2012-11-25 22:57:04 +01:00
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Dumping the firmware:
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2007-04-20 18:20:22 +02:00
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This technique consists on reconstructing a firmware image dumping
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pieces at certains offsets of the device internal memory.
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2012-11-25 22:57:04 +01:00
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Technical details:
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2007-04-20 18:20:22 +02:00
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2007-04-20 21:00:12 +02:00
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* The internal flash memory is exposed to the system as MTD devices.
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* Is possible to dump the individual sections of a flashed firmware.
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2007-04-20 18:20:22 +02:00
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*
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2012-11-25 22:57:04 +01:00
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* READ src/local.c for detailed information.
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2007-04-20 18:20:22 +02:00
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mtd0 - contains xloader and sencodary pieces of the bootloaders
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0x00000 - xloader.bin (size is 0x03600)
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0x04000 - secondary.bin (size is 0x15400)
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0x1FFFF - eof
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mtd1 - looks like there's a pool ConF structures
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mtd2 - starts with NOLO img\x5c\x13 and \x00 padding
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0x00800 - zImage
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2007-04-20 21:00:12 +02:00
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> NOLO is a four byte marker, next four bytes
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> can vary since it is kernel image size
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mtd3 - initfs.jffs2 (2M) aka 0x200000 vs 0x3900000
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2007-04-20 18:20:22 +02:00
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mtd4 - rootfs.jffs2 (a fucking copy of the above rootfs?)
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2007-06-10 16:15:30 +02:00
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// Extra notes //
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[MTD] NAND Consolidate oobinfo handling
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The info structure for out of band data was copied into
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the mtd structure. Make it a pointer and remove the ability
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to set it from userspace. The position of ecc bytes is
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defined by the hardware and should not be changed by software.
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// The oob stuff
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In mtd3 the OOB data is 64 bytes aka 0x40, and this oob stuff
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appears every 2KB aka 0x800 bytes.
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/*
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* Obsolete legacy interface. Keep it in order not to break userspace
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* interfaces
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*/
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struct nand_oobinfo {
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uint32_t useecc;
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uint32_t eccbytes;
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uint32_t oobfree[8][2];
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uint32_t eccpos[32];
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};
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