On Thu, Apr 11, 2019 at 2:41 PM Auer, Lukas lukas.auer@aisec.fraunhofer.de wrote:
- Bin
On Tue, 2019-04-09 at 12:42 +0200, David Abdurachmanov wrote:
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.
While often useful to have, the fdt command is not used during a normal boot. I think we should avoid calling commands, which are not normally needed. Can you remove this from your patch?
I borrowed idea from other boards, and I find it useful to have fdt working out-of-the-box without trying to figure the correct variable which holds address of FDT.
I can remove it from the patch, but I will probably keep adding it as Fedora specific patch then.
Thanks, Lukas
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
include/configs/qemu-riscv.h | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/include/configs/qemu-riscv.h b/include/configs/qemu-riscv.h index 22a5cd7365..b7110edebc 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 */