 FW_PAYLOAD_PATH=<linux_build_directory>/arch/riscv/bo
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**U-Boot Payload**
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The command-line example here assumes that U-Boot was compiled using the
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-sifive_fu540_defconfig configuration and with U-Boot v2020.01 (or higher).
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-
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-The detailed U-Boot booting guide is avaialble at [U-Boot].
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+sifive_fu540_defconfig configuration and with U-Boot v2020.01, and up to
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+v2020.07-rc3.
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```
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make PLATFORM=sifive/fu540 FW_PAYLOAD_PATH=<u-boot_build_dir>/u-boot-dtb.bin
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```
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+For U-Boot v2020.07-rc4 or later releases, SPL support was added in U-Boot.
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+Please refer to the detailed U-Boot booting guide available at [U-Boot].
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Flashing the OpenSBI firmware binary to storage media:
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------------------------------------------------------
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@@ -155,13 +156,37 @@ Linux kernel.
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When U-Boot v2020.01 (or higher) is used as the payload, as the SiFive FU540
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DTB for the real hardware is embedded in U-Boot binary itself, due to the same
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reason above, we need to switch the U-Boot sifive_fu540_defconfig configuration
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-from CONFIG_OF_SEPARATE to CONFIG_OF_PRIOR_STAGE so that U-Boot uses the DTB
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-generated by QEMU, and u-boot.bin should be used as the payload image, like:
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+from **CONFIG_OF_SEPARATE** to **CONFIG_OF_PRIOR_STAGE** so that U-Boot uses the
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+DTB generated by QEMU, and u-boot.bin should be used as the payload image, like:
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```
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make PLATFORM=sifive/fu540 FW_PAYLOAD_PATH=<u-boot_build_dir>/u-boot.bin
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```
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+U-Boot v2020.07 release added SPL support to SiFive HiFive Unleashed board,
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+hence a build error will be seen after you switch to **CONFIG_OF_PRIOR_STAGE**.
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+
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+```
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+./tools/mkimage: Can't open arch/riscv/dts/hifive-unleashed-a00.dtb: No such file or directory
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+./tools/mkimage: failed to build FIT
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+Makefile:1402: recipe for target 'u-boot.img' failed
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+make: *** [u-boot.img] Error 1
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+```
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+
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+The above errors can be safely ignored as we don't run U-Boot SPL under QEMU.
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+
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+Run:
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+```
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+qemu-system-riscv64 -M sifive_u -m 256M -nographic \
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+ -bios build/platform/sifive/fu540/firmware/fw_payload.bin
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+```
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+or
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+```
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+qemu-system-riscv64 -M sifive_u -m 256M -nographic \
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+ -bios build/platform/sifive/fu540/firmware/fw_jump.bin \
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+ -kernel <uboot_build_dir>/u-boot.bin
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+```
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+
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While the real hardware operates at the 64-bit mode, it's possible for QEMU to
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test the 32-bit OpenSBI firmware. This can be helpful for testing 32-bit SiFive
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specific drivers.
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