riscv: Ensure the kernel start address is correctly cast

Cast the kernel start address to the target bit length.

This ensures that we calculate the initrd offset to a valid address for
the architecture.

Steps to reproduce the original problem (reported by Alex):
  Build U-Boot for the virt machine for riscv32. Then run it with

    $ qemu-system-riscv32 -M virt -kernel u-boot -nographic -initrd <a file>

  You can find the initrd address with

    U-Boot# fdt addr $fdtcontroladdr
    U-Boot# fdt ls /chosen

  Then take a peek at that address:

    U-Boot# md.b <addr>

  and you will see that there is nothing there without this patch. The
  reason is that the binary was loaded to a negative address.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Suggested-by: Alexander Graf <agraf@suse.de>
Reported-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
index 3e8b19c..fc4c6b3 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -62,7 +62,7 @@ static const struct MemmapEntry {
     [VIRT_PCIE_ECAM] =   { 0x30000000,    0x10000000 },
 };
 
-static uint64_t load_kernel(const char *kernel_filename)
+static target_ulong load_kernel(const char *kernel_filename)
 {
     uint64_t kernel_entry, kernel_high;