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.