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This scripts creates custom kernel header that necessary for Sercomm
mt7621 devices:
- Sercomm S3
- Beeline SmartBox Giga
- Beeline SmartBox Pro
- Beeline Smartbox Turbo
- Beeline Smartbox Turbo+
- WiFire S1500.NBN
Header format
-------------
+--------+---------------+------------------------+
| Offset | Value | Description |
+========+===============+========================+
| 0x0 | 53 65 72 00 | Magic "Ser." |
+--------+---------------+------------------------+
| 0x4 | 04 00 00 01 | End offset of RootFS |
+--------+---------------+------------------------+
| | | This header checksum |
| 0x8 | d6 14 9a c1 | htonl(~crc) |
+--------+---------------+------------------------+
| 0xc | 02 ff ff ff | Constant |
+--------+---------------+------------------------+
| 0x10 | 00 01 40 00 | Kernel start offset |
+--------+---------------+------------------------+
| 0x14 | c6 94 24 00 | Kernel length |
+--------+---------------+------------------------+
| | | Kernel checksum |
| 0x18 | e7 78 89 f1 | htonl(~crc) |
+--------+---------------+------------------------+
| 0x1c | 00 00 00 00 | Constant |
+--------+---------------+------------------------+
| 0x20 | ff ff ff ff | Constant |
+--------+---------------+------------------------+
| 0x24 | ff ff ff ff | Constant |
+--------+---------------+------------------------+
| 0x28 | 00 00 00 01 | RootFS offset |
+--------+---------------+------------------------+
| | | RootFS length |
| 0x2c | 04 00 00 00 | Always 0x4, we check |
| | | UBI magic only |
+--------+---------------+------------------------+
| | | RootFS checksum |
| 0x30 | 1c fc 55 2d | htonl(~crc) |
| | | Const for UBI magic |
+--------+---------------+------------------------+
| 0x34 | 00 00 00 00 | Constant |
+--------+---------------+------------------------+
| 0x38 | ff ff ff ff … | Pad to 0x100 |
+--------+---------------+------------------------+
Signed-off-by: Mikhail Zhilkin <csharper2005@gmail.com>
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