VAX_BOOT_BLOCK_BLOCKSIZE
__CTASSERT(sizeof(bb)==VAX_BOOT_BLOCK_BLOCKSIZE);
if (bb.bb_id_offset*2 >= VAX_BOOT_BLOCK_BLOCKSIZE
char *bootstrapbuf, oldbb[VAX_BOOT_BLOCK_BLOCKSIZE];
__CTASSERT(sizeof(struct vax_boot_block) == VAX_BOOT_BLOCK_BLOCKSIZE);
VAX_BOOT_BLOCK_BLOCKSIZE);
*len = roundup(cc, VAX_BOOT_BLOCK_BLOCKSIZE);