From mboxrd@z Thu Jan  1 00:00:00 1970
From: vijay.kilari@gmail.com (Vijay Kilari)
Date: Mon, 5 Aug 2013 17:42:17 +0530
Subject: Kexec: BE kernel on ARM VE TC2
Message-ID: <CALicx6ueLxCFCeun1grdtcC21HSkCDfenLWOSfuoSJnhx9GZ6w@mail.gmail.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Hi Will,

I am trying to make kexec work on BE kernel on ARM VE TC2.

First, to make KEXEC work with SMP on ARM VE TC2 board,
I set nr_cpus=2 (i.e boot only A15's) this works with LE kernel.

However, I made below changes to make KEXEC work for BE kernel.
my question is: why delay is required for board to reboot with kexec?.
Is it platform issue?.

diff --git a/arch/arm/kernel /machine_kexec.c b/arch/arm/kernel/machine_kexec.c
index 4fb074c..0fb0ff9 100644
--- a/arch/arm/kernel/machine_kexec.c
+++ b/arch/arm/kernel/machine_kexec.c
@@ -123,6 +123,18 @@ void machine_crash_shutdown(struct pt_regs *regs)
        printk(KERN_INFO "Loading crashdump kernel...\n");
 }

+static void byte_copy_relocate_kernel(void *dst, const void *src, int size)
+{
+        char *d, *s;
+        d = (char *) dst;
+        s = (char *) src;
+        while (size > 0)
+        {
+                *d++ = *s++;
+                size--;
+        }
+}
+
 /*
  * Function pointer to optional machine-specific reinitialization
  */
@@ -155,9 +167,8 @@ void machine_kexec(struct kimage *image)


        /* copy our kernel relocation code to the control code page */
-       memcpy(reboot_code_buffer,
-              relocate_new_kernel, relocate_new_kernel_size);
-
+       byte_copy_relocate_kernel(reboot_code_buffer,
+              relocate_new_kernel, relocate_new_kernel_size);

        flush_icache_range((unsigned long) reboot_code_buffer,
                           (unsigned long) reboot_code_buffer +
KEXEC_CONTROL_PAGE_SIZE);
@@ -165,6 +176,6 @@ void machine_kexec(struct kimage *image)

        if (kexec_reinit)
                kexec_reinit();
-
+       mdelay(500);
        soft_restart(reboot_code_buffer_phys);
 }


Thanks & Regards
Vijay