diff options
| -rw-r--r-- | docs/platform/sifive_fu540.md | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/docs/platform/sifive_fu540.md b/docs/platform/sifive_fu540.md index 0a9f21e..94eb81f 100644 --- a/docs/platform/sifive_fu540.md +++ b/docs/platform/sifive_fu540.md @@ -183,3 +183,13 @@ same instructions above, with the exception of not passing FW_PAYLOAD_FDT_PATH. This is because QEMU generates a device tree blob on the fly based on the command line parameters and it's compatible with the one used in the upstream Linux kernel. + +When U-Boot v2020.01 (or higher) is used as the payload, as the SiFive FU540 +DTB for the real hardware is embedded in U-Boot binary itself, due to the same +reason above, we need to switch the U-Boot sifive_fu540_defconfig configuration +from CONFIG_OF_SEPARATE to CONFIG_OF_PRIOR_STAGE so that U-Boot uses the DTB +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 +``` |