PART_BOOT
#define PART_BOOT (2 * 1024 * 1024) /* 2MB boot partition */
#define PART_BOOT (5 * 1024 * 1024) /* 5MB boot partition */
#define PART_BOOT (16*MEG)
#define PART_BOOT (8*MEG)
#define PART_BOOT (8 * MEG) /* for a.out kernel and boot */
#define PART_BOOT FAT12_BOOT_SIZE
#define PART_BOOT PREP_BOOT_SIZE
#define PART_BOOT (4 * MEG) /* Enough for a GENERIC kernel */