NVRAM

The NVRAM section of the flash has the following layout:

Magic:      0x4d52564e 'NVRM' Version:    0x00000001 Header size: 0x00001000 including magic, version, size and crc Header CRC: 0x???????? the CRC is computed on all the header treating the 4 CRC bytes as zeroes

each entry in the NVRAM header has the following layout:

Magic:      0x31434f54 'TOC1' Offset:     0x???????? offset of the content of the entry, starting from 0 at the NVRAM header Size:       0x???????? size in bytes of the entry Version:    0x00000001 Name:       up to 16 bytes, zero padded name of the entry.

The following entries are present:

envelope: contains all the NVRAM data. env:     contains the environment variables (stored as name and values in zero terminated strings) tokens:  contains the Tokens area logo-boot, logo-chg, logo-badchg, logo-nobatt, logo-badsys, logo-nosys, logo-panic, logo-disk: bitmap images

The CRC polynomial is 0xedb88320.