ENGR00174536-1 booti: add booti command support.

Support booti command which can boot from a boot.img
boot.img is a zImage + ramdisk.img + bootargs + boot addr
which include these info can be used to avoid mis match between
kernel and ramdisk, also can avoid commit to chagne default
bootargs.

For example:
> booti mmc1
command will read the boot.img from 1M offset,
and then parser the bootargs and ramdisk
then do the boot from that zImage.
> booti mmc1 recovery
will going to read the recovery's partition no
and offset and boot from recovery image.
this recovery image also a zImage + ramdisk

bootargs:
if uboot have define a env var 'bootargs', booti command
will use this bootargs as kernel cmdline

if you want use boot.img 's bootargs, just type:
> setenv bootargs
in uboot to clear the bootargs in uboot env.
our default uboot env will be NULL in config file.

also, android use boot.img to support OTA.

Signed-off-by: Zhang Jiejing <jiejing.zhang@freescale.com>

1 files changed, 107 insertions, 0 deletions

diff --git a/include/bootimg.h b/include/bootimg.h
new file mode 100644
index 0000000..5f64bc6
--- /dev/null
+++ b/include/bootimg.h
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _BOOT_IMAGE_H_
+#define _BOOT_IMAGE_H_
+
+typedef struct boot_img_hdr boot_img_hdr;
+
+#define BOOT_MAGIC "ANDROID!"
+#define BOOT_MAGIC_SIZE 8
+#define BOOT_NAME_SIZE 16
+#define BOOT_ARGS_SIZE 512
+
+struct boot_img_hdr {
+    unsigned char magic[BOOT_MAGIC_SIZE];
+
+    unsigned kernel_size;  /* size in bytes */
+    unsigned kernel_addr;  /* physical load addr */
+
+    unsigned ramdisk_size; /* size in bytes */
+    unsigned ramdisk_addr; /* physical load addr */
+
+    unsigned second_size;  /* size in bytes */
+    unsigned second_addr;  /* physical load addr */
+
+    unsigned tags_addr;    /* physical addr for kernel tags */
+    unsigned page_size;    /* flash page size we assume */
+    unsigned unused[2];    /* future expansion: should be 0 */
+
+    unsigned char name[BOOT_NAME_SIZE]; /* asciiz product name */
+
+    unsigned char cmdline[BOOT_ARGS_SIZE];
+
+    unsigned id[8]; /* timestamp / checksum / sha1 / etc */
+};
+
+/*
+** +-----------------+
+** | boot header     | 1 page
+** +-----------------+
+** | kernel          | n pages
+** +-----------------+
+** | ramdisk         | m pages
+** +-----------------+
+** | second stage    | o pages
+** +-----------------+
+**
+** n = (kernel_size + page_size - 1) / page_size
+** m = (ramdisk_size + page_size - 1) / page_size
+** o = (second_size + page_size - 1) / page_size
+**
+** 0. all entities are page_size aligned in flash
+** 1. kernel and ramdisk are required (size != 0)
+** 2. second is optional (second_size == 0 -> no second)
+** 3. load each element (kernel, ramdisk, second) at
+**    the specified physical address (kernel_addr, etc)
+** 4. prepare tags at tag_addr.  kernel_args[] is
+**    appended to the kernel commandline in the tags.
+** 5. r0 = 0, r1 = MACHINE_TYPE, r2 = tags_addr
+** 6. if second_size != 0: jump to second_addr
+**    else: jump to kernel_addr
+*/
+
+#if 0
+typedef struct ptentry ptentry;
+
+struct ptentry {
+    char name[16];      /* asciiz partition name    */
+    unsigned start;     /* starting block number    */
+    unsigned length;    /* length in blocks         */
+    unsigned flags;     /* set to zero              */
+};
+
+/* MSM Partition Table ATAG
+**
+** length: 2 + 7 * n
+** atag:   0x4d534d70
+**         <ptentry> x n
+*/
+#endif
+
+#endif