Modifying the kernel_utility tool to create our magic blob.

src/platform/vboot_reference/vkernel/include/kernel_blob.h

+// Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Constants describing the kernel blob content.
+
+#ifndef VBOOT_REFERENCE_KERNEL_BLOB_H_
+#define VBOOT_REFERENCE_KERNEL_BLOB_H_
+
+
+// Maximum kernel command-line size
+#define CROS_CONFIG_SIZE 4096
+
+// Size of the x86 zeropage table
+#define CROS_PARAMS_SIZE 4096
+
+// Alignment of various chunks within the kernel blob
+#define CROS_ALIGN 4096
+
+// RAM address where the 32-bit kernel expects to be started
+#define CROS_32BIT_ENTRY_ADDR  0x100000
+
+// Simplified version of the vmlinuz file header
+struct linux_kernel_header
+{
+  uint8_t  pad0[0x01f1 - 0x0];
+  uint8_t  setup_sects;                 // 1f1
+  uint8_t  pad1[0x0230 - 0x1f2];
+} __attribute__ ((packed));
+
+
+// Simplified version of the x86 kernel zeropage table
+struct linux_kernel_params
+{
+  uint8_t  pad0[0x01f1 - 0x0];
+  uint8_t  setup_sects;                 // 1f1
+  uint8_t  pad1[0x1fe - 0x1f2];
+  uint16_t boot_flag;                   // 1fe
+  uint8_t  pad2[0x210 - 0x200];
+  uint8_t  type_of_loader;              // 210
+  uint8_t  pad3[0x218 - 0x211];
+  uint32_t ramdisk_image;               // 218
+  uint32_t ramdisk_size;                // 21c
+  uint8_t  pad4[0x228 - 0x220];
+  uint32_t cmd_line_ptr;                // 228
+  uint8_t  pad5[0x0cd0 - 0x22c];
+} __attribute__ ((packed));
+
+
+#endif  // VBOOT_REFERENCE_KERNEL_BLOB_H_