riscv: qemu: detect and boot the kernel passed by QEMU
QEMU embeds the location of the kernel image in the device tree. Store
this address in the environment as variable kernel_start. It is used in
the board-local distro boot command QEMU to boot the kernel with the
U-Boot device tree. The QEMU boot command is added as the first boot
target device.
Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
diff --git a/board/emulation/qemu-riscv/qemu-riscv.c b/board/emulation/qemu-riscv/qemu-riscv.c
index 2ce093e..587f2c49 100644
--- a/board/emulation/qemu-riscv/qemu-riscv.c
+++ b/board/emulation/qemu-riscv/qemu-riscv.c
@@ -19,3 +19,32 @@
return 0;
}
+
+int board_late_init(void)
+{
+ ulong kernel_start;
+ ofnode chosen_node;
+ int ret;
+
+ chosen_node = ofnode_path("/chosen");
+ if (!ofnode_valid(chosen_node)) {
+ debug("No chosen node found, can't get kernel start address\n");
+ return 0;
+ }
+
+#ifdef CONFIG_ARCH_RV64I
+ ret = ofnode_read_u64(chosen_node, "riscv,kernel-start",
+ (u64 *)&kernel_start);
+#else
+ ret = ofnode_read_u32(chosen_node, "riscv,kernel-start",
+ (u32 *)&kernel_start);
+#endif
+ if (ret) {
+ debug("Can't find kernel start address in device tree\n");
+ return 0;
+ }
+
+ env_set_hex("kernel_start", kernel_start);
+
+ return 0;
+}