--- /dev/null   2015-06-10 22:09:58.297974446 +0200
+++ linux-4.0.5/include/misc/sunxi_sid.h    2015-06-17 13:27:01.572876169 +0200
@@ -0,0 +1,19 @@
+#ifndef _MISC_SUNXI_H
+#define _MISC_SUNXI_H
+
+#include <linux/types.h>
+
+/* This enables drivers/misc/eeprom/sunxi_sid.c to provide a chip ID
+ * for supported sunxi platforms. It gets set to the 16-byte "root"
+ * SID present on most Allwinner SoCs.
+ * The c_show() function in arch/arm/kernel/setup.c may display this
+ * chip_id as part of the /proc/cpuinfo information.
+ */
+
+typedef u32 chip_id_t[4];
+
+#if defined(CONFIG_EEPROM_SUNXI_SID)
+   extern chip_id_t chip_id;
+#endif
+
+#endif
--- linux-4.0.5.orig/drivers/misc/eeprom/sunxi_sid.c    2015-06-06 17:21:22.000000000 +0200
+++ linux-4.0.5/drivers/misc/eeprom/sunxi_sid.c 2015-06-17 12:25:15.369171717 +0200
@@ -33,6 +33,8 @@
 #include <linux/sysfs.h>
 #include <linux/types.h>

+#include <misc/sunxi_sid.h>
+
 #define DRV_NAME "sunxi-sid"

 struct sunxi_sid_data {
@@ -40,6 +42,9 @@
    unsigned int keysize;
 };

+// variable to hold chip ID. gets initialized once in sunxi_sid_probe()
+chip_id_t chip_id = {0};
+
 /* We read the entire key, due to a 32 bit read alignment requirement. Since we
  * want to return the requested byte, this results in somewhat slower code and
  * uses 4 times more reads as needed but keeps code simpler. Since the SID is
@@ -130,6 +135,12 @@
    if (device_create_bin_file(&pdev->dev, &sid_bin_attr))
        return -ENODEV;

+   // initialize chip_id from "root" key (first 16 SID bytes)
+   chip_id[0] = ioread32(sid_data->reg_base + 0);
+   chip_id[1] = ioread32(sid_data->reg_base + 4);
+   chip_id[2] = ioread32(sid_data->reg_base + 8);
+   chip_id[3] = ioread32(sid_data->reg_base + 12);
+
    entropy = kzalloc(sizeof(u8) * sid_data->keysize, GFP_KERNEL);
    for (i = 0; i < sid_data->keysize; i++)
        entropy[i] = sunxi_sid_read_byte(sid_data, i);
--- linux-4.0.5.orig/arch/arm/kernel/setup.c    2015-06-06 17:21:22.000000000 +0200
+++ linux-4.0.5/arch/arm/kernel/setup.c 2015-06-17 11:55:49.842106578 +0200
@@ -58,6 +58,7 @@
 #include <asm/memblock.h>
 #include <asm/virt.h>

+#include <misc/sunxi_sid.h>
 #include "atags.h"


@@ -1094,6 +1095,12 @@
    seq_printf(m, "Serial\t\t: %08x%08x\n",
           system_serial_high, system_serial_low);

+#if defined(CONFIG_EEPROM_SUNXI_SID)
+   if (chip_id[0] != 0)
+       seq_printf(m, "Chipid\t\t: %08x-%08x-%08x-%08x\n",
+           chip_id[0], chip_id[1], chip_id[2], chip_id[3]);
+#endif
+
    return 0;
 }