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[PULL,22/23] hw/arm/boot: load device tree to base of DRAM if no -kernel option was passed

Message ID 1410528234-13545-23-git-send-email-peter.maydell@linaro.org
State Accepted
Commit 69e7f76f6a1ed8fe13602c8b5f51cdb6ce3a3981
Headers show

Commit Message

Peter Maydell Sept. 12, 2014, 1:23 p.m. UTC 
From: Ard Biesheuvel <ard.biesheuvel@linaro.org>

If we are running the 'virt' machine, we may have a device tree blob but no
kernel to supply it to if no -kernel option was passed. In that case, copy it
to the base of RAM where it can be picked up by a bootloader.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Message-id: 1410453915-9344-4-git-send-email-ard.biesheuvel@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/arm/boot.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
diff mbox

Patch

diff --git a/hw/arm/boot.c b/hw/arm/boot.c
index 2083aeb..1bed02d 100644
--- a/hw/arm/boot.c
+++ b/hw/arm/boot.c
@@ -490,6 +490,16 @@  void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info)
 
     /* Load the kernel.  */
     if (!info->kernel_filename) {
+
+        if (have_dtb(info)) {
+            /* If we have a device tree blob, but no kernel to supply it to,
+             * copy it to the base of RAM for a bootloader to pick up.
+             */
+            if (load_dtb(info->loader_start, info, 0) < 0) {
+                exit(1);
+            }
+        }
+
         /* If no kernel specified, do nothing; we will start from address 0
          * (typically a boot ROM image) in the same way as hardware.
          */