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| author | Bin Meng <bmeng.cn@gmail.com> | 2020-02-10 07:42:03 -0800 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2020-02-11 15:09:08 +0530 |
| commit | d6fa7f95bbcaa080810656c79e8879357b312280 (patch) | |
| tree | 49cd139f084ec0b5d2c896adf239be91e928c4a3 /docs/platform | |
| parent | 9a717ec12eeaa94e8781b0f196afd7fee19c9f63 (diff) | |
doc: sifive: fu540: Update QEMU instruction when using U-Boot as the payload
Document that when U-Boot v2020.01 (or higher) is used as the payload,
we need adjust the instructions a little bit when testing OpenSBI with
QEMU 'sifive_u' machine.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Diffstat (limited to 'docs/platform')
| -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 +``` |