Intel Extensible Firmware Interface Specification page 469

Sparse NvData CPB
typedef struct s_pxe_cpb_nvdata_sparse {
// NvData item list.
struct {
// Non-volatile storage address to be changed.
PXE_UINT32 Addr;
// Data item to write into above storage address.
union {
PXE_UINT8 Byte;
PXE_UINT16 Word;
PXE_UINT32 Dword;
} Data;
} Item[n];
} PXE_CPB_NVDATA_SPARSE;
Version 1.02
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12/12/00
32/64-bit UNDI Specification
451