riscv: qemu-riscv.h: define CONFIG_PREBOOT (enables extlinux)
- Set fdt_addr variable, which is needed for extlinux to find FDT.
Otherwise booting kernel using extlinux results in missing FDT.
- Also run fdt addr with FDT address so that fdt commands would
work out of the box in U-Boot prompt.
This is successfully used by Fedora/RISCV with 5.1-rc3+ kernel using
OpenSBI -> U-Boot (S-mode) [extlinux] -> Kernel setup.
Signed-off-by: David Abdurachmanov <david.abdurachmanov@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/include/configs/qemu-riscv.h b/include/configs/qemu-riscv.h
index 22a5cd7..b7110ed 100644
--- a/include/configs/qemu-riscv.h
+++ b/include/configs/qemu-riscv.h
@@ -48,4 +48,8 @@
"ramdisk_addr_r=0x88300000\0" \
BOOTENV
+#define CONFIG_PREBOOT \
+ "setenv fdt_addr ${fdtcontroladdr};" \
+ "fdt addr ${fdtcontroladdr};"
+
#endif /* __CONFIG_H */