arm64: fix fvp smp faild to boot

reason:
we should give a busy wait addr

This commit fixes the regression from https://github.com/apache/nuttx/pull/13640

Signed-off-by: hujun5 <hujun5@xiaomi.com>

arch/arm64/src/common/arm64_cpustart.c

@@ -210,7 +210,7 @@ int up_cpu_start(int cpu)
 #ifdef CONFIG_ARM64_SMP_BUSY_WAIT
   uint32_t *address = (uint32_t *)CONFIG_ARM64_SMP_BUSY_WAIT_FLAG_ADDR;
   *address = 1;
-  up_flush_dcache((uintptr_t)address, sizeof(address));
+  up_flush_dcache((uintptr_t)address, (uintptr_t)address + sizeof(address));
 #endif
 
   arm64_start_cpu(cpu);

boards/arm64/fvp-v8r/fvp-armv8r/configs/nsh_smp/defconfig

@@ -14,6 +14,8 @@ CONFIG_ARCH_CHIP_FVP_ARMV8R=y
 CONFIG_ARCH_CHIP_FVP_R82=y
 CONFIG_ARCH_EARLY_PRINT=y
 CONFIG_ARCH_INTERRUPTSTACK=4096
+CONFIG_ARM64_SMP_BUSY_WAIT=y
+CONFIG_ARM64_SMP_BUSY_WAIT_FLAG_ADDR=0x60000
 CONFIG_ARM64_STRING_FUNCTION=y
 CONFIG_BUILTIN=y
 CONFIG_DEBUG_ASSERTIONS=y

boards/arm64/fvp-v8r/fvp-armv8r/scripts/dramboot.ld

@@ -18,6 +18,8 @@
  *
  ****************************************************************************/
 
+#include <nuttx/config.h>
+
 OUTPUT_ARCH(aarch64)
 
 ENTRY(__start)
@@ -93,6 +95,10 @@ SECTIONS
   } :text
   _edata = .; /* End+1 of .data */
 
+#if defined(CONFIG_SMP) && defined(CONFIG_ARM64_SMP_BUSY_WAIT)
+  . = CONFIG_ARM64_SMP_BUSY_WAIT_FLAG_ADDR + 4;
+#endif
+
   .bss : {                     /* BSS */
        . = ALIGN(8);
        _sbss = .;