riscv: add RISC-V fields to bdinfo command

The firmware invoking main U-Boot uses

* a0 to pass the boot hart
* a1 to pass a device-tree

Let the bdinfo command print this information, e.g.

    boot hart   = 0x000000000000001b
    firmware fdt= 0x0000000087e00000

The firmware fdt field will only be printed if it is non-zero.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>

arch/riscv/lib/Makefile

@@ -26,6 +26,7 @@ obj-y   += setjmp.o
 obj-$(CONFIG_$(SPL_)SMP) += smp.o
 obj-$(CONFIG_SPL_BUILD)	+= spl.o
 obj-y   += fdt_fixup.o
+obj-$(CONFIG_$(SPL)CMD_BDI) += bdinfo.o
 
 # For building EFI apps
 CFLAGS_NON_EFI := -fstack-protector-strong

arch/riscv/lib/bdinfo.c

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * RISC-V-specific information for the 'bdinfo' command
+ */
+
+#include <init.h>
+#include <asm/global_data.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void arch_print_bdinfo(void)
+{
+	bdinfo_print_num_l("boot hart", gd->arch.boot_hart);
+
+	if (gd->arch.firmware_fdt_addr)
+		bdinfo_print_num_ll("firmware fdt",
+				    (long long)gd->arch.firmware_fdt_addr);
+}