--- mips/machdep.c	(revision 203318)
+++ mips/machdep.c	(local)
@@ -84,6 +84,7 @@
 #include <machine/cache.h>
 #include <machine/clock.h>
 #include <machine/cpu.h>
+#include <machine/elf.h>
 #include <machine/hwfunc.h>
 #include <machine/intr_machdep.h>
 #include <machine/md_var.h>
@@ -150,9 +151,18 @@
 extern char MipsCache[], MipsCacheEnd[];
 
 extern char edata[], end[];
+#ifdef DDB
+extern vm_offset_t ksym_start, ksym_end;
+#endif
 
 u_int32_t bootdev;
 struct bootinfo bootinfo;
+/*
+ * First kseg0 address available for use. By default it's equal to &end.
+ * But in some cases there might be additional data placed right after 
+ * _end by loader or ELF trampoline.
+ */
+vm_offset_t kernel_kseg0_end = (vm_offset_t)&end;
 
 static void
 cpu_startup(void *dummy)
@@ -360,6 +370,34 @@
 }
 
 /*
+ * Fix kernel_kseg0_end address in case trampoline placed debug sympols 
+ * data there
+ */
+void
+mips_postboot_fixup(void)
+{
+	vm_offset_t kernend;
+
+	/* clear the BSS and SBSS segments */
+	kernend = (vm_offset_t)&end;
+	memset(&edata, 0, kernend - (vm_offset_t)(&edata));
+
+#ifdef DDB
+	Elf_Size *trampoline_data = (Elf_Size*)kernel_kseg0_end;
+	Elf_Size symtabsize = 0;
+	if (trampoline_data[0] == SYMTAB_MAGIC) {
+		symtabsize = trampoline_data[1];
+		kernel_kseg0_end += 2 * sizeof(Elf_Size);
+		/* start of .symtab */
+		ksym_start = kernel_kseg0_end;
+		kernel_kseg0_end += symtabsize;
+		/* end of .strtab */
+		ksym_end = kernel_kseg0_end;
+	}
+#endif
+}
+
+/*
  * Initialise a struct pcpu.
  */
 void
--- atheros/ar71xx_machdep.c	(revision 203318)
+++ atheros/ar71xx_machdep.c	(local)
@@ -57,8 +57,6 @@
 
 #include <mips/atheros/ar71xxreg.h>
 
-extern int *edata;
-extern int *end;
 uint32_t ar711_base_mac[ETHER_ADDR_LEN];
 /* 4KB static data aread to keep a copy of the bootload env until
    the dynamic kenv is setup */
@@ -142,15 +140,12 @@
 platform_start(__register_t a0 __unused, __register_t a1 __unused, 
     __register_t a2 __unused, __register_t a3 __unused)
 {
-	vm_offset_t kernend;
 	uint64_t platform_counter_freq;
 	uint32_t reg;
 	int argc, i, count = 0;
 	char **argv, **envp;
 
-	/* clear the BSS and SBSS segments */
-	kernend = round_page((vm_offset_t)&end);
-	memset(&edata, 0, kernend - (vm_offset_t)(&edata));
+	mips_postboot_fixup();
 
 	/* Initialize pcpu stuff */
 	mips_pcpu0_init();
@@ -186,7 +181,7 @@
 		realmem = btoc(32*1024*1024);
 
 	/* phys_avail regions are in bytes */
-	phys_avail[0] = MIPS_KSEG0_TO_PHYS((vm_offset_t)&end);
+	phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
 	phys_avail[1] = ctob(realmem);
 
 	physmem = realmem;
--- include/md_var.h	(revision 203318)
+++ include/md_var.h	(local)
@@ -44,6 +44,7 @@
 extern	int	szsigcode, szosigcode;
 
 extern vm_offset_t kstack0;
+extern vm_offset_t kernel_kseg0_end;
 
 void	MipsSaveCurFPState(struct thread *);
 void	fork_trampoline(void);
@@ -68,6 +69,7 @@
 void	mips_cpu_init(void);
 void	mips_pcpu0_init(void);
 void	mips_proc0_init(void);
+void	mips_postboot_fixup(void);
 
 /* Platform call-downs. */
 void	platform_identify(void);