The documentation for the generic loader claims that you can
set the PC for a CPU with an option of the form
  -device loader,cpu-num=0,addr=0x10000004

However if you try this QEMU complains:
  cpu_num must be specified when setting a program counter

This is because we were testing against 0 rather than CPU_NONE.

Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>
Reviewed-by: Alistair Francis <alistair.fran...@xilinx.com>
Reviewed-by: Philippe Mathieu-Daudé <f4...@amsat.org>
Message-id: 20180205150426.20542-1-peter.mayd...@linaro.org
---
 hw/core/generic-loader.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/core/generic-loader.c b/hw/core/generic-loader.c
index 46012673c3..cb0e68486d 100644
--- a/hw/core/generic-loader.c
+++ b/hw/core/generic-loader.c
@@ -105,7 +105,7 @@ static void generic_loader_realize(DeviceState *dev, Error 
**errp)
             error_setg(errp, "data can not be specified when setting a "
                        "program counter");
             return;
-        } else if (!s->cpu_num) {
+        } else if (s->cpu_num == CPU_NONE) {
             error_setg(errp, "cpu_num must be specified when setting a "
                        "program counter");
             return;
-- 
2.16.1


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