[Qemu-devel] [PATCH] vexpress: Add support for the -bios flag to provide firmware

[Grant Likely <grant.likely@linaro.org>]

Right now to run firmware inside the QEMU VExpress model requires
padding out the firmware image to the size of the virtual flash and
passing it in via the -pflash argument. If the firmware image is passed
without padding, then QEMU will fail. Also, when passed as a -pflash
argument, QEMU treats the file as persistent storage and will modify the
file.

The -bios flag provides the semantics that we want for providing a
firmware image. This patch maps the contents of the -bios file into the
address space at the boot flash location.

Tested with the vexpress-a15 model and the Tianocore port.

Signed-off-by: Grant Likely <grant.likely@linaro.org>
Tested-by: Roy Franz <roy.franz@linaro.org>
Cc: Peter Maydell <peter.maydell@linaro.org>
---
 hw/arm/vexpress.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/hw/arm/vexpress.c b/hw/arm/vexpress.c
index 67628af58840..80c549caa662 100644
--- a/hw/arm/vexpress.c
+++ b/hw/arm/vexpress.c
@@ -28,6 +28,7 @@
 #include "net/net.h"
 #include "sysemu/sysemu.h"
 #include "hw/boards.h"
+#include "hw/loader.h"
 #include "exec/address-spaces.h"
 #include "sysemu/blockdev.h"
 #include "hw/block/flash.h"
@@ -528,6 +529,17 @@ static void vexpress_common_init(VEDBoardInfo *daughterboard,
 
     daughterboard->init(daughterboard, args->ram_size, args->cpu_model, pic);
 
+    /*
+     * If a bios file was provided, attempt to map it into memory
+     */
+    if (bios_name) {
+        const char *fn = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+        if (!fn || load_image_targphys(fn, map[VE_NORFLASH0], VEXPRESS_FLASH_SIZE) < 0) {
+            error_report("Could not load rom image '%s'.\n", fn);
+            exit(0);
+        }
+    }
+
     /* Motherboard peripherals: the wiring is the same but the
      * addresses vary between the legacy and A-Series memory maps.
      */
-- 
1.8.3.2