[Qemu-devel] [6437] target-ppc: always load kernel to KERNEL_LOAD_ADDR

[Aurelien Jarno <aurelien@aurel32.net>]

Revision: 6437
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=6437
Author:   aurel32
Date:     2009-01-26 10:22:15 +0000 (Mon, 26 Jan 2009)

Log Message:
-----------
target-ppc: always load kernel to KERNEL_LOAD_ADDR

Linux changed its physical address location in the elf header from
0xc0000000 to 0 on 2.6.25, causing later kernels to fail booting
with the -kernel option.

This patch assures that the lowest segment in the elf binary is loaded
to KERNEL_LOAD_ADDR, which is where the firmware expects it.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

Modified Paths:
--------------
    trunk/hw/ppc_oldworld.c

Modified: trunk/hw/ppc_oldworld.c
===================================================================
--- trunk/hw/ppc_oldworld.c	2009-01-25 10:56:51 UTC (rev 6436)
+++ trunk/hw/ppc_oldworld.c	2009-01-26 10:22:15 UTC (rev 6437)
@@ -207,10 +207,16 @@
     }
 
     if (linux_boot) {
+        uint64_t lowaddr = 0;
         kernel_base = KERNEL_LOAD_ADDR;
-        /* now we can load the kernel */
-        kernel_size = load_elf(kernel_filename, kernel_base - 0xc0000000ULL,
-                               NULL, NULL, NULL);
+        /* Now we can load the kernel. The first step tries to load the kernel
+           supposing PhysAddr = 0x00000000. If that was wrong the kernel is
+           loaded again, the new PhysAddr being computed from lowaddr. */
+        kernel_size = load_elf(kernel_filename, kernel_base, NULL, &lowaddr, NULL);
+        if (kernel_size > 0 && lowaddr != KERNEL_LOAD_ADDR) {
+            kernel_size = load_elf(kernel_filename, (2 * kernel_base) - lowaddr,
+                                   NULL, 0, NULL);
+        }
         if (kernel_size < 0)
             kernel_size = load_aout(kernel_filename, kernel_base,
                                     ram_size - kernel_base);