Dell OEM Type 218: Dell Token Interface Guide

Access the Dell Token Interface command port, command classes, and token records.

Result set and ownership

lazybiosGetOemDellType218 returns a lazybiosOemDellType218Array_t holding every matching structure. Iterate entries using count. A non-NULL result whose count is zero means the table contains none of this type; NULL means the arguments were unusable or an allocation failed. Release the set with lazybiosFreeOemDellType218, or assign it to ctx->oem->dell->Type218 and let lazybiosCleanup own it.

Every record carries its own SMBIOS handle and the reported length.

Fields

• command_io_address: I/O port address used to issue token commands.
• command_io_code: Value written to the command port to trigger a command.
• supported_command_classes_bitmap: Bitmap of the command classes the firmware implements.
• tokens: Variable-length array of token records. Each record contains a token_id, a location, and a value, all 16-bit.

Check the corresponding field_status member before using each fixed field or the token array, and iterate tokens using token_count.

Token list and terminator

Token records are six bytes each and begin at offset 0x0B, so the encoded count is (length - 0x0B) / 6. The final record is normally a terminator rather than real data.

lazybios drops that trailing record only when it matches the terminator pattern, so a structure whose last record contains real data keeps it. This differs from dmidecode, which always drops the last record. On firmware that terminates its token list the two agree exactly; where they differ, lazybios reports the extra record.

See also

Dell OEM Type 218: Dell Token Interface

Dell OEM Type 212: Dell Indexed I/O Access Guide