SGI_BOOT_BLOCK_MAGIC
if (vh->magic != SGI_BOOT_BLOCK_MAGIC)
if (be32toh(slp->magic) != SGI_BOOT_BLOCK_MAGIC)
if (vh->magic != SGI_BOOT_BLOCK_MAGIC || mipsvh_cksum(vh) != 0) {
vh->magic = SGI_BOOT_BLOCK_MAGIC;
if (be32toh(volhdr->magic) != SGI_BOOT_BLOCK_MAGIC)
volhdr->magic = htobe32(SGI_BOOT_BLOCK_MAGIC);