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-rw-r--r--docs/platform/sifive_fu540.md4
1 files changed, 4 insertions, 0 deletions
diff --git a/docs/platform/sifive_fu540.md b/docs/platform/sifive_fu540.md
index 7b14001..065fd4d 100644
--- a/docs/platform/sifive_fu540.md
+++ b/docs/platform/sifive_fu540.md
@@ -193,5 +193,9 @@ generated by QEMU, and u-boot.bin should be used as the payload image, like:
make PLATFORM=sifive/fu540 FW_PAYLOAD_PATH=<u-boot_build_dir>/u-boot.bin
```
+While the real hardware operates at the 64-bit mode, it's possible for QEMU to
+test the 32-bit OpenSBI firmware. This can be helpful for testing 32-bit SiFive
+specific drivers.
+
[U-Boot]: https://gitlab.denx.de/u-boot/u-boot/blob/master/doc/board/sifive/fu540.rst
[FSBL]: https://github.com/sifive/freedom-u540-c000-bootloader